ROLE OF OXYGEN IN SUPERCONDUCTIVITY OF ND2-XCEXCUO4-Y STUDIED BY X-RAY-ABSORPTION NEAR-EDGE STRUCTURE

被引：36

作者：

OYANAGI, H ^{[1
]}

YOKOYAMA, Y ^{[1
]}

YAMAGUCHI, H ^{[1
]}

KUWAHARA, Y ^{[1
]}

KATAYAMA, T ^{[1
]}

NISHIHARA, Y ^{[1
]}

机构：

[1] INST PHYS & CHEM RES,WAKO,SAITAMA 351,JAPAN

来源：

PHYSICAL REVIEW B | 1990年 / 42卷 / 16期

关键词：

D O I：

10.1103/PhysRevB.42.10136

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

The effect of reduction on the electron states of Nd2-xCexCuO4-y (0.15<x<0.17) has been revealed by x-ray-absorption near-edge structure on the Cu K edge for a series of samples annealed at various oxygen partial pressures (pO2=110-3 atm). We find that the Ce doping-induced states in the near-edge structure systematically increase the magnitude with the decrease of oxygen partial pressure, well correlating with the oxygen pressure dependence of superconducting fraction and Tc value. The results indicate that the reduction strongly enhances the electron density at the copper sites, through the removal of a small number of defect oxygen atoms that suppress n-type doping in the CuO2 plane. © 1990 The American Physical Society.

引用

页码：10136 / 10140

页数：5

共 24 条

[1] EFFECT OF CE DOPING ON THE CU CHARGE IN THE ELECTRON SUPERCONDUCTOR ND2-XCEXCUO4 [J].

ALP, EE ;

MINI, SM ;

RAMANATHAN, M ;

DABROWSKI, B ;

RICHARDS, DR ;

HINKS, DG .

PHYSICAL REVIEW B, 1989, 40 (04) :2617-2619

[2]

FORTUNE NA, UNPUB

[3] VALENCE-BAND AND CU 2P CORE-LEVEL ELECTRONIC-STRUCTURES OF ND2-XCEXCUO4 STUDIED BY X-RAY PHOTOEMISSION [J].

FUKUDA, Y ;

SUZUKI, T ;

NAGOSHI, M ;

SYONO, Y ;

OHISHI, K ;

TACHIKI, M .

SOLID STATE COMMUNICATIONS, 1989, 72 (12) :1183-1186

[4] X-RAY PHOTOEMISSION SPECTROSCOPY OF ND2-XCEXCUO4-Y AND LA2-XSRXCUO4 [J].

ISHII, H ;

KOSHIZAWA, T ;

KATAURA, H ;

HANYU, T ;

TAKAI, H ;

MIZOGUCHI, K ;

KUME, K ;

SHIOZAKI, I ;

YAMAGUCHI, S .

JAPANESE JOURNAL OF APPLIED PHYSICS PART 2-LETTERS & EXPRESS LETTERS, 1989, 28 (11) :L1952-L1954

[5] NEUTRON AND ELECTRON-DIFFRACTION STUDY OF THE ELECTRON-DOPED SUPERCONDUCTOR ND1.845CE0.155CUO4-Y [J].

IZUMI, F ;

MATSUI, Y ;

TAKAGI, H ;

UCHIDA, S ;

TOKURA, Y ;

ASANO, H .

PHYSICA C, 1989, 158 (03) :433-439

[6] STRUCTURE OF THE INTERSTITIAL OXYGEN DEFECT IN LA2NIO4+DELTA [J].

JORGENSEN, JD ;

DABROWSKI, B ;

PEI, S ;

RICHARDS, DR ;

HINKS, DG .

PHYSICAL REVIEW B, 1989, 40 (04) :2187-2199

[7] THE MADELUNG ENERGY IN COPPER-OXIDE-BASED CERAMICS [J].

KONDO, J ;

ASAI, Y ;

NAGAI, S .

JOURNAL OF THE PHYSICAL SOCIETY OF JAPAN, 1988, 57 (12) :4334-4342

[8] CU K-EDGE XANES OF (LA1-XSRX)2CUO4, YBA2CU3OY AND RELATED CU OXIDES - VALENCE, STRUCTURE AND FINAL-STATE EFFECTS ON 1S-4P-PI AND 1S-4P-SIGMA ABSORPTION [J].

KOSUGI, N ;

KONDOH, H ;

TAJIMA, H ;

KURODA, H .

CHEMICAL PHYSICS, 1989, 135 (01) :149-160

[9] 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

[10] STRUCTURE AND OXYGEN STOICHIOMETRY FOR THE ELECTRON-DOPED CUPRATE SUPERCONDUCTOR ND1.85CE0.15CUO4-DELTA [J].

KWEI, GH ;

CHEONG, SW ;

FISK, Z ;

GARZON, FH ;

GOLDSTONE, JA ;

THOMPSON, JD .

PHYSICAL REVIEW B, 1989, 40 (13) :9370-9373

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