Elastic property of the Yb‐based heavy fermion compound YbPtSb
Elastic property of the Yb‐based heavy fermion compound YbPtSb
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镱基重费米子化合物YbPtSb的弹性性能
DOI：
10.1002/pssb.200983026
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发表时间：
2010
期刊：
影响因子：
--
通讯作者：
H. Suzuki
中科院分区：
文献类型：
--
作者：
Y. Nakanishi;K. Ito;Toru Kamiyama;R. Kashiwazaki;Kazuhisa Deto;F. Shichinomiya;M. Nakamura;M. Yoshizawa;H. Suzuki
我们报道了在YbPtSb的量子临界点(QCP)附近用最好的宏观探头之一的超声波方法测量到的弹性常数。在20 K以下，弹性常数在零温度附近有明显的弹性软化。值得注意的是，这不是居里型软化，这通常表明晶体电场效应，而是弹性常数的对数下降。此外，随着磁场的增加，弹性常数对数下降的温度范围逐渐向更高的温度移动，这表明在外场调谐下，从非费米液体到费米液体的交叉。讨论了未掺杂Yb基重费米子化合物YbPtSb的高质量单晶在常压下的NFL效应及其与磁场的关系。
We report measurements of elastic constants detected close to a quantum critical point (QCP) of YbPtSb using one of the best‐established macroscopic probes, ultrasonic method. The elastic constant shows a pronounced elastic softening toward zero temperature below around 20 K. It is noteworthy that these are not Curie type softening, which generally indicate a crystalline electric field (CEF) effect, but a logarithmic decrease of the elastic constant. Furthermore, with increasing magnetic field, the temperature range in which a logarithmic decrease of the elastic constant is observed shifts gradually to higher temperatures, suggesting a crossover from non‐Fermi liquid to Fermi liquid tuned by an external field. We discuss the first observation of NFL effects and its magnetic field dependence at ambient pressure in a high‐quality single crystal of an undoped Yb‐based heavy fermion compound: YbPtSb.