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We present specific heat measurements of 4% Rh-doped U(Ru,Rh)2Si2 at magneticfields above the proposed metamagnetic transition field Hm~34 T, revealingstriking similarities to the isotructural Ce analog CeRu2Si2, suggesting thatstrongly renormalized hybridized band models apply equally well to bothsystems. The vanishing bandwidths as H --> Hm are consistent with a putativequantum critical point close to Hm. The existence of a phase transition into anordered phase in the vicinity of Hm for 4% Rh-doped U(Ru,Rh)2Si2, but not forCeRu2Si2, is consistent with a stronger super-exchange in the case of the U 5-fsystem, with irreversible processes at the transition revealing a strongcoupling of the 5f orbitals to the lattice, most suggestive of orbital orelectric quadrupolar order.Comment: 4 pages, 4 figure

physical review letters

Quantum Critical<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mn>5</mml:mn><mml:mi>f</mml:mi></mml:math>Electrons Avoid Singularities in<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mi mathvariant="normal">U</mml:mi><mml:mo stretchy="false">(</mml:mo><mml:mi>Ru</mml:mi><mml:mo>,</mml:mo><mml:mi>Rh</mml:mi><mml:msub><mml:mo stretchy="false">)</mml:mo><mml:mn>2</mml:mn></mml:msub><mml:msub><mml:mi>Si</mml:mi><mml:mn>2</mml:mn></mml…

Quantum Critical5fElectrons Avoid Singularities inU(Ru,Rh)2Si2