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      Anisotropy in the electrical resistivity and susceptibility of superconducting BaFe\(_{2}\)As\(_{2}\) single crystals

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          Abstract

          Sizable single crystals of \(BaFe_2As_2\) have been grown with self-flux method. The crystals are plate-like with c-axis perpendicular to the plane. The size can be as large as 3 x 5 x 0.2 \(mm^3\). The resistivity anisotropy (\(\rho_c/\rho_{ab}\)) is as large as about 150, and independent of temperature. The transport in ab plane and along c-axis direction shares the same scattering mechanism. In contrast to the magnetic behavior of polycrystalline samples, no Curie-Weiss behavior are observed, a temperature linear dependent susceptibility occurs above spin-density-wave (SDW) transition. The susceptibility behavior is very similar to that of antiferromagnetic SDW chromium. Magnetic behavior of single crystal definitely gives evidence for existence of local moment except for the contribution to susceptibility from itinerant electrons. A resistivity minimum strongly dependent on magnetic field is observed. A log(1/T) divergency, similar to that of the underdoped cuprates, happens at low temperature. Here we first present intrinsic transport and magnetic properties, and their anisotropy from high quality single crystal.

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          Author and article information

          Journal
          15 June 2008
          2009-02-25
          Article
          10.1103/PhysRevLett.102.117005
          0806.2452

          http://arxiv.org/licenses/nonexclusive-distrib/1.0/

          Custom metadata
          Phys. Rev. Lett. 102, 117005(2009)
          12 pages, 4 figures, Physical Review Letters (2009) in press
          cond-mat.supr-con cond-mat.mtrl-sci

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