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J. Phys. Soc. Jpn. 78 (2009) 084719 (5 pages)  |Previous Article| |Next Article|  |Table of Contents|
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Anisotropy of the Upper Critical Field in a Co-Doped BaFe2As2 Single Crystal

Mika Kano, Yoshimitsu Kohama1,2, David Graf, Fedor Balakirev1, Athena S. Sefat3, Michael A. Mcguire3, Brian C. Sales3, David Mandrus3, and Stanley W. Tozer

National High Magnetic Field Laboratory, Tallahassee, FL 83810, U.S.A.
1MPA-NHMFL, Los Alamos National Laboratory, Los Alamos, NM 87545, U.S.A.
2Materials and Structures Laboratory, Tokyo Institute of Technology, 4259 Nagatsuta-cho, Midori-ku, Yokohama 226-8503
3Materials Science and Technology Division, Oak Ridge National Laboratory, Oak Ridge, TN 37931, U.S.A.

(Received May 20, 2009; Accepted June 15, 2009; Published August 10, 2009)

The temperature dependence of the upper critical magnetic field (Hc2) in a BaFe1.84Co0.16As2 single crystal was determined via resistivity, for the inter-plane (H⊥ab) and in-plane (H∥ab) directions in pulsed and static magnetic fields of up to 60 T. Suppressing superconductivity in a pulsed magnetic field at 3He temperatures permits us to construct an Hc2–T phase diagram from quantitative Hc2(0) values and determine its behavior in low temperatures. Hc2(0) with H∥ab [Hc2|| (0)] and H⊥ab [Hc2⊥(0)] are ∼55 and ∼50 T respectively. These values are ∼1.2–1.4 times larger than the weak-coupling Pauli paramagnetic limit (Hp = 1.84 Tc), indicating that enhanced paramagnetic limiting is essential and this superconductor is unconventional. While Hc2∥ab is saturated at low temperature, Hc2 with H⊥ab (Hc2⊥) exhibits almost linear temperature dependence towards T=0 K which results in reduced anisotropy of Hc2 in low temperature. The anisotropy of Hc2 was ∼3.4 near Tc, and decreases rapidly with lower temperatures reaching ∼1.1 at T=0.7 K. ©2009 The Physical Society of Japan

KEYWORDS: Ba(Fe,Co)2As2, superconductivity, upper critical field, resistivity, anisotropy
URL: http://jpsj.ipap.jp/link?JPSJ/78/084719/
DOI: 10.1143/JPSJ.78.084719


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