Quantum Phase Transitions in d-Wave Superconductors

Matthias Vojta; Ying Zhang; Subir Sachdev

doi:10.1103/PhysRevLett.85.4940

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Quantum Phase Transitions in d-Wave Superconductors

Matthias Vojta, Ying Zhang, Subir Sachdev

DOI 10.1103/PhysRevLett.85.4940 · Physical Review Letters

T1

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Abstract

Motivated by the strong, low temperature damping of nodal quasiparticles observed in some cuprate superconductors, we study quantum phase transitions in dx2−y2 superconductors with a spin-singlet, zero momentum, fermion bilinear order parameter. We present a complete, group-theoretic classification of such transitions into seven distinct cases (including cases with nematic order) and analyze fluctuations by the renormalization group. We find that only two, the transitions to dx2−y2+is and dx2−y2+idxy pairing, possess stable fixed points with universal damping of nodal quasiparticles; the latter leaves the gapped quasiparticles along (1,0), (0,1) essentially undamped.

Source-reported materials — not catalogue approval

Formula	Reported Tc (K)	Pressure (GPa)	Type
Bi2Sr2CaCu2O8+δ Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	—	Pressure not reported	unknown