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Title: Small anisotropy, weak thermal fluctuations, and high field superconductivity in Co-doped iron pnictide Ba(Fe1-xCox)2As2

Abstract

We performed high-field magnetotransport and magnetization measurements on a single crystal of the 122-phase iron pnictide Ba(Fe{sub 1-x}Co{sub x}){sub 2}As{sub 2}. Unlike the high-temperature superconductor cuprates and 1111-phase oxypnictides, Ba(Fe{sub 1-x}Co{sub x}){sub 2}As{sub 2} showed practically no broadening of the resistive transitions under magnetic fields up to 45 T. We report the temperature dependencies of the upper critical field H{sub c2} both parallel and perpendicular to the c-axis, the irreversibility field H{sub irr}{sup c}(T), and a rather unusual symmetric volume pinning force curve F{sub p}(H) suggestive of a strong pinning nanostructure. The anisotropy parameter {gamma} = H{sub c2}{sup ab}/H{sub c2}{sup c} deduced from the slopes of dH{sub c2}{sup ab}/dT = 4.9 T/K and dH{sub c2}{sup c}/dT = 2.5 T/K decreases from -2 near T{sub c}, to -1.5 at lower temperatures, much smaller than {gamma} for 1111 pnictides and high-T{sub c} cuprates.

Authors:
 [1];  [1];  [1];  [1];  [1];  [1];  [1];  [2];  [3];  [2];  [2];  [2];  [2]
  1. Florida State University
  2. ORNL
  3. Oak Ridge National Laboratory (ORNL)
Publication Date:
Research Org.:
Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
Sponsoring Org.:
USDOE Office of Science (SC)
OSTI Identifier:
1004949
DOE Contract Number:  
DE-AC05-00OR22725
Resource Type:
Journal Article
Journal Name:
Applied Physics Letters
Additional Journal Information:
Journal Volume: 94; Journal Issue: 6; Journal ID: ISSN 0003-6951
Country of Publication:
United States
Language:
English
Subject:
71 CLASSICAL AND QUANTUM MECHANICS, GENERAL PHYSICS; ANISOTROPY; CRITICAL FIELD; CUPRATES; FLUCTUATIONS; IRON; MAGNETIC FIELDS; MAGNETIC FLUX; MAGNETIZATION; MONOCRYSTALS; PNICTIDES; SUPERCONDUCTIVITY; SUPERCONDUCTORS

Citation Formats

Yamamoto, A., Jaroszynski, J., Tarantini, C., Balicas, L., Jiang, J., Gurevich, A., Larbalestier, D. C., Jin, Rongying, Sefat, A. S., McGuire, Michael A, Sales, Brian C, Christen, David K, and Mandrus, David. Small anisotropy, weak thermal fluctuations, and high field superconductivity in Co-doped iron pnictide Ba(Fe1-xCox)2As2. United States: N. p., 2009. Web. doi:10.1063/1.3081455.
Yamamoto, A., Jaroszynski, J., Tarantini, C., Balicas, L., Jiang, J., Gurevich, A., Larbalestier, D. C., Jin, Rongying, Sefat, A. S., McGuire, Michael A, Sales, Brian C, Christen, David K, & Mandrus, David. Small anisotropy, weak thermal fluctuations, and high field superconductivity in Co-doped iron pnictide Ba(Fe1-xCox)2As2. United States. doi:10.1063/1.3081455.
Yamamoto, A., Jaroszynski, J., Tarantini, C., Balicas, L., Jiang, J., Gurevich, A., Larbalestier, D. C., Jin, Rongying, Sefat, A. S., McGuire, Michael A, Sales, Brian C, Christen, David K, and Mandrus, David. Thu . "Small anisotropy, weak thermal fluctuations, and high field superconductivity in Co-doped iron pnictide Ba(Fe1-xCox)2As2". United States. doi:10.1063/1.3081455.
@article{osti_1004949,
title = {Small anisotropy, weak thermal fluctuations, and high field superconductivity in Co-doped iron pnictide Ba(Fe1-xCox)2As2},
author = {Yamamoto, A. and Jaroszynski, J. and Tarantini, C. and Balicas, L. and Jiang, J. and Gurevich, A. and Larbalestier, D. C. and Jin, Rongying and Sefat, A. S. and McGuire, Michael A and Sales, Brian C and Christen, David K and Mandrus, David},
abstractNote = {We performed high-field magnetotransport and magnetization measurements on a single crystal of the 122-phase iron pnictide Ba(Fe{sub 1-x}Co{sub x}){sub 2}As{sub 2}. Unlike the high-temperature superconductor cuprates and 1111-phase oxypnictides, Ba(Fe{sub 1-x}Co{sub x}){sub 2}As{sub 2} showed practically no broadening of the resistive transitions under magnetic fields up to 45 T. We report the temperature dependencies of the upper critical field H{sub c2} both parallel and perpendicular to the c-axis, the irreversibility field H{sub irr}{sup c}(T), and a rather unusual symmetric volume pinning force curve F{sub p}(H) suggestive of a strong pinning nanostructure. The anisotropy parameter {gamma} = H{sub c2}{sup ab}/H{sub c2}{sup c} deduced from the slopes of dH{sub c2}{sup ab}/dT = 4.9 T/K and dH{sub c2}{sup c}/dT = 2.5 T/K decreases from -2 near T{sub c}, to -1.5 at lower temperatures, much smaller than {gamma} for 1111 pnictides and high-T{sub c} cuprates.},
doi = {10.1063/1.3081455},
journal = {Applied Physics Letters},
issn = {0003-6951},
number = 6,
volume = 94,
place = {United States},
year = {2009},
month = {1}
}