Theory of quantum oscillations in the vortex-liquid state of high-Tc superconductors

Sumilan Banerjee, Shizhong Zhang and Mohit Randeria ()
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Sumilan Banerjee: The Ohio State University
Shizhong Zhang: The Ohio State University
Mohit Randeria: The Ohio State University

Nature Communications, 2013, vol. 4, issue 1, 1-7

Abstract: Abstract The observation of quantum oscillations in underdoped cuprates has generated intense debate about the nature of the field-induced resistive state and its implications for the ‘normal state’ of high-Tc superconductors. Quantum oscillations suggest an underlying Fermi liquid at high magnetic fields H and low temperatures, in contrast with the pseudogap seen in zero-field, high-temperature spectroscopic experiments. Recent specific heat measurements show quantum oscillations in addition to a large field-dependent suppression of the electronic density of states. Here we present a theoretical analysis that reconciles these seemingly contradictory observations. We model the resistive state as a vortex liquid with short-range d-wave pairing correlations. We show that this state exhibits quantum oscillations, with a period determined by a Fermi surface reconstructed by a competing order parameter, in addition to a large suppression of the density of states that goes like √H at low fields.

Date: 2013
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DOI: 10.1038/ncomms2667

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