Preprints
"Microwave Hall measurements using a circularly polarized dielectric cavity", M. Roppongi, T. Arakawa, Y. Yoshino, K. Ishihara, Y. Kinoshita, M. Tokunaga, Y. Matsuda, K. Hashimoto, and T. Shibauchi (submitted); arXiv:2404.09662.
"Two-step growth of high-quality single crystals of the Kitaev magnet α-RuCl3", R. Namba, K. Imamura, R. Ishioka, K. Ishihara, T. Miyamoto, H. Okamoto, Y. Shimizu, Y. Saito, Y. Agarmani, M. Lang, H. Murayama, Y. Xing, S. Suetsugu, Y. Kasahara, Y. Matsuda, K. Hashimoto, and T. Shibauchi (submitted); arXiv:2402.03986.
"Lifting of gap nodes by disorder in ultranodal superconductor candidate FeSe1-xSx", T. Nagashima, K. Ishihara, K. Imamura, M. Kobayashi, M. Roppongi, K. Matsuura, Y. Mizukami, R. Grasset, M. Konczykowski, K. Hashimoto, and T. Shibauchi (submitted).
"Anomalous spatial oscillations in a monolayer Kitaev quantum spin liquid candidate", Y. Kohsaka, S. Akutagawa, S. Omachi, Y. Iwamichi, T. Ono, I. Tanaka, S. Tateishi, H. Murayama, S. Suetsugu, K. Hashimoto, T. Shibauchi, M. O. Takahashi, M. G. Yamada, S. Nikolaev, T. Mizushima, S. Fujimoto, T. Terashima, T. Asaba, Y. Kasahara, and Y. Matsuda (submitted).
"Discovery of nematic Bogoliubov Fermi surface in an iron-chalcogenide superconductor", T. Nagashima, T. Hashimoto, S. Najafzadeh, S. Ouchi, T. Suzuki, A. Fukushima, S. Kasahara, K. Matsuura, M. Qiu, Y. Mizukami, K. Hashimoto, Y. Matsuda, T. Shibauchi, S. Shin, and K. Okazaki (submitted).
"Thermodynamic signatures of diagonal nematicity in RbFe2As2 superconductor", Y. Mizukami, O. Tanaka, K. Ishida, M. Tsujii, T. Mitsui, S. Kitao, M. Kurokuzu, M. Seto, S. Ishida, A. Iyo, H. Eisaki, K. Hashimoto, and T. Shibauchi (submitted); arXiv:2108.13081.
2024
"Compensated ferrimagnets with colossal spin splitting in organic compounds",
T. Kawamura, K. Yoshimi, K. Hashimoto, A. Kobayashi, and T. Misawa,
Phys. Rev. Lett. 132, 156502 (2024); arXiv:2312.00367.
"Combined experimental and theoretical studies on glasslike transitions in the frustrated molecular conductors θ-(BEDT-TTF)2MM′(SCN)4",
Y. Saito, O. Ganter, C. Shang, K. Hashimoto, T. Sasaki, S. M. Winter, J. Müller, and M. Lang,
Phys. Rev. Research 6, 023003 (2024); arXiv:2310.16637.
"Scaling of Defect-Induced Low-Energy Majorana Excitations in the Kitaev Magnet α-RuCl3",
K. Imamura, Y. Mizukami, O. Tanaka, R. Grasset, M. Konczykowski, N. Kurita, H. Tanaka, Y. Matsuda, M. G. Yamada, K. Hashimoto, and T. Shibauchi,
Phys. Rev. X 14, 011045; arXiv:2306.17380.
"Majorana-Fermion origin of the planar thermal Hall effect in the Kitaev magnet α-RuCl3",
K. Imamura, S. Suetsugu, Y. Mizukami, Y. Yoshida, K. Hashimoto, K. Ohtsuka, Y. Kasahara, N. Kurita, H. Tanaka, P. Noh, J. Nasu, E.-G. Moon, Y. Matsuda, and T. Shibauchi,
Science Advances 10, eadk3539 (2024); arXiv:2305.10619.
"Evidence for an odd-parity nematic phase above the charge density wave transition in kagome metal CsV3Sb5",
T. Asaba, A. Onishi, Y. Kageyama, T. Kiyosue, K. Ohtsuka, S. Suetsugu, Y. Kohsaka, T. Gaggl, Y. Kasahara, H. Murayama, K. Hashimoto, R. Tazai, H. Kontani, B. R. Ortiz, S. D. Wilson, Q. Li, H.-H. Wen, T. Shibauchi, and Y. Matsuda,
Nature Physics 20, 40 (2024); arXiv:2309.16985.
2023
"Chiral superconductivity in UTe2 probed by anisotropic low-energy excitations",
K. Ishihara, M. Roppongi, M. Kobayashi, Y. Mizukami, H. Sakai, Y. Haga, K. Hashimoto, and T. Shibauchi,
Nature Communications 14, 2966 (2023); arXiv:2105.13721.
"Two superconducting states with time-reversal symmetry breaking in FeSe1-xSx",
K. Matsuura, M. Roppongi, M. Qiu, Q. Sheng, Y. P. Cai, K. Yamakawa, Z. Guguchia, R. P. Day, K. M. Kojima, A. Damascelli, Y. Sugimura, M. Saito, T. Takenaka, K. Ishihara, Y. Mizukami, K. Hashimoto, Y. Gu, S. L. Guo, L. C. Fu, Z. Zhang, F. L. Ning, G. Q. Zhao, G. Y. Dai, C. Q. Jin, J. W. Beare, G. M. Luke, Y. J. Uemura, and T. Shibauchi,
Proc. Natl. Acad. Sci. USA 120, e2208276120 (2023); arXiv:2304.03409.
"Anisotropic enhancement of lower critical field in ultraclean crystals of spin-triplet superconductor UTe2",
K. Ishihara, M. Kobayashi, K. Imamura, M. Konczykowski, H. Sakai, P. Opletal, Y. Tokiwa, Y. Haga, K. Hashimoto, and T. Shibauchi,
Phys. Rev. Res. 5, L022002 (2023); arXiv:2301.04801.
"Double dome structure of the Bose–Einstein condensation in diluted S = 3/2 quantum magnets",
Y. Watanabe, A. Miyake, M. Gen, Y. Mizukami, K. Hashimoto, T. Shibauchi, A. Ikeda, M. Tokunaga, T. Kurumaji, Y. Tokunaga, and T. Arima,
Nature Communications 14, 1260 (2023).
"Bulk evidence of anisotropic s-wave pairing with no sign change in the kagome superconductor CsV3Sb5",
M. Roppongi, K. Ishihara, Y. Tanaka, K. Ogawa, K. Okada, S. Liu, K. Mukasa, Y. Mizukami, Y. Uwatoko, R. Grasset, M. Konczykowski, B. R. Ortiz, S. D. Wilson, K. Hashimoto, and T. Shibauchi,
Nature Communications 14, 667 (2023); arXiv:2206.02580.
2022
"Optical conductivity spectra of charge-crystal and charge-glass states in a series of θ-type BEDT-TTF compounds",
K. Hashimoto, R. Kobayashi, S. Ohkura, S. Sasaki, N. Yoneyama, M. Suda, H. M. Yamamoto, and T. Sasaki,
"Comparison of the charge-crystal and charge-glass state in geometrically frustrated organic conductors studied by fluctuation spectroscopy",
T. Thomas, T. Thyzel, H. Sun, J. Müller, K. Hashimoto, T. Sasaki, and H. M. Yamamoto,
Phys. Rev. B 105, 205111 (2022); arXiv:2202.05602.
"Pure nematic quantum critical point accompanied by a superconducting dome",
K. Ishida, Y. Onishi, M. Tsujii, K. Mukasa, M. Qiu, M. Saito, Y. Sugimura, K. Matsuura, Y. Mizukami, K. Hashimoto, and T. Shibauchi,
Proc. Natl. Acad. Sci. USA 119, e2110501119 (2022); arXiv:2202.11674.
"Thermodynamic evidence for field-angle dependent Majorana gap in a Kitaev spin liquid",
O. Tanaka, Y. Mizukami, R. Harasawa, K. Hashimoto, N. Kurita, H. Tanaka, S. Fujimoto, Y. Matsuda, E.-G. Moon, and T. Shibauchi,
Nature Physics 18, 429–435 (2022); arXiv:2007.06757.
"Involvement of structural dynamics in the charge-glass formation in molecular metals",
T. Thomas, Y. Saito, Y. Agarmani, T. Thyzel, K. Hashimoto, T. Sasaki, M. Lang, and J. Müller,
Phys. Rev. B 105, L041114 (2022); arXiv:2109.00811.
2021
"Mixed-parity singlet-septet pairing state in a half-Heusler superconductor",
K. Ishihara, T. Takenaka, Y. Miao, Y. Mizukami, K. Hashimoto, M. Yamashita, M. Konczykowski, R. Masuki, M. Hirayama, T. Nomoto, R. Arita, O. Pavlosiuk, P. Wisniewski, D. Kaczorowski, and T. Shibauchi,
Phys. Rev. X 11, 041048 (2021); arXiv:2110.01819.
"Magnetic torque due to anisotropic diamagnetism in neutral BEDT-TTF crystals",
S. Uji, T. Terashima, S. Sugiura, S. Iguchi, T. Sasaki, K. Hashimoto, M. Shimozawa, N. Yoneyama, and R. Kato,
J. Phys. Soc. Jpn. 90, 113708 (2021).
"Strongly correlated superconductivity in a copper-based metal-organic framework with a perfect kagome lattice",
T. Takenaka*, K. Ishihara*, M. Roppongi, Y. Miao, Y. Mizukami, T. Makita, J. Tsurumi, S. Watanabe, J. Takeya, M. Yamashita, K. Torizuka, Y. Uwatoko, T. Sasaki, X. Huang, W. Xu, D. Zhu, N. Su, J.-G. Cheng, T. Shibauchi, and K. Hashimoto (*These authors contributed equally to this work),
Science Advances 7, eabf3996 (2021); arXiv:2103.15607.
"High-pressure phase diagrams of FeSe1-xTex: correlation between suppressed nematicity and enhanced superconductivity",
K. Mukasa, K. Matsuura, M. Qiu, M. Saito, Y. Sugimura, K. Ishida, M. Otani, Y. Onishi, Y. Mizukami, K. Hashimoto, J. Gouchi, R. Kumai, Y. Uwatoko, and T. Shibauchi,
Nature Communications 12, 381 (2021).
2020
"Signature of band inversion in the perovskite thin-film alloys BaSn1-xPbxO3",
J. Shiogai, T. Chida, K. Hashimoto, K. Fujiwara, T. Sasaki, and A. Tsukazaki,
Phys. Rev. B 101, 125125 (2020); arXiv:2003.07181.
Organic conductors
1. "Strongly correlated superconductivity in a copper-based metal-organic framework with a perfect kagome lattice",
T. Takenaka*, K. Ishihara*, M. Roppongi, Y. Miao, Y. Mizukami, T. Makita, J. Tsurumi, S. Watanabe, J. Takeya, M. Yamashita, K. Torizuka, Y. Uwatoko, T. Sasaki, X. Huang, W. Xu, D. Zhu, N. Su, J.-G. Cheng, T. Shibauchi, and K. Hashimoto (*These authors contributed equally to this work)
Science Advances 7, eabf3996 (2021).
2. "Crystallization and vitrification of electrons in a glass-forming charge liquid",
S. Sasaki*, K. Hashimoto*, R. Kobayashi, K. Itoh, S. Iguchi, Y. Nishio, Y. Ikemoto, T. Moriwaki, N. Yoneyama, M. Watanabe, A. Ueda, H. Mori, K. Kobayashi, R. Kumai, Y. Murakami, J. Muller, and T. Sasaki, (*These authors contributed equally to this work)
3. "Quantum-disordered state of magnetic and electric dipoles in an organic Mott system",
M. Shimozawa*, K. Hashimoto*, A. Ueda, Y. Suzuki, K. Sugii, S. Yamada, Y. Imai, R. Kobayashi, K. Itoh, S. Iguchi, M. Naka, S. Ishihara, H. Mori, T. Sasaki, and M. Yamashita, (*These authors contributed equally to this work)
Nature Communications 8, 1821 (2017).
4. "Dimer-Mott and charge-ordered insulating states in the quasi-one-dimensional organic conductors δ′P- and δ′C-(BPDT-TTF)2ICl2",
R. Kobayashi, K. Hashimoto, N. Yoneyama, K. Yoshimi, Y. Motoyama, S. Iguchi, Y. Ikemoto, T. Moriwaki, H. Taniguchi, and T. Sasaki,
Phys. Rev. B 96, 115112 (2017).
5. "Emergence of charge degrees of freedom under high pressure in the organic dimer-Mott insulator β'-(BEDT-TTF)2ICl2"
K. Hashimoto, R. Kobayashi, H. Okamura, H. Taniguchi, Y. Ikemoto, T. Moriwaki, S. Iguchi, M. Naka, S. Ishihara and T. Sasaki,
Phys. Rev. B 92, 085149 (2015).
6. "Collective excitation of a short-range charge ordering in θ-(BEDT-TTF)2CsZn(SCN)4"
K. Hashimoto, S. C. Zhan, R. Kobayashi, S. Iguchi, N. Yoneyama, T. Moriwaki, Y. Ikemoto, and T. Sasaki,
Phys. Rev. B 89, 085107 (2014).
Quantum critical behaviors
1. "Anomalous superfluid density in quantum critical superconductors",
K. Hashimoto, Y. Mizukami, R. Katsumata, H. Shishido, M. Yamashita, H. Ikeda, Y. Matsud, J. A. Schlueter, J. D. Fletcher, A. Carrington, D. Gnida, D. Kaczorowski, and T. Shibauchi,
2. "A aharp peak of the zero-temperature penetration depth at optimal composition in BaFe2(As1-xPx)2",
K. Hashimoto, K. Cho, T. Shibauchi, S. Kasahara, Y. Mizukami, R. Katsumata, Y. Tsuruhara, T. Terashima, H. Ikeda, M. A. Tanatar, H. Kitano, N. Salovich, R. W. Giannetta, P. Walmsley, A. Carrington, R. Prozorov, and Y. Matsuda,
Science 336, 1554-1557 (2012).
Iron-based superconductors
1. "High-pressure phase diagrams of FeSe1-xTex: correlation between suppressed nematicity and enhanced superconductivity",
K. Mukasa, K. Matsuura, M. Qiu, M. Saito, Y. Sugimura, K. Ishida, M. Otani, Y. Onishi, Y. Mizukami, K. Hashimoto, J. Gouchi, R. Kumai, Y. Uwatoko, and T. Shibauchi,
Nature Communications 12, 381 (2021).
2. "Disorder-induced topological change of the superconducting gap structure in iron pnictides",
Y. Mizukami, M. Konczykowski, Y. Kawamoto, S. Kurata, S. Kasahara, K. Hashimoto, V. Mishra, A. Kreisel, Y. Wang, P. J. Hirschfeld, Y. Matsuda, and T. Shibauchi,
Nature Communications 5, 5657 (2014).
3. "Electronic nematicity above the structural and superconducting transition in BaFe2(As1-xPx)2",
S. Kasahara, H. J. Shi, K. Hashimoto, S. Tonegawa, Y. Mizukami, T. Shibauchi, K. Sugimoto, T. Fukuda, T. Terashima, Andriy H. Nevidomskyy, and Y. Matsuda,
4. "Octet-Line Node Structure of Superconducting Order Parameter in KFe2As2",
K. Okazaki, Y. Ota, Y. Kotani, W. Malaeb, Y. Ishida, T. Shimojima, T. Kiss, S. Watanabe, C.-T. Chen, K. Kihou, C. H. Lee, A. Iyo, H. Eisaki, T. Saito, H. Fukazawa, Y. Kohori, K. Hashimoto, T. Shibauchi, Y. Matsuda, H. Ikeda, H. Miyahara, R. Arita, A. Chainani, and S. Shin,
Science 337, 1314-1317 (2012).
5. "Nodal versus nodeless order parameters in LiFeP and LiFeAs superconductors",
K. Hashimoto, S. Kasahara, R. Katsumata, Y. Mizukami, M. Yamashita, H. Ikeda, T. Terashima, A. Carrington, Y. Matsuda, and T. Shibauch,
Phys. Rev. Lett. 108, 047003 (2012).
6. "Line Nodes in the Energy Gap of Superconducting BaFe2(As1-xPx)2",
K. Hashimoto, M. Yamashita, S. Kasahara, Y. Senshu, N. Nakata, S. Tonegawa, K. Ikada, A. Serafin, A. Carrington, T. Terashima, H. Ikeda, T. Shibauchi, and Y. Matsuda,
Phys. Rev. B 81, 220501(R) (2010).
7. "Microwave Surface-Impedance Measurements of the Magnetic Penetration Depth in Single Crystal Ba1-xKxFe2As2 Superconductors: Evidence for a Disorder-Dependent Superfluid Density",
K. Hashimoto, T. Shibauchi, S. Kasahara, K. Ikada, S. Tonegawa, T. Kato, R. Okazaki, C. J. van der Beek, M. Konczykowski, H. Takeya, K. Hirata, T. Terashima, and Y. Matsuda,
Phys. Rev. Lett. 102, 207001 (2009).
8. "Microwave Penetration Depth and Quasiparticle Conductivity of PrFeAsO1-y Single Crystals: Evidence for a Full-Gap Superconductor",
K. Hashimoto, T. Shibauchi, T. Kato, R. Okazaki, H. Shishido, M. Ishikado, H. Kito, A. Iyo, H. Eisaki, S. Shamoto, and Y. Matsuda,
Phys. Rev. Lett. 102, 017002 (2009).
Heavy fermions
1. "Cyclotron resonance study of quasiparticle mass and scattering rate in the hidden-order and superconducting phases of URu2Si2"
S. Tonegawa, K. Hashimoto, K. Ikada, Y. Tsuruhara, Y.-H. Lin, H. Shishido, Y. Haga, T. D. Matsuda, E. Yamamoto, Y. Onuki, H. Ikeda, Y. Matsuda, and T. Shibauchi,
Phys. Rev. B 88, 245131 (2013).
2. "Cyclotron Resonance in the Hidden-Order Phase of URu2Si2"
S. Tonegawa, K. Hashimoto, K. Ikada, Y.-H. Lin, H. Shishido, Y. Haga, T. D. Matsuda, E. Yamamoto, Y. Onuki, H. Ikeda, Y. Matsuda, and T. Shibauchi
Phys. Rev. Lett. 109, 036401 (2012).
3. "Possible Phase Transition Deep Inside the Hidden Order Phase of Ultraclean URu2Si2"
H. Shishido, K. Hashimoto, T. Shibauchi, T. Sasaki, H. Oizumi, N. Kobayashi, T. Takamasu, K. Takehana, Y. Imanaka, T. D. Matsuda, Y. Haga, Y. Onuki, and Y. Matsuda
Reviews (in Japanese)
"Field-angle dependence of Majorana excitations in the Kitaev material α-RuCl3",
Y. Mizukami, K. Hashimoto, and T. Shibauchi,
KotaiButsuri 57(11), 643-655 (2022).
"Strongly Correlated Superconductivity Realized in a Coordination Polymer with a Two-Dimensional Kagome Lattice",
K. Ishihara, T. Shibauchi, and K. Hashimoto,
KotaiButsuri 57(7), 411-421 (2022).
"A novel quantum liquid state triggered by a combination of π-electrons and protons" ,
Masaaki Shimozawa, Akira Ueda, Kenichiro Hashimoto, Makoto Naka,
KotaiButsuri 54(1), 43-54 (2019).
"Crystallization and vitrification of strongly correlated electrons in a solid : order and disorder on an underlying geometrically frustrated lattice",
Kenichiro Hashimoto, Takahiko Sasaki,
Invited Talks
20. "Randomness effect on charge glass formation in θ-type BEDT-TTF compounds"
Kenichiro Hashimoto, SPICE Workshop "New Spin on Molecular Quantum Materials", Mainz, Germany, May 24-26, 2022.
19. "Superconducting gap structure of kagome lattice superconductors"
Kenichiro Hashimoto, Yukawa Institute for Theoretical Physics Workshop: Frontiers of superconducting phenomena induced by non-trivial electronic states: New challenges and prospects, Panasonic International Interactive Hall, Yukawa Institute, Kyoto University, December 22-24, 2021.
18. "Strongly correlated superconductivity in a two-dimensional coordination polymer"
Kenichiro Hashimoto, 37th meeting in JSPS Committee 181 (Online), July 28, 2021.
17. "Strongly correlated superconductivity in a coordination polymer with two-dimensional kagome lattice"
Kenichiro Hashimoto, Molecular Crystals Online Seminar (Online), May 25, 2021.
16. "Vitrification and crystallization of electrons in a solid"
Kenichiro Hashimoto, KEK IPNS-IMSS-QUP Joint workshop (Online), March 29-31, 2021.
15. "Geometrical frustration and randomness effects in strongly correlated electron glasses"
Kenichiro Hashimoto, JPS (Online), Divisions 5, 7, 8 Symposium:New frontiers of nonequilibrium phenomena driven by electron correlation effect: From charge glass to photoinduced phase transition, March 12-15, 2021.
14. "Exotic physical properties emerging from geometrically frustrated pi electrons: From quantum liquids to superconductivity"
K. Hashimoto, International Symposium on Molecular Science —Physical Chemistry/Theoretical Chemistry, Chemoinformatics, Computational Chemistry— Cosponsored by Japan Society for Molecular Science (Online), March 19-22, 2021.
13. "Quantum condensed phases created by geometrical frustration and electron correlation"
K. Hashimoto, ISSP Workshop (Online): Recent Progress and Future Prospects of Quantum Materials Research, September 24, 28, 29, 2020.
12. "Geometrical frustration effects on charge and spin degrees of freedom in strongly correlated π electrons"
K. Hashimoto, Electron Correlation in Superconductors and Nanostructures (ECSN-2019), Odessa , Ukraine, October 6-10, 2019.
11. "Geometrical frustration effects on charge and spin degrees of freedom in strongly correlated π electrons"
K. Hashimoto, 7th International Symposium on π-System Figuration , Osaka, Japan, March 29-30, 2019.
10. "Study of charge fluctuations induced by long-range Coulomb interactions of molecular materials in strongly correlated electron systems"
Kenichiro Hashimoto, JPSJ Young Scientist Award Commemorative Lecture, Ito Campus, Kyushu University, 14-17 March 2019.
9. "Crystallization and vitrification of strongly correlated electrons on a geometrically frustrated triangular lattice"
K. Hashimoto, Glass Workshop (Satellite event) in The 2nd Symposium for World Leading Research Centers‐ Materials Science and Spintronics ‐, Sendai, Japan, February 15-18, 2019.
8. "Macroscopic quantum phenomena caused by charge, spin, and lattice degrees of freedom of strongly correlated pi-electrons"
Kenichiro Hashimoto, Molecular Research Institute Workshop, Molecular Research Institute, Okazaki, January 25, 2019.
7. "Vitrification and crystallization of electrons in an organic solid crystal"
Kenichiro Hashimoto, Cryopreservation Conference 2018, Okazaki Conference Center, National Insitutes of National Sciences, October 25-26, 2018.
6. "Quantum spin liquid state in π-systems using hydrogen dynamics"
Kenichiro Hashimoto , JPS Symposium (Division 7), Kyotanabe Campus, Doshisha University, September 9-12, 2018.
5. "Crystallization and Vitrification of Strongly Correlated Electrons on a Geometrically Frustrated Triangular Lattice"
K. Hashimoto, The International Conference on Science and Technology of Synthetic Metals 2018 (ICSM 2018), Busan, Korea, July 1-6, 2018.
4. "Crystallization and Vitrification of π-Electrons in a Geometrically Frustrated Charge-Ordered System"
K. Hashimoto, The 12th International Symposium on Crystalline Organic Metals, Superconductors and Magnets (ISCOM2017), Miyagi Zao, Japan, September 24-29, 2017.
3. "Diverse electronic properties of π-electrons in organic solids"
Kenichiro Hashimoto, The 3rd Young Researchers Association Meeting, Ishikawa, November 11-12, 2016.
2. "Quantum paraelectricity in the proton-π-electron correlated organic conductor κ-H3(Cat-EDT-TTF)2"
Kenichiro Hashimoto, ISSP Workshop: Frontiers of π-electronic condensed matter science, ISSP, The University of Tokyo, August 8-10, 2016.
1. "Dielectric and optical properties of κ-H3(Cat-EDT-TTF)2"
Kenichiro Hashimoto, ISSP Worlshop: Functional properties of π-electron-hydrogen correlated molecular materials, ISSP, The University of Tokyo, March 29, 2016.