Article

# Synthesis, anisotropy, and superconducting properties of LiFeAs single crystal

(Impact Factor: 3.3). 05/2010; 96(21):212508-212508-3. DOI: 10.1063/1.3435472
Source: arXiv

ABSTRACT

A LiFeAs single crystal with Tconset ∼ 19.7 K was grown in a sealed tungsten crucible using the Bridgeman method. The electrical resistivity experiments revealed a ratio of room temperature to residual resistivity of approximately 46 and 18 for the in-plane and out-of plane directions, respectively. The estimated anisotropic resistivity, γρ = ρc/ρab, was approximately 3.3 at Tconset. The upper critical fields had large Hc2∥ab and Hc2∥c values of 83.4 T and 72.5 T, respectively, and an anisotropy ratio is γH = Hc2∥ab/Hc2∥c ∼ 1.15. The high upper critical field value and small anisotropy highlight the potential use of LiFeAs in a variety of applications. The calculated critical current density (Jc) from the M-H loop is approximately 103 A/cm2

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Available from: Yoo Jang Song, Jan 21, 2014
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• "Three-dimensional (3D) ARPES experiments were performed on single crystals of stoichiometric LiFeAs with approximately T c,onset = 19.7 K [22]. ARPES measurements were performed at the SAMRAI end station of the undulator beamline 7U of UVSOR-III at the Institute for Molecular Science, Japan, using an MBS A-1 analyzer [23]. "
##### Article: Orbital-dependent electron correlation in LiFeAs revealed by angle-resolved photoemission spectroscopy
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ABSTRACT: We report on the electronic structure of the 111-type iron pnictide superconductor LiFeAs as a function of temperature using angle-resolved photoemission spectroscopy. Below approximately 50 K, both the dyz hole band at the Z point and the dxz/yz electron band at the A point shift to a higher binding energy side. However, at the high-symmetry points Z,A,Γ, and M, the remaining bands are almost independent of temperature. One of the possible scenarios for these observations is that a strong, three-dimensional orbital-dependent correlation exists in the normal state of LiFeAs in relation to short-range spin fluctuations.
Full-text · Article · Jan 2016
• ##### Article: Intrinsic scattering in pnictides: transport properties of LiFeAs single crystals
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ABSTRACT: LiFeAs is unique among the broad family of FeAs-based superconductors, because it is the only stoichiometric compound that is superconducting under ambient conditions. We studied the electrical transport on a high-quality single crystal. The resistivity shows quadratic temperature dependence at low temperature giving evidence for strong electron-electron scattering and a tendency towards saturation around room temperature. The Hall constant is negative and changes with temperature, what most probably arises from a van Hove singularity close to the Fermi energy in one of the hole-like bands. From the anisotropic magnetic-field dependence of $T_c$ we extrapolate the correlation lengths $\xi_i$ and derive a moderate anisotropy $\xi_a/\xi_c \simeq 2.2$
No preview · Article · Jan 2010
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##### Article: The Puzzle of High Temperature Superconductivity in Layered Iron Pnictides and Chalcogenides
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ABSTRACT: The response of the worldwide scientific community to the discovery in 2008 of superconductivity at Tc = 26 K in the Fe-based compound LaFeAsO_{1-x}F_x has been very enthusiastic. In short order, other Fe-based superconductors with the same or related crystal structures were discovered with Tc up to 56 K. Many experiments were carried out and theories formulated to try to understand the basic properties of these new materials and the mechanism for Tc. In this selective critical review of the experimental literature, we distill some of this extensive body of work, and discuss relationships between different types of experiments on these materials with reference to theoretical concepts and models. The experimental normal-state properties are emphasized, and within these the electronic and magnetic properties because of the likelihood of an electronic/magnetic mechanism for superconductivity in these materials. Comment: 148 two-column typeset pages, including 96 figures, 35 tables and 583 references; pdf: 8.0 MB; v2: significantly enhanced and expanded; accepted for publication in Advances in Physics
Preview · Article · May 2010 · Advances In Physics