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

S. Sanna, F. Coneri, A. Rigoldi, G. Concas, S. R. Giblin, and R. De Renzi
Phys. Rev. B 82, 100503(R) – Published 13 September 2010

Abstract

We report extensive muon-spin-rotation measurements on the lightly doped Y1xCaxBa2Cu3O6+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.

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  • Received 25 June 2010

DOI:https://doi.org/10.1103/PhysRevB.82.100503

©2010 American Physical Society

Authors & Affiliations

S. Sanna1,*, F. Coneri2, A. Rigoldi3, G. Concas3, S. R. Giblin4, and R. De Renzi5

  • 1Dipartimento di Fisica A. Volta and CNISM, Università di Pavia, Via Bassi, 6, I-27100 Pavia, Italy
  • 2Dipartimento di Fisica, Università di Parma, Viale G.Usberti, 7A, I-43100 Parma, Italy
  • 3Dipartimento di Fisica, Università di Cagliari and INSTM, S. P. Monserrato-Sestu km 0.700, I-09042 Monserrato (CA), Italy
  • 4ISIS Facility, Rutherford Appleton Laboratory, STFC, HSIC, Didcot OX11 0QX, United Kingdom
  • 5Dipartimento di Fisica and CNISM, Università di Parma, Viale G. Usberti, 7A, I-43100 Parma, Italy

  • *samuele.sanna@unipv.it

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Issue

Vol. 82, Iss. 10 — 1 September 2010

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