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Caglieris, F.; Sala, A.; Fujioka, M.; Hummel, F.; Pallecchi, I.; Lamura, G.; Johrendt, D.; Takano, Y.; Ishida, S.; Iyo, A.; Eisaki, H.; Ogino, H.; Yakita, H.; Shimoyama, J.; Putti, M. (2016): Research Update: Structural and transport properties of (Ca,La)FeAs2 single crystal. In: APL Materials, Vol. 4, Nr. 2, 020702


Structural and transport properties in the normal and superconducting states are investigated in a Ca0.8La0.2FeAs2 single crystal with T-c = 27 K, belonging to the newly discovered 112 family of iron based superconductors. The transport critical current density J(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(c)(B = 0) similar to 10(5) A/cm(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. (C) 2016 Author(s).