Physics – Condensed Matter – Strongly Correlated Electrons
Scientific paper
2010-02-12
Phys. Rev. B 82 (2010) 100503(R)
Physics
Condensed Matter
Strongly Correlated Electrons
4 figures, v.2: new more intuitive 3D cuprate phase diagram
Scientific paper
10.1103/PhysRevB.82.100503
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 3D phase diagram of lightly doped cuprates is accurately drawn, showing that a thermally activated antiferromagnetic phase competes with superconductivity around a quantum critical point, hidden underneath a frozen insulating magnetic state. Disorder suppresses both competing order parameters and unveils the underlying frozen state. Doping and disorder destroy the activated magnetic phase along a line of first order phase transitions that ends at the critical point.
Concas Giorgio
Giblin S.
Renzi Roberto de
Rigoldi Coneri. F. A.
Sanna Samuele
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