Publications 1999 - 2005

2005

Zhou, X.J., B. Wannberg, W.L. Yang, V. Brouet, Z. Sun, J.F. Douglas, D. Dessau, Z. Hussain, and Z.-X. Shen, "Space charge effect and mirror charge effect in photoemission spectroscopy" Journal of Electron Spectroscopy and Related Phenomena 142, 27 (2005).

Seidel, A., and D.-H. Lee, "The Luther-Emery liquid: Spin gap and anomalous flux period" Physical Review B: Condensed Matter and Materials Physics 71, 0451133 (2005).

Graf, J., C. Jozwiak, A.K. Schimd, Z. Hussain, and A. Lanzara, "Mapping spin-dependent electron reflectivity in Fe and Co ferromagnetic thin films" Physical Review B: Condensed Matter and Materials Physics 71, 144429 (2005).

Rosch, O., O. Gunnarsson, X.J. Zhou, T. Yoshida, T. Sasagawa, A Fujimori, Z. Hussain, Z.X. Shen, and S. Uchida, "Polaronic Bahavior of Undoped High Tc Cuprate Superconductors from Angle-Resolved Photoemision Spectra" Physical Review Letters 95, 227002 (2005).

Zhou, X., J. Shi, T. Yoshida, T. Cuk, W.L. Yang, V.M. Brouet, J. Nakamura, N. Mannella, S. Komiya, Y. Ando, W.X. Ti, Z.X Zhao, T. Sasagawa, T. Kakeshita, H. Eisaki, S. Uchida, A. Fujimori, Z. Zhang, W.E. Plummer, R.B. Laughlin, Z. Hussain, Z. Shen, and Z-X Shen, "Multiple Bosonic Mode Coupling in the Electron Self-Energy of (La2-xSrx)CuO4" Physical Review Letters 95, 117001 (2005).

Zhou, S.Y., G.H. Gweon, C.D. Spataru, J. Graf, D.H. Lee, S.G. Louie, and A. Lanzara, "Coexistence of Sharp Quasiparticle Dispersions and Disorder Features in Polycrystalline Graphite" Physical Review B: Condensed Matter and Materials Physics 71 (R), 161403 (2005).

Biagioni, P., A. Brambilla, M. Portalupi, N. Rougemaille, A.K. Schmid, A. Lanzara, P. Vavassori, M. Zani, M. Finazzi, L. Duo', and F. Ciccacci, "Magnetic properties of Fe/NiO/Fe(001) trilayers" Journal of Magnetism and Magnetic Materials 290-291, 153 (2005).

Sasagawa, T., A. Lanzara, G.H. Gweon, S. Zhou, J. Graf, Suryadijaya, and H. Takagi, "Oxygen isotope effect on electron dynamics in Bi 2Sr 2CaCu 2O y: angle-resolved photoemission spectroscopy" Physica C: Superconductivity and Its Applications 426, 436 (2005).

Seidel, A., H.-H. Lin, and D.-H. Lee, "Phonons in Hubbard ladders studied within the framework of the one-loop renormalization group" Physical Review B: Condensed Matter and Materials Physics 71, 022051 (2005).

Shin, K.Y., V. Brouet, N. Ru, Z.X. Shen, and I.R. Fisher, "Electronic structure and charge-density wave formation in LaTe1.95 and CeTe2.00" Physical Review B: Condensed Matter and Materials Physics 72, 085132 (2005).

Mannella, N., W. Yang, X.J. Zhou, H. Zheng, J.F. Mitchell, J. Zaanen, T. Devereaux, N. Nagaosa, Z. Hussain, and Z.X. Shen, "Nodal Quasiparticle in Psuedogapped Colossal Magnetoresistive Manganites" Nature 438, 04273 (2005).

2004

Gweon, G.H., S.Y. Zhou, and A. Lanzara, "Strong Influence of Phonons on the Electron Dynamics of Bi2Sr2CaCu2O8+d" Journal of Physics and Chemistry of Solids 65, 1397 (2004).

Gweon, G.H., T. Sasagawa, S.Y. Zhou, J. Graf, H. Takagi, D.H. Lee, and A. Lanzara, "An unusual isotope effect in a high-transition-temperature superconductor" Nature 430, 187 (2004).

Brouet, V., W.L. Yang, X.J. Zhou, Z. Hussain, N. Ru, K.Y. Shin, I.R. Fisher, and Z.X. Shen, "Fermi Surface Reconstruction in the CDW State of CeTe 3 Observed by Photoemission" Physical Review Letters 93, 126405 (2004).

Cuk, T., F. Baumberger, D.H. Lu, N. Ingle, X.J. Zhou, H. Eisaki, N. Kaneko, Z. Hussain, T.P. Devereaux, N. Nagaosa, and Z.X. Shen, "Coupling of the B-1g phonon to the antinodal electronic states of Bi2Sr2Ca0.92YO.08Cu2O8+delta" Physical Review Letters 93, 117003 (2004).

Tang, S.J., J.R. Shi, B. Wu, P.T. Sprunger, W.L. Yang, V. Brouet, Z.J. Zhou, Z. Hussain, Z.A. Shen, Z.Y. Zhang, and E.W. Plummer, "A spectroscopic view of electron-phonon coupling at metal surfaces" Physica Status Solidi B: Basic Research 241, 2345 (2004).

Shen, K.M., T. Yoshida, D.H. Lu, F. Ronnig, N.P. Armitage, W.S. Lee, X.J. Zhou, A. Damascelli, D.L. Feng, N.J. C. Ingle, H. Eisaki, H. Takagi, S. Uchida, A. Fujimori, Z.-X. Shen, et al ., "Fully gapped single-particle excitations in the lightly doped cuprates" Physical Review B: Condensed Matter and Materials Physics 69, 054503 (2004).

Shi, J., S.-J. Tang, B. Wu, P.T. Sprunger, W.L. Yang, V. Brouet, X.J. Zhou, Z. Hussain, Z.-X. Shen, Z. Zhang, and E.W. Plummer "Direct Extraction of the Eliashberg Function for Electron-Phonon Coupling: A Case Study of Be(1010)" Physical Review Letters 92, 186401 (2004).

Zhou, X.J., T. Yoshida, D.-H. Lee, W.L. Yang, V. Brouet, F. Zhou, W.X. Ti, J.W. Xiong, Z.X. Zhao, T. Sasagawa, T. Kakeshita, H. Eisaki, S. Uchida, A. Fujimori, Z. Hussain, and Z.-X. Shen, "Dichotomy between Nodal and Antinodal Quasiparticles in Underdoped (La2-xSrx)CuO4 Superconductors" Physical Review Letters 92, 187001 (2004).

Chuang, Y.-D., A.D. Gromko, A.V. Fedorov, Y. Aiura, K. Oka, Y. Ando, M. Lindroos, R.S. Markiewicz, A. Bansil, and D.S. Dessau, "Bilayer splitting and coherence effects in optimal and underdoped Bi2Sr2CaCu2O8+d" Physical Review B: Condensed Matter and Materials Physics 69, 094515 (2004).

Brouet, V., W.L. Yang, X.J. Zhou, H.J. Choi, S.G. Louie, M.L. Cohen, A. Goldoni, F. Parmigiani, Z. Hussain, and Z.X. Shen, "Orientation-Dependent C 60 Electronic Structures Revealed by Photoemission Spectroscopy" Physical Review Letters 93, 197601 (2004).

Seidel, A., and D.-H. Lee, "Flux period, spin gap, and pairing in the one-dimensional t-J-J(') model" Physical Review Letters 93, 046401 (2004).

Lanzara, A., "Nodal vs Antinodal Quasiparticles in Optimally Doped Bi2212 Superconductor" Physica C: Superconductivity and Its Applications 412-414, 46 (2004).

2003

Schaefer, J., M. Sing, R. Claessen, E. Rotenberg, X.J. Zhou, R.E. Thorne, and S.D. Kevan, "Unusual Spectral Behavior of Charge Density Waves with Perfect Nesting in a Quasi-One-Dimensional Metal" Physical Review Letters 91, 066401 (2003).

Armitage, N.P., D.H. Lu, C. Kim, A. Damascelli, K.M. Shen, F. Ronnig, D.L. Feng, P. Bogdanov, X.J. Zhou, W.L. Yang, Z. Hussain, P.K. Mang, N. Kaneko, M. Greven, Y. Onose, et al ., "An Angle-Resolved Photoemission Spectral Function Analysis of the Electron-Doped Nd1.85Sr0.15CuO4" Physical Review B: Condensed Matter and Materials Physics 68, 064517 (2003).

Mo, S.-K., J.D. Denlinger, H.-D. Kim, J.-H. Park, J.W. Allen, A. Sekiyama, A. Yamasaki, K. Kadono, S. Suga, Y. Saitoh, T. Muro, P. Metcalf, G. Keller, K. Held, V. Eyert, V.I. Anisimov, D. Vollhardt, et al ., "Prominent Quasiparticle Peak in the Photoemission Spectrum of the Metallic Phase of V2O3" Physical Review Letters 90, 186403 (2003).

Damascelli, A., Z. Hussain, and Z.-X. Shen, "Angle-Resolved Photoemission Studies of the Cuparte Superconductors" Reviews of Modern Physics 75, 473 (2003).

Zhou, X.J., T. Yoshida, A. Lanzara, P.V. Bogdanov, S.A. Keller, K.M. Shen, W.L. Yang, F. Ronning, T. Sasagawa, T. Kakeshita, T. Noda, H. Eisaki, S. Uchida, C.T. Lin, F. Zhou, J.W. Xiong, W.X. Ti, Z.X. Zhao, A. Fujimori, Z. Hussian, Z.-X. Shen, et al ., "High-temperature superconductors: Universal nodal Fermi velocity" Nature 423, 398 (2003).

Ronning, F., C. Kim, K.M. Shen, N.P. Armitage, A. Damascelli, D.H. Lu, D.L. Feng, Z.-X. Shen, L.L. Miller, Y.-J. Kim, F. Chou, and I. Terasaki, "Universality of the electronic structure from a half-filled CuO2 plane" Physical Review B: Condensed Matter and Materials Physics 67, 035113 (2003).

Gromko, A.D., A.V. Fedorov, Y.-D. Chuang, J.D. Koralek, Y. Aiura, Y. Yamaguchi, K. Oka, Y. Ando, and D.S. Dessau, "Mass-renormalized electronic excitations at (Pi,0) in the superconducting state of Bi2Sr2CaCu2O8+d" Physical Review B: Condensed Matter and Materials Physics 68, 174520 (2003).

Uchiyama, H., S. Tajima, K.M. Shen, D.H. Lu, and Z.-X. Shen, "Photoemission studies in MgB2" Physica C: Superconductivity and Its Applications 385, 85 (2003).

Yoshida, T., X.J. Zhou, T. Sasagawa, W.L. Yang, P.V. Bogdanov, A. Lanzara, Z. Hussain, T. Mizokawa, A. Fujimori, H. Eisaki, Z.-X. Shen, T. Kakeshita, and S. Uchida, "Metallic Behavior of Lightly Doped La2-xSrxCuO4 with a Fermi Surface Forming an Arc" Physical Review Letters 91, 027001 (2003).

Kohsaka, Y., T. Sasagawa, F. Ronning, T. Yoshida, C. Kim, T. Hanaguri, M. Azuma, M. Takano, Z.-X. Shen, and H. Takagi, "Angle-resolved photoemission spectroscopy of (Ca,Na)(2)CuO2Cl2 crystals: Fingerprints of a magnetic insulator in a heavily underdoped superconductor" Journal of the Physical Society of Japan 72, 1018 (2003).

Yang, W.L., V. Brouet, X.J. Zhou, H.J. Choi, S.G. Louie, M.L. Cohen, S.A. Kellar, P.V. Bogdanov, A. Lanzara, A. Goldoni, F. Parmigiani, Z. Hussain, and Z.X. Shen, "Band structure and fermi surface of electron-doped C60 monolayers" Science 300, 303 (2003).

Ronning, F., T. Sasagawa, Y. Kohsaka, K.M. Shen, A. Damascelli, C. Kim, T. Yoshida, N.P. Armitage, D.H. Lu, D.L. Feng, L.L. Miller, H. Takagi, and Z.-X. Shen, "Evolution of a metal to insulator transition in Ca2-xNaxCuO2Cl2 as seen by angle-resolved photoemission" Physical Review B: Condensed Matter and Materials Physics 67, 165101 (2003).

2002

Bogdanov, P.V., A. Lanzara, X.J. Zhou, W.L. Yang, H. Eisaki, Z. Hussain, and Z.-X. Shen, "Anomalous Momentum Dependence of the Quasiparticle Scattering Rate in Overdoped Bi2Sr2Ca2Cu3O10" Physical Review Letters 89, 167002 (2002).

Rehr, J.J., W. Schattke, F.J. Garcia de Abajo, R. Diez Muino, and M.A. Van Hove, "Development of the Scattering Theory of X-ray Absorption and Core level Photoemission" Journal of Electron Spectroscopy and Related Phenomena 126, 67 (2002).

Denlinger, J.D., J.A. Clack, J.W. Allen, G.H. Gweon, D.M. Poirier, C.G. Olson, J.L. Sarrao, A.D. Bianchi, and Z. Fisk, "Bulk band gaps in divalent hexaborides" Physical Review Letters 89, 157601 (2002).

Gromko, A.D., Y.-D. Chuang, A.V. Fedorov, Y. Aiura, Y. Yamaguchi, K. Oka, Y. Ando, and D.S. Dessau, "ARPES studies of c-axis intracell coupling in Bi2Sr2CaCu2O8+d" Journal of Physics and Chemistry of Solids 63, 2299 (2002).

Lanzara, A., P. V. Bogdanov, X. J. Zhou, H. Eisaki, T. Yoshida, A. Fujimori, Z. Hussain, and Z.-X. Shen, "Coupling of quasiparticles to phonons in high temperature superconductors" Journal of Electron Spectroscopy and Related Phenomena 127, 37 (2002).

Zhou, X. J., Z. Hussain, and Z.-X Shen, "High resolution angle-resolved photoemission study of high temperature superconductors: charge-ordering, bilayer splitting and electron-phonon coupling" Journal of Electron Spectroscopy and Related Phenomena 126, 145 (2002).

Feng, D.L., A. Damascelli, K. Shen, N. Motoyama, D.H. Lu, H. Eisaki, X. J. Zhou, Z.-X Shen, et al ., "Electronic Structure of the Trilayer Cuprate Superconductor Bi2Sr2Ca2Cu3O10+d" Physical Review Letters 88, 107001 (2002).

Denlinger, J.D., G.-H. Gweon, J.W. Allen, and J.L. Sarrao, "Possibility of minimal surface contributions to low photon energy angle-resolved photoemission of CeRu2Si2" Physica B: Condensed Matter 312-313, 670 (2002).

Denlinger, J. D., G.-H. Gweon, J. W. Allen, and J. L. Sarrao, "Temperature dependent 5f-states in URu2Si2" Physica B: Condensed Matter 312-313, 655 (2002).

Kim, C., F. Ronning, A. Damascelli, D.L. Feng, Z.-X. Shen, B.O. Wells, Y.J. Kim, R.J. Birgeneau, M.A. Kastner, L.L. Miller, H. Eisake, and S. Uchida, "Anomalous Temperature Dependence in Photoemission Spectral Function of Cuprates" Physical Review B: Condensed Matter and Materials Physics 65, 174516 (2002).

Pagliara, S., L. Sangaletti, A. Goldoni, C. Kim, Z.-X. Shen, A. Revcolevschi, G. Dhalenne, and F. Parmigiani, "Coexistence of Interfering and Non-interfering Channels in Resonant Photoemission Spectra across the Cu2p-3d Threshold" Physical Review B: Condensed Matter and Materials Physics 65, 205107 (2002).

Feng, D.L., H. Eisaki, K.M. Shen, A. Damascelli, C. Kim, D.H. Lu, Z.-X. Shen, K. Shimizu, J.-I. Shimoyama, K. Kishio, N. Motoyama, N. Kaneko, M. Greven, and G.D. Gu, "Photoemission study of the intra-unit-cell coupling in a trilayer cuprate" International Journal of Modern Physics B 16, 1691 (2002).

Ino, A., C. Kim, M. Nakamura, T. Yoshida, T. Mizokawa, Z.-X. Shen, A. Fujimori, T. Kakeshita, H. Eisaki, and S. Uchida, "Doping dependent evolution of the electronic structure of La2-xSrxCuO4 in the superconducting and metallic phases" Physical Review B: Condensed Matter and Materials Physics 65, 094504 (2002).

Mizokawa, T., K. Nakada, C. Kim, Z.-X. Shen, T. Yoshida, A. Fujimori, S. Horii, Yuh Yamada, H. Ikuta, and U. Mizutani, "Angle-Resolved Photoemission Study of Zn-Doped PrBa2Cu4O8: Possible Observation of Single-Particle Spectral Function for a Tomonaga-Luttinger Liquid" Physical Review B: Condensed Matter and Materials Physics 65, 193101 (2002).

Hasan, M.Z., P.A. Montano, E.D. Isaacs, Z.-X. Shen, H. Eisake, S.K. Sinha, Z. Islam, N. Montovama, and S. Uchjda, "Momentum Resolved Charge Excitations in a One-Dimensional Prototype Mott Insulator" Physical Review Letters 88, 177403 (2002).

Uchiyama, H., K. M. Shen, S. Lee, A. Damascelli, D.H. Lu, D.L. Feng, Z.-X. Shen, and S. Tajima, "Electronic Structure of MgB2 Studied by Angle-Resolved Photoemission Spectroscopy" Physical Review Letters 88, 157002 (2002).

Feng, D.L., C. Kim, H. Eisaki, D.H. Lu, K.M. Shen, F. Ronning, N.P. Armitage, A. Damascelli, N. Kaneko, M. Greven, J. Shimoyama, K. Kishio, R. Yoshizami, G.D. Cu, and Z.-X. Shen, "Electronic Excitations near the Brillouin Zone Boundary of Bi2212" Physical Review B: Condensed Matter and Materials Physics 65, 220501 (2002).

Armitage, N. P., F. Ronning, D.H. Lu, C. Kim, A. Damascelli, K.M. Shen, D.L. Feng, H. Eisaki, Z._X. Shen, P.K. Mang, N. Kaneko, M. Greven, Y. Onose, Y. Taguchi, and Y. Tokura, "Doping Dependence of n-Type Superconductors Investigated by ARPES" Physical Review Letters 88, 257001 (2002).

Wang, Z.Y., M.A. Kelly, Z.-X. Shen, G. Wang, X.D. Xiang, and J.T. Wetzel, "Evanescent Microwave Probe Measurement of Low-k Dielectric Films" Journal of Applied Physics 92, 808 (2002).

Shen, Z.-X., A. Lanzara, S. Ishihara, and N. Nagaosa, "Role of the electron-phonon interaction in the strongly correlated cuprate superconductors" Philosophical Magazine 82, 1349 (2002).

2001

Lanzara, A., P.V. Bogdanov, S.A. Kellar, X.J. Zhou, E.D. Lu, G. Gu, J.-I. Shinoyama, K. Kishio, Z. Hussain, Z.-X. Shen, et al ., "Evidence for abrupt change in dispersion and scattering rate of quasiparticles in Bi2Sr2CaCu2O8" Journal of Physics and Chemistry of Solids 62, 21 (2001).

Denlinger, J.D., G.-H. Gweon, J.W. Allen, C.G. Olson, M.B. Maple, J.L. Sarrao, P.E. Armstrong, Z. Fisk, and H. Yamagami, "Comparative study of the electronic structure of XRu2Si2: probing the Anderson lattice" Journal of Electron Spectroscopy and Related Phenomena 117, 347 (2001).

Chuang, Y.D., A.D. Gromko, A. Fedorov, Y. Aiura, K. Oka, Y. Ando, H. Eisaki, S.I. Uchida, and D.S. Dessau, "Doubling of the bands in overdoped Bi 2Sr 2CaCu 2O 8: Evidence for c-axis bilayer coupling" Physical Review Letters 87, 117002 (2001).

Orgad, D., S.A. Kivelson, E.W. Carlson, V.J. Emery, X.J. Zhou, and Z.X. Shen, "Evidence of electron fractionalization from photoemission spectra in the high temperature Ssuperconductors" Physical Review Letters 86, 4362 (2001).

Zhou, X.J., T. Yoshida, S.A. Kellar, P.V. Bogdanov, E.D. Lu, A. Lanzara, S. Fujimora, M. Nakamura, M. Noda, T. Kakeshita, H. Eisaka, H. Uchida, Z. Hussain, and Z.X. Shen, "Dual Nature of the Electronic Structure of (La2-x-yNdySrx)CuO4 and La1.85Sr0.15CuO4" Physical Review Letters 86, 5578 (2001).

Yoshida, T., X.J. Zhou, M. Nakamura, S.A. Kellar, P.V. Bogdanov, E.D. Lu, A. Lanzara, Z. Hussain, A. Ino, T. Mizokawa, A. Fujimori, H. Eisaki, C. Kim, Z.X. Shen, T. Kakeshita, S. Uchida, et al ., "Electronlike Fermi surface and remnant (pi,0) feature in overdoped La1.78Sr0.22CuO4" Physical Review B: Condensed Matter and Materials Physics 63, 220501 (2001).

Lanzara, A., P.V. Bogdanov, X.J. Zhou, S.A. Kellar, D.L. Feng, E.D. Lu, T. Yoshida, H. Eisaki, A. Fujimori, K. Kishio, J.I. Shimoyama, T. Noda, S. Uchida, Z. Hussain, Z.X. Shen, et al ., "Evidence for ubiquitous strong electron-phonon coupling in high-temperature superconductors" Nature 412, 510 (2001).

Chuang, Y.D., A.D. Gromko, D.S. Dessau, T. Kimura, and Y. Tokura, "Fermi surface nesting and nanoscale fluctuating charge/orbital ordering in colossal magnetoresistive oxides" Science 292, 1509 (2001).

Yeom, H., "Self-organized quantum wires on semiconductor surfaces: the new frontier provided by reduced dimensionality" Journal of Electron Spectroscopy and Related Phenomena 114-116, 283 (2001).

Armitage, N.P., D.H. Lu, C. Kim, A. Damascelli, K.M. Shen, F. Ronning, D.L. Feng, P. Bogdanov, Z.-X. Shen, Y. Onose, Y. Taguchi, Y. Tokura, P.K. Mang, N. Kaneko, and M. Greven, "Anomalous electronic structure and pseudogap effects in Nd1.85Ce0.15cu04" Physical Review Letters 87, 147003 (2001).

Bogdanov, P.V., A. Lanzara, X. Zhou, S.A. Kellar, D.L. Feng, E.D. Lu, H. Eisaki, A. Fujimori, Z. Hussain, Z.X. Shen, et al ., "Photoemission study of Pb doped Bi2212-A Fermi surface picture" Physical Review B: Condensed Matter and Materials Physics 64, 180505 (2001).

Dessau, D. S, Y. D Chuang, A. Gromko, T. Saitoh, T. Kimura, and Y. Tokura, "Electronic structure of CMR oxides: High Resolution electron-spectroscopic studies and a pseudogap" Journal of Electron Spectroscopy and Related Phenomena 117-118, 265 (2001).

2000

Chuang, Y. D, A. D Gromko, D. S Dessau, K. Nakamura, and Y. Ando, "Fermi surface topology of Bi2Sr2CaCu2O8+d at hv=33eV" Physica C: Superconductivity and Its Applications 341-348, 2079 (2000).

Yoshida, T., M. Nakamura, A. Ino, T. Mizokawa, A. Fujimori, X.J. Zhou, S.A. Kellar, P.V. Bogdanov, E.D. Lu, A. Lanzara, H. Eisaki, Z. Hussain, Z.-X. Shen, T. Kakeshita, and S. Uchida, “Nodal spectral weight and Fermi surface in La2-‐xSrxCuO4” Int. J. Mod. Phys. B 14, 3777 (2000).

Bogdanov, P.V., A. Lanzara, S.A. Kellar, X.J. Zhou, E.D. Lu, W.J. Zheng, G. Gu, J.I. Shimoyama, K. Kishio, H. Ikeda, R. Yoshizaki, Z. Hussain, and Z.-X. Shen, "Evidence for an energy scale for quasiparticle dispersion in Bi2Sr2CaCu2O8" Physical Review Letters 85, 2581 (2000).

1999

Shen, Z.-X., and G.A. Sawatzky, "Novel electronic structure of cuprate superconductors revealed by the anomalous spectral lineshape in ARPES experiments" Physica Status Solidi B: Basic Research 215, 529 (1999).

Zhou, X.J., P. Bogdanov, S.A. Kellar, T.Noda, H. Eisaki, S. Uchida, Z. Hussain, and Z.-X. Shen, “One Dimensional Electronic Structure and Suppression of d-‐Wave Node State in Nd-‐LSCO” Science 286, 268 (1999).

Balatsky, A.V., and Z.-X. Shen, "Condensed matter physics - Is this why T-c is so low?" Science 284, 1137 (1999).