Magneto-resistance and vortex phase diagram of BaNi0.1Fe1.9As2 single crystal

doi:10.1088/1674-1056/23/12/127402

Abstract

The transition from vortex glass to a liquid phase is studied in BaNi_0.1Fe_1.9As₂ single crystal with T_c=19.4 K by magneto-resistance measurements. The resistivity curves are measured in magnetic fields in a range of 0 T–13 T for H‖c and H⊥c. Good scalings for all values of resistivity ρ(H,T) and the effective pinning potential U₀(H,T) are obtained with the modified vortex glass theory by using the critical exponents s and H₀. Phase diagrams for H‖c and H⊥c are determined based on the obtained vortex glass temperature T_g, the vortex dimensionality crossover temperature T^*, and the upper critical magnetic field H_c2. Our results suggest that both below and above 5 T, single vortex pinning co-exists with collective creep, and collective creep is dominant. There is a narrower vortex liquid region for H⊥c than for H‖c in the vortex phase diagram, which may originate from a stronger pinning force.

Keywords: Fe-based superconductor magneto-resistance pinning phase transition

Received: 23 April 2014
Revised: 12 June 2014
Accepted manuscript online:

PACS:	74.70.Xa	(Pnictides and chalcogenides)
	74.25.Uv	(Vortex phases (includes vortex lattices, vortex liquids, and vortex glasses))
	74.25.Op	(Mixed states, critical fields, and surface sheaths)

Fund:

Project supported by the Foundation of Henan Educational Committee, China (Grant No. 13B140951) and the Foundation of Henan University of Technology, China (Grant Nos. 11JCYJ15 and 2011BS030).

Corresponding Authors: Lu Jun-Chao
E-mail: jchlu@mail.ustc.edu.cn

Cite this article:

Lu Jun-Chao (鲁俊超), Yu Yi (于一), Pi Li (皮雳), Zhang Yu-Heng (张裕恒) Magneto-resistance and vortex phase diagram of BaNi_0.1Fe_1.9As₂ single crystal 2014 Chin. Phys. B 23 127402


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Magneto-resistance and vortex phase diagram of BaNi0.1Fe1.9As2 single crystal

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Magneto-resistance and vortex phase diagram of BaNi_0.1Fe_1.9As₂ single crystal