Journal
PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA
Volume 108, Issue 38, Pages 15705-15709Publisher
NATL ACAD SCIENCES
DOI: 10.1073/pnas.1112150108
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Funding
- US Air Force Office of Scientific Research [FA9550-09-1-0656]
- Department of Energy through Oak Ridge National Laboratory [4000086706]
- Air Force Research Laboratory [Consortium for Nanomaterials for Aerospace Commerce and Technology (CONTACT)] through Rice University [R15901]
- T. L. L. Temple Foundation
- state of Texas through the Texas Center for Superconductivity at the University of Houston
- Office of Science, Office of Basic Energy Sciences, Division of Materials Sciences and Engineering, Department of Energy
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We report the detection of unusual superconductivity up to 49 K in single crystalline CaFe2As2 via electron-doping by partial replacement of Ca by rare-earth. The superconducting transition observed suggests the possible existence of two phases: one starting at 49 K, which has a low critical field < 4 Oe, and the other at 21 K, with a much higher critical field > 5 T. Our observations are in strong contrast to previous reports of doping or pressurizing layered compounds AeFe(2)As(2) (or Ae122), where Ae = Ca, Sr, or Ba. In Ae122, hole-doping has been previously observed to generate superconductivity with a transition temperature (T-c) only up to 38 K and pressurization has been reported to produce superconductivity with a T-c up to 30 K. The unusual 49 K phase detected will be discussed.
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