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Journal Article

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


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

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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
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.