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Possible Phase Separation and Transport Properties in Large Superconducting Ca0.77La0.18Fe0.90As2 Crystals

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arxiv 1312.7731 v2 pith:43PJ2QRM submitted 2013-12-30 cond-mat.supr-con

W. Zhou , J. C. Zhuang , F. F. Yuan , X. Li , Y. Sun , X. Z. Xing , Z. X. Shi This is my paper
classification cond-mat.supr-con
keywords hallcoefficientcrystalcrystalseffectfieldlargephase
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We synthesized large superconducting single crystal Ca0.77La0.18Fe0.90As2 ('112' type) of 2 millimeter size. Scanning electron microscopy (SEM) measurements revealed that bright and dark stripes alternately spread on the surface of crystals, indicating possible existence of intrinsic phase separation. Temperature (T) -dependent resistivity, Hall effect and magneto-resistance (MR) were measured with magnetic field (H) applied to different directions of crystal. The upper critical field (Hc2) anisotropy was estimated with a moderate value around 2.8. Positive Hall coefficient (RH) and anisotropic MR were found and showed strong T-dependent feature. Below T about 100 K, abnormal behaviors appear simultaneously in resistivity derivative, Hall coefficient and MR, which indicates that other scattering mechanisms more than conventional multiband effect may exist.

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