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23 April 2024

» arxiv » 1009.0053

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Quantum fluctuations and strong mass renormalization in NiCl2-4SC(NH2)2
Y. Kohama ; A. Sologubenko ; N. R. Dilley ; V. S. Zapf ; M. Jaime ; J. Mydosh ; A. Paduan-Filho ; K. Al-Hassanieh ; P. Sengupta ; S. Gangadharaiah ; A. L. Chernyshev ; C. D. Batista ;
Date:	1 Sep 2010
Abstract:	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<Hc1 that are absent for H<Hc2.
Source:	arXiv, 1009.0053
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