...
  • 主题
高级搜索  >
历史搜索 清空历史
首页> 外文期刊>Journal of the Physical Society of Japan >Strong field quenching of the quasiparticle effective mass in heavy fermion compound YbCo_2Zn_(20)
【24h】

Strong field quenching of the quasiparticle effective mass in heavy fermion compound YbCo_2Zn_(20)

机译：重费米化合物YbCo_2Zn_（20）中准粒子有效质量的强场猝灭

获取原文
获取原文并翻译 | 示例
           
页面导航
  • 摘要
  • 著录项
  • 相似文献
  • 相关主题

摘要

We found a metamagnetic like anomaly at H_m ? 5 kOe in a heavy fermion compound YbCo_2Zn_(20) below the characteristic temperature T_(Xmax) = 0:32 K where the ac-susceptibility shows a broad peak, suggesting that an electronic state with a very low Kondo temperature is realized. Interestingly, the metamagnetic like behavior was observed as two peaks at 4.0 and 7.5 kOe at 95 mK in the magnetic field dependence of the electronic specific heat C/T. The extremely large values of the electronic specific heat coefficient γ ? 8000mJ/(K~2·mol) and A = 160μΩ·cm/K~2 in the electrical resistivity p = p_0 + AT~2 at H = 0kOe are most likely due to the very low Kondo temperature. The √A value was, however, found to be strongly reduced from √A = 12:6 (μΩ·cm/K~2)~(1/2) at 0kOe to 0.145(μΩ·cm/K~2)~(1/2) at 150kOe. Therefore, we considered that the corresponding cyclotron effective mass m _c~*, which was determined from the temperature dependence of the de Haas-van Alphen (dHvA) amplitude, is also reduced with increasing magnetic field and is in fact not large, ranging from 2 to 9m _0 at 117kOe. From the field dependence of √A and m _c~*, we estimated the cyclotron effective mass at 0kOe to be 100{500m_0, revealing the largest cyclotron mass as far as we know.
机译：我们在H_m处发现了类似超磁异常的现象？在重金属离子化合物YbCo_2Zn_（20）低于特征温度T_（Xmax）= 0:32 K的条件下为5 kOe，其中交流磁化率显示一个宽峰，这表明实现了具有非常低的近藤温度的电子状态。有趣的是，在电子比热C / T的磁场依赖性中，在4.0和7.5 kOe处的95 mK处观察到了类似亚磁的行为。电子比热系数γ≥的极大值8000mJ /（K〜2·mol）和A =160μΩ·cm / K〜2的电阻率p = p_0 + AT〜2在H = 0kOe时最有可能是由于近藤温度非常低。但是，发现√A值从0kOe时的√A= 12：6（μΩ·cm / K〜2）〜（1/2）大大降低到0.145（μΩ·cm / K〜2）〜（ 1/2）在150kOe。因此，我们认为，相应的回旋加速器有效质量m _c〜*由de Haas-van Alphen（dHvA）幅度的温度依赖性确定，并且随着磁场的增加而减小，实际上并不大，范围为2至9m _0（117kOe）。根据√A和m _c〜*的场相关性，我们估计0kOe处的回旋加速器有效质量为100 {500m_0，据我们所知揭示了最大的回旋加速器质量。

著录项

相似文献

  • 外文文献
  • 中文文献
  • 专利
获取原文

客服邮箱：kefu@zhangqiaokeyan.com

京公网安备：11010802029741号 ICP备案号：京ICP备15016152号-6 六维联合信息科技 (北京) 有限公司©版权所有

  • 客服微信

  • 服务号