Universal signatures of the metamagnetic quantum critical endpoint: Application to CeRu2Si2

Details Universal signatures of the metamagnetic quantum critical endpoint: Application to CeRu2Si2 Universal signatures of the metamagnetic quantum critical endpoint: Application to CeRu2Si2

2009-12-18

arxiv.org/abs/0912.3546v2

Phys. Rev. B 81, 134438 (2010)

Physics

Condensed Matter

Strongly Correlated Electrons

8 pages, 6 figures, v2: changed title, minor modifications

Scientific paper

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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