Quantum fluctuations and strong mass renormalization in NiCl2-4SC(NH2)2

Details Quantum fluctuations and strong mass renormalization in NiCl2-4SC(NH2)2 Quantum fluctuations and strong mass renormalization in NiCl2-4SC(NH2)2

2010-08-31

arxiv.org/abs/1009.0053v2

Physics

Condensed Matter

Strongly Correlated Electrons

4 pages, 3 figures. Acepted for publication in Phy. Rev. Lett

Scientific paper

In a number of quantum paramagnets, magnetic field can induce a quantum phase transition to an antiferromagnetic state which exists for a range of fields Hc1 < H < Hc2. Generally, these compounds exhibit a significant asymmetry in their properties at low- and high-field transitions. Here we present detailed specific heat and thermal conductivity measurements in NiCl2-4SC(NH2)2 together with analytical and numerical results. We show that the asymmetry is caused by a strong renormalization of the effective mass of spin excitations due to quantum fluctuations for H

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