Abstract
The electronic contribution to thermal conductivity is studied in models of underdopedcuprates where the normal state has a pocketed Fermi surface with circumference∼x (hole concentration) and the superconducting state is formed by opening a gap inthe Fermi pocket. The physical consequences of the Fermi pocket are studied bycomparing the thermal conductivity computed in four different models: (1) an ordinaryd-wave superconductor with four Dirac Fermi points; (2) a normal metal with apocketed Fermi surface; (3) a superconductor formed by spinon–holon binding in thet–J model; (4) a phenomenological d-wave Bardeen–Cooper–Schrieffer (BCS) superconductorwith superconductivity formed by opening a gap on the pocketed Fermi surface. Our resultssuggest that thermal conductivity provides useful information to distinguish betweendifferent scenarios of the normal-to-superconducting transition in underdoped cuprates.
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