Pressure effect on the low temperature specific heat and magnetic susceptibility of heavy fermion compound Ce7Ni3
Pressure effect on the low temperature specific heat and magnetic susceptibility of heavy fermion compound Ce7Ni3
复制标题
压力对重费米子化合物Ce7Ni3低温比热和磁化率的影响
DOI：
10.1016/0304-8853(95)00308-8
复制
发表时间：
1995
影响因子：
2.7
通讯作者：
H. Kadomatsu
中科院分区：
文献类型：
--
作者：
K. Umeo;K. Ishii;H. Kadomatsu
在1.5 ~ 6 K和2 ~ 20 K温度范围内测量了Ce 7 Ni 3的高压比热C（P <0.8GPa）和交流磁化率χac（P ≤ 1.0GPa）。在低温下，C和χ ac随着压力的增加而急剧下降，直到0.5GPa。χ的减小表示局部磁矩的消失。根据自旋1 ~ 2 Kondo模型的C（T）数据计算的Kondo温度TK在0.5GPa以上随压力迅速增加。δ In TK/δP的大小为4.0 GPa−1，这意味着Ce 7 Ni 3的电子格吕奈森参数非常大。
High pressure specific heat C (P < 0.8 GPa) and ac magnetic susceptibility χac(P ≤ 1.0 GPa) of Ce7Ni3have been measured in the temperature ranges from 1.5 to 6 K and from 2 to 20 K, respectively. At low temperature, C and χacdecrease steeply as pressure increases up to 0.5 GPa. The decrease in χacindicates the vanishing of the local magnetic moment. The Kondo temperature TK, evaluated from C(T) data above 0.5 GPa on the spin 1 2 Kondo model, increases rapidly with pressure. The magnitude of δ In TK/δP is 4.0 GPa−1, and implies the extraordinary large electronic Grüneisen parameter for Ce7Ni3.