Anomalous magnetic torque in UBe13: Evidence for a field-induced magnetic phase transition.
Anomalous magnetic torque in UBe13: Evidence for a field-induced magnetic phase transition.
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UBe13 中的反常磁矩：场感应磁相变的证据。
DOI：
10.1103/physrevb.48.16417
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发表时间：
1993
期刊：
影响因子：
--
通讯作者：
Smith
中科院分区：
文献类型：
--
作者：
Schmiedeshoff;Fisk;Smith
在60 mK ~ 30.0 K温度和23 T磁场下，用电容式磁强计测量了重费米子超导体UBe[sub 13]单晶和多晶样品的磁力和磁矩。从磁力推导出的磁化率与使用常规技术的测量结果相当吻合。我们发现，在低温下，在3- 5 T以上的磁场中，以及在高磁场下，在7- 12 K以下的温度中，出现了对磁矩（AMT）的大的反常贡献。在低温下，AMT与超导态共存。我们建议，AMT反映了场致磁相变的存在。这种相变的存在与比热、热电势、磁阻和霍尔效应测量是一致的。
Measurements of the magnetic force and magnetic torque acting upon single-crystal and polycrystal samples of the heavy-fermion superconductor UBe[sub 13] have been made at temperatures from 60 mK to 30.0 K and in magnetic fields to 23 T using a capacitive magnetometer. The magnetic susceptibility deduced from the magnetic force is in reasonably good agreement with measurements using conventional techniques. We find that a large, anomalous contribution to the magnetic torque (AMT) appears in fields above 3--5 T at low temperature and at temperatures below about 7--12 K in high fields. The AMT coexists with the superconducting state at low temperature. We propose that the AMT reflects the existence of a field-induced magnetic phase transition. The presence of such a phase transition is consistent with specific-heat, thermopower, magnetoresistance, and Hall-effect measurements.