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Nanoscopic coexistence of magnetic and superconducting states within the FeAs layers of CeFeAsO1−xFx

Source: Phys. Rev. B 82, 060508 (2010); doi:10.1103/PhysRevB.82.060508

Published 11 August 2010

PACS
  • 74.70.Xa
    Pnictides and chalcogenides
  • 74.25.Ha
    Magnetic properties of superconductors
  • 76.75.+i
    Muon spin rotation and relaxation in condensed matter
  • YEAR: 2010
PUBLICATION DATA
Publisher:
AIP is a member of CrossRef APS
S. Sanna,1 R. De Renzi,2 T. Shiroka,3,4 G. Lamura,5 G. Prando,1,6 P. Carretta,1 M. Putti,5 A. Martinelli,7 M. R. Cimberle,8 M. Tropeano,5 and A. Palenzona5
1Dipartimento di Fisica “A. Volta,” Unità CNISM di Pavia, I-27100 Pavia, Italy
2Dipartimento di Fisica, Unità CNISM di Parma, I-43124 Parma, Italy
3Laboratorium für Festkörperphysik, ETH-Hönggerberg, CH-8093 Zürich, Switzerland
4Paul Scherrer Institut, CH-5232 Villigen PSI, Switzerland
5CNR-SPIN, Università di Genova, via Dodecaneso 33, I-16146 Genova, Italy
6Dipartimento di Fisica “E. Amaldi,” Università di Roma3-CNISM, I-00146 Roma, Italy
7CNR-SPIN, Corso Perrone 24, I-16146 Genova, Italy
8CNR-IMEM, via Dodecaneso 33, I-16146 Genova, Italy
We report on the coexistence of magnetic and superconducting states in CeFeAsO1−xFx for x=0.06(2), characterized by transition temperatures Tm=30  K and Tc=18  K, respectively. Zero-field and transverse-field muon-spin-relaxation measurements show that below 10 K the two phases coexist within a nanoscopic scale over a large volume fraction. This result clarifies the nature of the magnetic-to-superconducting transition in the CeFeAsO1−xFx phase diagram, by ruling out the presence of a quantum critical point which was suggested by earlier studies. ©2010 The American Physical Society
History: Received 1 July 2010; revised 27 July 2010; published 11 August 2010
Permalink: http://link.aps.org/abstract/PRB/v82/e060508
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