Field-induced thermal metal-to-insulator transition in underdoped LSCO
D. G. Hawthorn, R. W. Hill, F. Ronning, Mike Sutherland, Etienne Boaknin, M. A. Tanatar, Johnpierre Paglione, S. Wakimoto, H. Zhang, Louis Taillefer
Abstract
The transport of heat and charge in cuprates was measured in undoped and heavily-underdoped single crystal La2-xSrxCuO4+delta (LSCO). In underdoped LSCO, the thermal conductivity is found to decrease with increasing magnetic field in the T --> 0 limit, in striking contrast to the increase observed in all superconductors, including cuprates at higher doping. The suppression of superconductivity with magnetic field shows that a novel thermal metal-to-insulator transition occurs upon going from the superconducting state to the field-induced normal state.
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