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Journal Article

Magnetic-Field Induced Quantum Critical Point in YbRh2Si2

MPS-Authors
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Gegenwart,  P.
Physics of Quantum Materials, Max Planck Institute for Chemical Physics of Solids, Max Planck Society;

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Custers,  J.
Max Planck Institute for Chemical Physics of Solids, Max Planck Society;

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Geibel,  C.
Christoph Geibel, Physics of Quantum Materials, Max Planck Institute for Chemical Physics of Solids, Max Planck Society;

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Tayama,  T.
Max Planck Institute for Chemical Physics of Solids, Max Planck Society;

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Tenya,  K.
Max Planck Institute for Chemical Physics of Solids, Max Planck Society;

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Trovarelli,  O.
Max Planck Institute for Chemical Physics of Solids, Max Planck Society;

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Steglich,  F.
Frank Steglich, Physics of Quantum Materials, Max Planck Institute for Chemical Physics of Solids, Max Planck Society;

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Citation

Gegenwart, P., Custers, J., Geibel, C., Neumaier, K., Tayama, T., Tenya, K., et al. (2002). Magnetic-Field Induced Quantum Critical Point in YbRh2Si2. Physical Review Letters, 89(5): 056402, pp. 056402-056402. doi:10.1103/PhysRevLett.89.056402.


Cite as: https://hdl.handle.net/11858/00-001M-0000-0015-311F-6
Abstract
We report low-temperature calorimetric, magnetic, and resistivity measurements on the antiferromagnetic (AF) heavy- fermion metal YbRh2Si2 ( T-N=70 mK) as a function of magnetic field B. While for fields exceeding the critical value B-c0 at which T-N-->0 the low-temperature resistivity shows an AT(2) dependence, a 1/(B-B-c0) divergence of A(B) upon reducing B to B-c0 suggests singular scattering at the whole Fermi surface and a divergence of the heavy quasiparticle mass. The observations are interpreted in terms of a new type of quantum critical point separating a weakly AF ordered from a weakly polarized heavy Landau-Fermi liquid state.