Thermal Transport and Strong Mass Renormalization in NiCl(2)-4SC(NH(2))(2)

Kohama, Y.; Sologubenko, A. V.; Dilley, N. R.; Zapf, V. S.; Jaime, M.; Mydosh, J. A.; Paduan, A.; Al-Hassanieh, K. A.; Sengupta, P.; Gangadharaiah, S.; Chernyshev, A. L.; Batista, C. D.

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Thermal Transport and Strong Mass Renormalization in NiCl(2)-4SC(NH(2))(2)

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Chernyshev, A. L.
Max Planck Institute for the Physics of Complex Systems, Max Planck Society;

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Citation

Kohama, Y., Sologubenko, A. V., Dilley, N. R., Zapf, V. S., Jaime, M., Mydosh, J. A., et al. (2011). Thermal Transport and Strong Mass Renormalization in NiCl(2)-4SC(NH(2))(2). Physical Review Letters, 106(3): 037203.

Cite as: https://hdl.handle.net/11858/00-001M-0000-0029-8DCF-E

Abstract

Several quantum paramagnets exhibit magnetic-field-induced quantum phase transitions to an anti-ferromagnetic state that exists for H(c1) <= H <= H(c2). For some of these compounds, there is a significant asymmetry between the low-and high-field transitions. We present specific heat and thermal conductivity measurements in NiCl(2)-4SC(NH(2))(2), together with calculations which show that the asymmetry is caused by a strong mass renormalization due to quantum fluctuations for H <= H(c1) that are absent for H >= H(c2). We argue that the enigmatic lack of asymmetry in thermal conductivity is due to a concomitant renormalization of the impurity scattering.