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Title: Research Update: Structural and transport properties of (Ca,La)FeAs{sub 2} single crystal

Structural and transport properties in the normal and superconducting states are investigated in a Ca{sub 0.8}La{sub 0.2}FeAs{sub 2} single crystal with T{sub c} = 27 K, belonging to the newly discovered 112 family of iron based superconductors. The transport critical current density J{sub c} for both field directions measured in a focused ion beam patterned microbridge reveals a weakly field dependent and low anisotropic behaviour with a low temperature value as high as J{sub c}(B = 0) ∼ 10{sup 5} A/cm{sup 2}. This demonstrates not only bulk superconductivity but also the potential of 112 superconductors towards applications. Interestingly, this superconducting compound undergoes a structural transition below 100 K which is evidenced by temperature-dependent X-ray diffraction measurements. Data analysis of Hall resistance and magnetoresistivity indicate that magnetotransport properties are largely dominated by an electron band, with a change of regime observed in correspondence of the onset of a structural transition. In the low temperature regime, the contribution of a hole band to transport is suggested, possibly playing a role in determining the superconducting state.
Authors:
; ; ;  [1] ;  [1] ;  [2] ;  [3] ;  [4] ;  [2] ; ;  [5] ;  [4] ; ; ;  [6] ; ;  [7] ;  [7] ;  [2]
  1. CNR-SPIN and Università di Genova, Via Dodecaneso 33, I-16146 Genova (Italy)
  2. (Japan)
  3. (AIST), Tsukuba, Ibaraki 305-8565 (Japan)
  4. National Institute for Materials Science (NIMS), Tsukuba, Ibaraki 305-0047 (Japan)
  5. Ludwig-Maximilians-Universität München, Department Chemie, Butenandtstr. 5-13, 81377 München (Germany)
  6. National Institute of Advanced Industrial Science and Technology (AIST), Tsukuba, Ibaraki 305-8565 (Japan)
  7. Department of Applied Chemistry, The University of Tokyo, Bunkyo, Tokyo 113-8656 (Japan)
Publication Date:
OSTI Identifier:
22499248
Resource Type:
Journal Article
Resource Relation:
Journal Name: APL Materials; Journal Volume: 4; Journal Issue: 2; Other Information: (c) 2016 Author(s); Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; ANISOTROPY; CRITICAL CURRENT; CURRENT DENSITY; DATA ANALYSIS; ELECTRONS; ION BEAMS; IRON; IRON ARSENIDES; MONOCRYSTALS; SUPERCONDUCTIVITY; SUPERCONDUCTORS; TEMPERATURE DEPENDENCE; X-RAY DIFFRACTION