We report extensive muon-spin-rotation measurements on the lightly doped Y1−xCaxBa2Cu3O6+y compound, which allows us to disentangle the effect of disorder, controlled by random Ca2+ substitution, from that of mere doping. A three-dimensional phase diagram of lightly doped cuprates is accurately drawn. It shows a quantum critical point around which a thermally activated antiferromagnetic phase competes with superconductivity. Disorder suppresses both the competing order parameters and the quantum critical point, unveiling an underlying frozen state.

Competing orders suppressed by disorder around a hidden quantum critical point in cuprate high Tc superconductors

SANNA, SAMUELE;
2010

Abstract

We report extensive muon-spin-rotation measurements on the lightly doped Y1−xCaxBa2Cu3O6+y compound, which allows us to disentangle the effect of disorder, controlled by random Ca2+ substitution, from that of mere doping. A three-dimensional phase diagram of lightly doped cuprates is accurately drawn. It shows a quantum critical point around which a thermally activated antiferromagnetic phase competes with superconductivity. Disorder suppresses both the competing order parameters and the quantum critical point, unveiling an underlying frozen state.
Sanna, Samuele; Coneri, Francesco; Rigoldi, Americo; Concas, Giorgio; Giblin, Sean; Derenzi, Roberto
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Utilizza questo identificativo per citare o creare un link a questo documento: http://hdl.handle.net/11585/549503
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