Electronic structure of Y2-xCaxBaNiO5 from photoemission and inverse photoemission

被引：29

作者：

Maiti, K ^{[1
]}

Sarma, DD

机构：

[1] Indian Inst Sci, Solid State & Struct Chem Unit, Bangalore 560012, Karnataka, India

[2] Indian Inst Sci, Jawaharlal Nehru Ctr Adv Sci Res, Bangalore 560012, Karnataka, India

来源：

PHYSICAL REVIEW B | 1998年 / 58卷 / 15期

关键词：

D O I：

10.1103/PhysRevB.58.9746

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

We investigate the electronic structure of a one-dimensional spin-1 system, Y2BaNiO5, and hole-doped Y2-xCaxBaNiO5 for x=0.2 and 0.4, employing photoemission and inverse photoemission spectroscopies. Y2BaNiO5 has a charge excitation gap of about 2.3 eV. Hole doping via Ca substitution in this system introduces new localized states within this gap. The existence of a finite gap (similar to 0.6 eV), even in doped compounds with a variable-range-hopping transport, indicates the importance of correlation effects and disorder in determining the electronic structure in this system. [S0163-1829(98)01739-1].

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收藏

页码：9746 / 9751

页数：6

相关论文

共 46 条

[31] Electronic structure of La1-xSrxCrO3 [J].

Maiti, K ;

Sarma, DD .

PHYSICAL REVIEW B, 1996, 54 (11) :7816-7822

[32]

MAITI K, UNPUB

[33] Raman-scattering evidence for free spinons in the one-dimensional spin-1/2 chains of Sr2CuO3 and SrCuO2 [J].

Misochko, OV ;

Tajima, S ;

Urano, C ;

Eisaki, H ;

Uchida, S .

PHYSICAL REVIEW B, 1996, 53 (22) :14733-14736

[34] TEMPERATURE-DEPENDENCE OF THE ELECTRON-SPIN-RESONANCE SPECTRUM OF THE CHAIN-END S = 1/2 MODES IN AN S = 1 ANTIFERROMAGNETIC CHAIN [J].

MITRA, PP ;

HALPERIN, BI ;

AFFLECK, I .

PHYSICAL REVIEW B, 1992, 45 (10) :5299-5306

[35] Magnetic susceptibility of ideal spin 1/2 Heisenberg antiferromagnetic chain systems, Sr2CuO3 and SrCuO2 [J].

Motoyama, N ;

Eisaki, H ;

Uchida, S .

PHYSICAL REVIEW LETTERS, 1996, 76 (17) :3212-3215

[36] O 1s near-edge x-ray absorption of La2-xSrxNiO4+delta: Holes, polarons, and excitons [J].

Pellegrin, E ;

Zaanen, J ;

Lin, HJ ;

Meigs, G ;

Chen, CT ;

Ho, GH ;

Eisaki, H ;

Uchida, S .

PHYSICAL REVIEW B, 1996, 53 (16) :10667-10679

[37] SPECIFIC-HEAT OF DEFECTS IN HALDANE SYSTEMS Y2BANIO5 AND NENP - ABSENCE OF FREE SPIN-1/2 EXCITATIONS [J].

RAMIREZ, AP ;

CHEONG, SW ;

KAPLAN, ML .

PHYSICAL REVIEW LETTERS, 1994, 72 (19) :3108-3111

[38] BAND THEORY FOR GROUND-STATE PROPERTIES AND EXCITATION-SPECTRA OF PEROVSKITE LAMO(3) (M=MN, FE, CO, NI) [J].

SARMA, DD ;

SHANTHI, N ;

BARMAN, SR ;

HAMADA, N ;

SAWADA, H ;

TERAKURA, K .

PHYSICAL REVIEW LETTERS, 1995, 75 (06) :1126-1129

[39] APPEARANCE OF CORRELATION-EFFECTS IN U INTERMETALLICS [J].

SARMA, DD ;

HILLEBRECHT, FU ;

SPEIER, W ;

MARTENSSON, N ;

KOELLING, DD .

PHYSICAL REVIEW LETTERS, 1986, 57 (17) :2215-2218

[40] PHOTOEMISSION AND INVERSE PHOTOEMISSION OF TRANSITION-METAL SILICIDES [J].

SPEIER, W ;

VONLEUKEN, E ;

FUGGLE, JC ;

SARMA, DD ;

KUMAR, L ;

DAUTH, B ;

BUSCHOW, KHJ .

PHYSICAL REVIEW B, 1989, 39 (09) :6008-6016

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