变磁量子临界点的通用签名：对CeRu2Si2的应用
Universal signatures of the metamagnetic quantum critical endpoint: Application to CeRu2Si2
摘要：
与变磁性转变相关的量子临界端点导致化合物的热力学量的不同签名。我们认为，无论所考虑的材料的微观细节，发散微分磁化率结合伊辛对称性的端点产生了一些特征变磁现象。在存在磁弹性耦合的情况下，发现磁化率、磁致伸缩和压缩性的对应关系，并且因此发现明显的晶体软化、发散的Grueneisen参数、热膨胀α（H）的符号变化以及比热系数γ（H）的最小值。我们说明这些签名和它们的关系上的变磁交叉在8 T的原型重费米子系统CeRu2Si2。
英文摘要：
A quantum critical endpoint related to a metamagnetic transition causes distinct signatures in the thermodynamic quantities of a compound. We argue that, irrespective of the microscopic details of the considered material, the diverging differential susceptibility combined with the Ising symmetry of the endpoint give rise to a number of characteristic metamagnetic phenomena. In the presence of a magnetoelastic coupling, one finds a correspondence of susceptibility, magnetostriction and compressibility and, as a result, a pronounced crystal softening, a diverging Grueneisen parameter, a sign change of thermal expansion alpha(H), and a minimum in the specific heat coefficient gamma(H). We illustrate these signatures and their relation on the metamagnetic crossover at 8 T in the prototypical heavy-fermion system CeRu2Si2.
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