Non-Fermi-liquid behaviour at the pressure-induced antiferromagnetic to nonmagnetic transition in a heavy-fermion compound, ?
Non-Fermi-liquid behaviour at the pressure-induced antiferromagnetic to nonmagnetic transition in a heavy-fermion compound, ?
复制标题
重费米子化合物中压力诱导的反铁磁性到非磁性转变的非费米液体行为，？
DOI：
10.1088/0953-8984/8/48/006
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发表时间：
1996
期刊：
影响因子：
--
通讯作者：
T. Takabatake
中科院分区：
文献类型：
--
作者：
K. Umeo;H. Kadomatsu;T. Takabatake
综述了重费米子反铁磁体的输运、磁性和热性质的高压研究。在环境压力下，Ce离子在该化合物中的三个不等价的网站被发现是非常接近三价从XANES（X射线吸收近边结构）光谱和磁化率测量。随着压力的增加，（1.8 K在P = 0）的抑制和消失附近。在比热和交流磁化率方面，非费米液体（NFL）行为出现在0.4 GPa左右：和）。在0.62GPa以上，正常费米液体状态恢复由T的独立性和磁电阻率的依赖性。用两种模型分析了随压力的变化：具有三个Kondo温度的杂质Kondo模型和自旋涨落的自洽重整化（SCR）理论。我们发现，交叉的SCR理论是更好地描述。特征SF温度增加了20倍，为0.33 GPa，产生一个大的Gruneisen参数约0.4 GPa。
High-pressure studies of transport, magnetic and thermal properties of a heavy-fermion antiferromagnet, , are reviewed. At ambient pressure, the Ce ions in the three nonequivalent sites in this compound are found to be very close to trivalent from -XANES (x-ray absorption near-edge structure) spectra and magnetic susceptibility measurements. With increasing pressure, (1.8 K at P = 0) of is suppressed and vanishes near . Non-Fermi-liquid (NFL) behaviour appears around 0.4 GPa in both the specific heat and AC magnetic susceptibility: and ). Above 0.62 GPa, the normal Fermi liquid state recovers as indicated by the T independence of and the dependence of magnetic resistivity. The variation of with pressure is analysed in terms of two models: the impurity Kondo model with three Kondo temperatures and the self-consistent renormalization (SCR) theory of spin fluctuations (SFs). We find that the crossover in is better described by the SCR theory. The characteristic SF temperature increases by a factor of 20 for 0.33 GPa , yielding a large Gruneisen parameter around 0.4 GPa.