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Angular dependence of pinning potential, upper critical field, and irreversibility field in underdoped BaFe Co As single crystal

Applied Physics Letters, ISSN: 0003-6951, Vol: 100, Issue: 10
2012
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Underdoped BaFe Co As single crystal was studied by angular dependence of magneto-transport at fields up to 13 T over a wide range of temperature. Our results show that pinning potential, U , decreases slightly for 45 and remains constant for 45, while the upper critical field, H , and the irreversibility field, H , increase with . According to anisotropic Ginzburg-Landau theory, the anisotropy was determined by scaling the resistivity under different magnetic fields below the superconducting critical temperature, T . Anisotropy, , in the underdoped crystal is found to be temperature dependent and decreases from 2.1 to 1.8 for as T is reduced from 17 to 12.5 K. © 2012 American Institute of Physics.

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