Magnetism and superconductivity in La1.875Ba0.125-ySryCuO4+delta and La1.6-yNd0.4SryCuO4

被引：5

作者：

Lappas, A ^{[1
]}

Cristofolini, L ^{[1
]}

Prassides, K ^{[1
]}

Vavekis, K ^{[1
]}

Amato, A ^{[1
]}

Gygax, FN ^{[1
]}

Pinkpank, M ^{[1
]}

Schenck, A ^{[1
]}

机构：

[1] ETH ZURICH,INST PARTICLE PHYS,CH-5232 VILLIGEN,SWITZERLAND

来源：

HYPERFINE INTERACTIONS | 1997年 / 105卷 / 1-4期

关键词：

LA2-XBAXCUO4; TRANSFORMATIONS; TRANSITION;

D O I：

10.1023/A:1012666329764

中图分类号：

O64 [物理化学（理论化学）、化学物理学]; O56 [分子物理学、原子物理学];

学科分类号：

070203 ; 070304 ; 081704 ; 1406 ;

摘要：

mu(+)SR and neutron diffraction measurements show that at low temperatures in La-1.875-Ba0.125CuO4, there is phase separation into a long range ordered magnetic component of SDW-like nature, identified with the LTT phase and a superconducting component, identified with the LTO phase. Partial substitution of Pa by Sr at a fixed doping level of 1/8 leads to gradual decrease of the magnetic freezing temperature, accompanied by a decrease in the fraction of the magnetic component. The La1.875Ba0.025Sr0.100CuO4 composition exhibits freezing of the Cu electronic moments into a disordered arrangement. Excess interstitial oxygen leads to a rapid recovery of superconductivity and a marked depression of the magnetic volume fraction. Study of the LTT phase - after stabilisation with partial substitution of La by Nd - away from the 1/8 doping level, reveals no evidence of long range magnetic ordering with magnetic fluctuations surviving down to 3 K.

引用

页码：101 / 106

页数：6

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