INFRARED AND RAMAN-SPECTROSCOPIC STUDIES OF SUPERCONDUCTING ELECTROCHEMICALLY OXIDIZED LA2CUO4

被引：18

作者：

PARK, JC ^{[1
]}

HUONG, PV ^{[1
]}

REYLAFON, M ^{[1
]}

GRENIER, JC ^{[1
]}

WATTIAUX, A ^{[1
]}

POUCHARD, M ^{[1
]}

机构：

[1] UNIV BORDEAUX 1,SPECT MOLEC & CRISTALLINE LAB,CNRS,UA 124,F-33405 TALENCE,FRANCE

来源：

PHYSICA C | 1991年 / 177卷 / 4-6期

关键词：

D O I：

10.1016/0921-4534(91)90506-T

中图分类号：

O59 [应用物理学];

学科分类号：

摘要：

Infra-red spectra of electrochemically oxidized La2CuO4+delta recorded at various temperatures between 20-degrees-C to 250-degrees-C and the Raman spectrum at room temperature have been analyzed and compared with those of stoichiometric La2CuO4 and strontium substituted La1.85Sr0.15CuO4. It has been shown that oxygen enriched La2CuO4+delta exhibits a Raman spectrum characteristic of a highly distorted orthorhombic structure due to oxygen insertion. The thermal variation of the IR spectra as well as the TGA and magnetic data can be explained by an irreversible transition to stoichiometric La2CuO4 above 220-degrees-C due to oxygen release. This loss of oxygen results in a decrease of hole concentration in the material inducing a strong intensity enhancement of an IR phonon mode around 680 cm-1. It is also corroborated that the excess of oxygen is located in the La2O2 planes of the structure.

引用

页码：487 / 493

页数：7

共 23 条

[1] INFRARED REFLECTIVITY SPECTRA OF SINGLE-CRYSTALS OF LA2CUO4 [J].

BAZHENOV, AV ;

FURSOVA, TN ;

TIMOFEEV, VB ;

COOPER, AS ;

REMEIKA, JP ;

FISK, Z .

PHYSICAL REVIEW B, 1989, 40 (07) :4413-4418

[2]

BEILLE J, 1987, CR ACAD SCI II, V304, P1097

[3]

BURN T, 1987, PHYS REV B, V35, P8837

[4] BULK SUPERCONDUCTIVITY AT 36 K IN LA1.8SR0.2CUO4 [J].

CAVA, RJ ;

VANDOVER, RB ;

BATLOGG, B ;

RIETMAN, EA .

PHYSICAL REVIEW LETTERS, 1987, 58 (04) :408-410

[5] THE CRYSTAL-STRUCTURE OF SUPERCONDUCTING LA2CUO4.032 BY NEUTRON-DIFFRACTION [J].

CHAILLOUT, C ;

CHEONG, SW ;

FISK, Z ;

LEHMANN, MS ;

MAREZIO, M ;

MOROSIN, B ;

SCHIRBER, JE .

PHYSICA C, 1989, 158 (1-2) :183-191

[6] INFRARED STUDY OF ANISOTROPY IN SINGLE-CRYSTAL LA2-XSRXCUO4 [J].

COLLINS, RT ;

SCHLESINGER, Z ;

CHANDRASHEKHAR, GV ;

SHAFER, MW .

PHYSICAL REVIEW B, 1989, 39 (04) :2251-2254

[7] POLARIZED REFLECTIVITY STUDIES OF SINGLE-CRYSTAL LA2CUO4 [J].

EKLUND, PC ;

RAO, AM ;

LEHMAN, GW ;

DOLL, GL ;

DRESSELHAUS, MS ;

PICONE, PJ ;

GABBE, DR ;

JENSSEN, HP ;

DRESSELHAUS, G .

JOURNAL OF THE OPTICAL SOCIETY OF AMERICA B-OPTICAL PHYSICS, 1989, 6 (03) :389-395

[8]

FEILE R, 1988, PHYSICA C, V159, P1

[9] ANALYSIS OF INFRARED REFLECTION SPECTRA OF OXIDES OF THE LA2CUO4 HIGH-TC SUPERCONDUCTOR FAMILY IN POLARIZED-LIGHT [J].

GERVAIS, F ;

ECHEGUT, P ;

BASSAT, JM ;

ODIER, P .

PHYSICAL REVIEW B, 1988, 37 (16) :9364-9372

[10] EVIDENCE FOR SUPERCONDUCTIVITY IN LA2CUO4 [J].

GRANT, PM ;

PARKIN, SSP ;

LEE, VY ;

ENGLER, EM ;

RAMIREZ, ML ;

VAZQUEZ, JE ;

LIM, G ;

JACOWITZ, RD ;

GREENE, RL .

PHYSICAL REVIEW LETTERS, 1987, 58 (23) :2482-2485

← 1 2 3 →