LOW-TEMPERATURE SPECIFIC-HEAT OF THE Y1-XPRXBA2CU3O7-DELTA SYSTEM

被引:66
作者
GHAMATY, S [1 ]
LEE, BW [1 ]
NEUMEIER, JJ [1 ]
NIEVA, G [1 ]
MAPLE, MB [1 ]
机构
[1] UNIV CALIF SAN DIEGO,INST PURE & APPL PHYS SCI,LA JOLLA,CA 92093
来源
PHYSICAL REVIEW B | 1991年 / 43卷 / 07期
关键词
D O I
10.1103/PhysRevB.43.5430
中图分类号
T [工业技术];
学科分类号
08 ;
摘要
Low-temperature specific-heat C measurments as a function of temperature T between 0.5 and 30 K are reported for Y(1-x)Pr(x)Ba2Cu3O7-delta compounds with x = 0, 0.2, 0.3, 0.4, 0.6, 0.8, and 1.0. The Pr contribution to the specific heat of all of the samples can be described as the sum of a Pr nuclear Schottky anomaly of the form C(N)(T) = AT-2, a linear term C(L)(T) = gamma-T, and a Pr magnetic anomaly. For compounds with x less-than-or-equal-to 0.6, which are metallic and superconducting, the Pr magnetic specific-heat anomaly has the same temperature dependence as a Kondo anomaly. For the compounds with x greater-than-or-equal-to 0.6, which are metallic and superconducting, the Pr magnetic pounds with x less-than-or-equal-to 0.8, which are insulating, the magnetic specific-heat anomaly is consistent with antiferromagnetic ordering of the Pr ions with Neel temperatures T(N) of 10.9 and 15.7 K for x = 0.8 and 1.0, respectively. For T < T(N), the antiferromagnetic specific-heat anomaly has the form C(M)(T) = MT3, characteristic of three-dimensional antiferromagnetic magnons.
引用
收藏
页码:5430 / 5436
页数:7
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