GROUND-STATES OF A TRIANGULAR COPPER-OXIDE SYSTEM

被引：13

作者：

RAMIREZ, AP

CAVA, RJ

KRAJEWSKI, JJ

PECK, WF

机构：

[1] AT and T Bell Laboratories, Murray Hill, NJ 07974

来源：

PHYSICAL REVIEW B | 1994年 / 49卷 / 22期

关键词：

D O I：

10.1103/PhysRevB.49.16082

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

The low-temperature specific heat, C(T), of the Delafossite family of triangle-planar cuprates, RCuO2+delta, has been studied for R = La and Y and 0 < delta less-than-or-equal-to 2/3. Structural transformations between the hexagonal and the orthorhombic phases for R = Y appear as distinct lattice-contribution changes in C(T). Near the oxygen-ordered limit, delta = 2/3, C(T) displays a linear-in-T term of 6.5 and 1.3 mJ/mole K2 for R = La and Y, respectively. The large specific-heat enhancement and a similar enhancement of the magnetic susceptibility for R = La are interpreted in terms of strong correlations near a metal-antiferromagnetic-insulator instability.

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页码：16082 / 16085

页数：4

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