Anisotropy in the Electrical Resistivity and Susceptibility of Superconducting BaFe2As2 Single Crystals

被引：228

作者：

Wang, X. F.

Wu, T.

Wu, G.

Chen, H.

Xie, Y. L.

Ying, J. J.

Yan, Y. J.

Liu, R. H.

Chen, X. H. ^{[1
]}

机构：

[1] Univ Sci & Technol China, Hefei Natl Lab Phys Sci Microscale, Hefei 230026, Anhui, Peoples R China

来源：

PHYSICAL REVIEW LETTERS | 2009年 / 102卷 / 11期

关键词：

TRANSPORT; FEAS;

D O I：

10.1103/PhysRevLett.102.117005

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

We report that sizable single crystals of BaFe2As2 have been grown with the self-flux method. Measurements and anisotropy of intrinsic transport and magnetic properties from high-quality single crystal are first presented. The resistivity anisotropy (rho(c)/rho(ab)) is as large as 150 and independent of temperature. In contrast to the susceptibility behavior observed in polycrystalline samples, no Curie-Weiss behavior is observed, and a linear-T dependent susceptibility occurs from the spin-density-wave transition temperature, (T-s), to 700 K. This result suggests that strong antiferromagnetic correlations are present well above T-s. A twofold symmetry of susceptibility in the ab plane indicates a stripelike spin structure as observed by neutron scattering. The resistivity minimum is strongly dependent on the magnetic field, suggesting that the upturn of the resistivity at low temperatures should be related to spin fluctuation.

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页数：4

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