Mott gap excitations in twin-free YBa2Cu3O7-δ (Tc = 93 K) studied by resonant inelastic X-ray scattering -: art. no. 187002

被引:37
作者
Ishii, K [1 ]
Tsutsui, K
Endoh, Y
Tohyama, T
Kuzushita, K
Inami, T
Ohwada, K
Maekawa, S
Masui, T
Tajima, S
Murakami, Y
Mizuki, J
机构
[1] Japan Atom Energy Res Inst, Synchrotron Radiat Res Ctr, Hyogo 6795148, Japan
[2] Tohoku Univ, Inst Mat Res, Sendai, Miyagi 9808577, Japan
[3] Int Inst Adv Studies, Kyoto 6190025, Japan
[4] ISTEC, Superconducting Res Lab, Tokyo 1350062, Japan
[5] Tohoku Univ, Dept Phys, Sendai, Miyagi 9808578, Japan
关键词
D O I
10.1103/PhysRevLett.94.187002
中图分类号
O4 [物理学];
学科分类号
0702 ;
摘要
Mott gap excitations in the optimally doped high-T-c superconductor YBa2Cu3O7-delta (T-c=93 K) have been studied by the resonant inelastic x-ray scattering method. Anisotropic spectra in the ab plane are observed in a twin-free crystal. The excitation from the one-dimensional CuO chain is enhanced at 2 eV near the zone boundary of the b* direction, while the excitation from the CuO2 plane is broad at 1.5-4 eV and almost independent of the momentum transfer. Theoretical calculations based on the one-dimensional and two-dimensional Hubbard model reproduces the observed spectra when different values of the on-site Coulomb energy are assumed. The Mott gap of the CuO chain site is found to be much smaller than that of the CuO2 plane site.
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共 28 条
[11]   Resonant inelastic x-ray scattering study of the hole-doped manganites La1-xSrxMnO3 (x=0.2, 0.4) -: art. no. 224437 [J].
Ishii, K ;
Inami, T ;
Ohwada, K ;
Kuzushita, K ;
Mizuki, J ;
Murakami, Y ;
Ishihara, S ;
Endoh, Y ;
Maekawa, S ;
Hirota, K ;
Moritomo, Y .
PHYSICAL REVIEW B, 2004, 70 (22) :224437-1
[12]   Charge and orbital excitations in Li2CuO2 -: art. no. 155105 [J].
Kim, YJ ;
Hill, JP ;
Chou, FC ;
Casa, D ;
Gog, T ;
Venkataraman, CT .
PHYSICAL REVIEW B, 2004, 69 (15) :155105-1
[13]   Resonant inelastic X-ray scattering of the holon-antiholon continuum in SrCuO2 -: art. no. 137402 [J].
Kim, YJ ;
Hill, JP ;
Benthien, H ;
Essler, FHL ;
Jeckelmann, E ;
Choi, HS ;
Noh, TW ;
Motoyama, N ;
Kojima, KM ;
Uchida, S ;
Casa, D ;
Gog, T .
PHYSICAL REVIEW LETTERS, 2004, 92 (13) :137402-1
[14]   Resonant inelastic X-ray scattering study of charge excitations in La2CuO4 -: art. no. 177003 [J].
Kim, YJ ;
Hill, JP ;
Burns, CA ;
Wakimoto, S ;
Birgeneau, RJ ;
Casa, D ;
Gog, T ;
Venkataraman, CT .
PHYSICAL REVIEW LETTERS, 2002, 89 (17) :177003/1-177003/4
[15]   ANISOTROPY OF THE REFLECTANCE SPECTRUM AND OF THE DIELECTRIC FUNCTION OF YBA2CU3O7 WITHIN THE (001)PLANE [J].
KOCH, B ;
GESERICH, HP ;
WOLF, T .
SOLID STATE COMMUNICATIONS, 1989, 71 (06) :495-499
[16]   CU K-EDGE X-RAY-ABSORPTION NEAR-EDGE STRUCTURE AND ELECTRONIC-STRUCTURE OF ND2-XCEXCUO4-Y AND LA2-XSRXCUO4 [J].
KOSUGI, N ;
TOKURA, Y ;
TAKAGI, H ;
UCHIDA, S .
PHYSICAL REVIEW B, 1990, 41 (01) :131-137
[17]   Superconducting gap and strong in-plane anisotropy in untwinned YBa2Cu3O7-δ [J].
Lu, DH ;
Feng, DL ;
Armitage, NP ;
Shen, KM ;
Damascelli, A ;
Kim, C ;
Ronning, F ;
Shen, ZX ;
Bonn, DA ;
Liang, R ;
Hardy, WN ;
Rykov, AI ;
Tajima, S .
PHYSICAL REVIEW LETTERS, 2001, 86 (19) :4370-4373
[18]   Electronic structure of the CuO-chain layer in YBa2Cu3O7-δ studied by scanning tunneling microscopy -: art. no. 140511 [J].
Maki, M ;
Nishizaki, T ;
Shibata, K ;
Kobayashi, N .
PHYSICAL REVIEW B, 2002, 65 (14) :1-4
[19]   Friedel oscillations in a two-band Hubbard model for CuO chains [J].
Mori, M ;
Tohyama, T ;
Maekawa, S ;
Riera, JA .
PHYSICAL REVIEW B, 2004, 69 (01)
[20]   Impurities and quantum interference in the chains of YBa2Cu3O6+x -: art. no. 067005 [J].
Morr, DK ;
Balatsky, AV .
PHYSICAL REVIEW LETTERS, 2003, 90 (06) :4