Journal
PHYSICA C-SUPERCONDUCTIVITY AND ITS APPLICATIONS
Volume 468, Issue 21, Pages 2229-2232Publisher
ELSEVIER
DOI: 10.1016/j.physc.2008.06.010
Keywords
High pressure; Designer diamonds; Superconductivity; Oxypnictide
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Funding
- National Nuclear Security Administration under the Stewardship Science Academic Alliance Program through the US Department of Energy [DE-FG52-06NA26205]
- Division of Materials Sciences and Engineering, Office of Basic Energy Sciences.
- Dor the US Department of Energy, National Nuclear Security Administration under Contract DE-ACepartment of Energy (DOE) National Nuclear Security Administration (NNSA) [DE-FG52-06NA26168]
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We have performed several high-pressure resistivity experiments on the recently discovered superconductors La[O0.89F0.11]FeAs and Ce[O0.88F0.12]FeAs. At ambient pressure, these materials have superconducting onset temperatures T-c of 28 K and 44 K, respectively. While the T-c of La[O0.89F0.11]FeAs goes through a maximum between 10 and 68 kbar, in qualitative agreement with a recent report by Takahashi et al., the T-c of Ce[O0.88F0.12]FeAs decreases monotonically over the measured pressure range. At 265 kbar, the Tc of the cerium-based compound has been suppressed below 1.1 K. (C) 2008 Elsevier B.V. All rights reserved.
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