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Abstract:
We present specific heat measurements of 4% Rh-doped URu2Si2 at magnetic fields around the proposed metamagnetic transition field Hm∼34 T, revealing striking similarities to the isotructural Ce analog CeRu2Si2 for H>Hm. This suggests that strongly renormalized hybridized-band models apply equally well to both systems. The vanishing bandwidths as H→Hm are consistent with a quantum-critical point close to Hm. The existence of a phase transition into an ordered phase in the vicinity of Hm for 4% Rh-doped URu2Si2, but not for CeRu2Si2, is consistent with a stronger superexchange in the case of the U 5f system. Irreversible processes at the transition indicate a strong coupling of the 5f orbitals to the lattice, most suggestive of electric quadrupolar order.
