Metamagnetic transition in UPt 3 studied by high-field magnetization and de Haas-van Alphen experiments
Metamagnetic transition in UPt 3 studied by high-field magnetization and de Haas-van Alphen experiments
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通过高场磁化和 de Haas-van Alphen 实验研究 UPt 3 中的变磁转变
DOI：
10.1103/physrevb.60.9248
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发表时间：
1999
影响因子：
3.7
通讯作者：
Y. Ōnuki
中科院分区：
文献类型：
--
作者：
K. Sugiyama;M. Nakashima;D. Aoki;K. Kindo;N. Kimura;H. Aoki;T. Komatsubara;S. Uji;Y. Haga;E. Yamamoto;H. Harima;Y. Ōnuki
重费米子超导体UPT3在20T左右发生了变磁相变。高场磁化实验表明，这种相变持续到30K左右，接近特征温度Tχmax(≃20K)，此时的磁化率随温度变化有一个极大值。在Tχmax以下，磁涨落幅度增大，在低温下形成重费米子态。这反映在回旋加速器有效质量的增长上。由De Haas-van Alphen实验测得的主带37电子费米面的质量随着电场的增加而显著增加，从12.5T时的6.3m0增加到18T时的8.6m0，这与电子比热系数与场的关系是一致的。
A heavy fermion superconductor UPt 3 exhibits the metamagnetic transition at about 20 T. High-field magnetization experiments reveal that this transition persists up to about 30 K, which is close to the characteristic temperature T χ max (≃ 20 K) where the magnetic susceptibility has a maximum in the temperature dependence. Below T χ max, the magnitude of magnetic fluctuations increases and forms the heavy fermion state at low temperatures. This is reflected in the growth of the cyclotron effective mass. The mass in the main band 37-electron Fermi surface, which was determined by the de Haas–van Alphen experiments, is strongly enhanced with increasing the field, from 6 3 m 0 at 12.5 T to 8 6 m 0 at 18 T. This is consistent with the field dependence of the electronic specific heat coefficient.