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Quantum Critical 5f Electrons Avoid Singularities in U(Ru, Rh)2Si2

MPG-Autoren
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Mydosh,  J. A.
Max Planck Institute for Chemical Physics of Solids, Max Planck Society;

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Zitation

Silhanek, A. V., Harrison, N., Batista, C. D., Jaime, M., Lacerda, A., Amitsuka, H., et al. (2005). Quantum Critical 5f Electrons Avoid Singularities in U(Ru, Rh)2Si2. Physical Review Letters, 95: 026403, pp. 026403-1-026403-4. doi:10.1103/PhysRevLett.95.026403.


Zitierlink: http://hdl.handle.net/11858/00-001M-0000-0015-2C95-1
Zusammenfassung
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.