The fluctuation effect of BaFe1.8Co0.2As2 single crystals from reversible magnetization

Authors

Changho Choi, Department of Physics, Sogang University, Korea
SooHyun Kim, Department of Physics, Sogang University, Korea
KiYoung Choi, Department of Physics, Sogang University, Korea
Myung-Hwa Jung, Department of Physics, Sogang University, Korea
Sung-Ik Lee, Department of Physics, Sogang University, Korea
X.F Wang, University of Science & Technology of China
X.H Chen, University of Science & Technology of China
Xiaolin Wang, University of WollongongFollow

RIS ID

31556

Publication Details

Choi, C, Kim, S, Choi, K, Jung, M, Lee, S, Wang, X, Chen, X & Wang, P (2009), The fluctuation effect of BaFe1.8Co0.2As2 single crystals from reversible magnetization, Superconductor Science and Technology, 22(10), pp. 1-4.

Abstract

We present reversible magnetization measurements for applied fields in the range from 0.5 to 7 T made while varying the temperature for optimally doped BaFe_1.8Co_0.2As₂ single crystals with T_c = 23.6 K. The rounding fluctuating magnetization was observed in the reversible range of magnetization for temperatures above 18 K. This fluctuation effect is quite small compared with that in high temperature cuprate superconductors, but is still large enough for obtaining the essence of the physical properties in this iron pnictide superconductor. This reversible magnetic fluctuation follows a three-dimensional scaling form in the critical fluctuation region for fields above 0.5 T, which indicates that this iron pnictide superconductor belongs to the class of three-dimensional superconductors.