PHASE-SEPARATION TO ANTIFERROMAGNETIC AND SUPERCONDUCTING DOMAINS IN OXYGEN-RICH SINGLE-CRYSTAL LA2CUO4+X - MAGNETIC AND STRUCTURAL NEUTRON-DIFFRACTION STUDIES

被引：35

作者：

VAKNIN, D

ZARESTKY, JL

JOHNSTON, DC

SCHIRBER, JE

FISK, Z

机构：

[1] IOWA STATE UNIV SCI & TECHNOL,AMES,IA 50011

[2] SANDIA NATL LABS,ALBUQUERQUE,NM 87185

[3] LOS ALAMOS NATL LAB,LOS ALAMOS,NM 87545

来源：

PHYSICAL REVIEW B | 1994年 / 49卷 / 13期

关键词：

D O I：

10.1103/PhysRevB.49.9057

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

We report on magnetic and structural neutron-diffraction studies of single-crystal La2CuO4+x versus temperature. The low-temperature diffraction data are consistent with the coexistence of two structurally related phases: nearly stoichiometric, antiferromagnetic (AF) domains, with average domain diameter approximately 500 angstrom in the CuO2 plane, and oxygen-rich, metallic, and superconducting domains. The ordered magnetic moment in the AF domains does not saturate at 10 K, and is on average, mu = (0.3 +/- 0.05)mu(B)/Cu atom. The phase-separation transition to these two phases occurs at T(PS) = 260 +/- 5 K, which is about 15 K higher than the Neel temperature, T(N) = 245 +/- 3 K. The value of T(PS) is identical within the errors with that (259 +/- 2 K) found previously from specific-heat. measurements on the same crystal. The structural properties of the single crystal are discussed and compared to those of polycrystalline oxygen-rich La2CuO4+x.

引用

页码：9057 / 9063

页数：7

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