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      Spin density wave in oxypnictide superconductors in a three-band model

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          Abstract

          The spin density wave and its temperature dependence in oxypnictide are studied in a three-band model. The spin susceptibilities with various interactions are calculated in the random phase approximation(PPA). It is found that the spin susceptibility peaks around the M point show a spin density wave(SDW) with momentum (0, \(\pi\)) and a clear stripe-like spin configuration. The intra-band Coulomb repulsion enhances remarkably the SDW but the Hund's coupling weakens it. It is shown that a new resonance appears at higher temperatures at the \(\Gamma\) point indicating the formation of a paramagnetic phase. There is a clear transition from the SDW phase to the paramagnetic phase.

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          Unconventional Superconductivity with a Sign Reversal in the Order Parameter ofLaFeAsO1−xFx

          I. Mazin, D. J. Singh, M. Johannes … (2008)
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            Magnetic Order versus superconductivity in the Iron-based layered La(O1-xFx)FeAs systems

            G. Chen, H. Mook, J. Lynn … (2008)
            In high-transition temperature (high-Tc) copper oxides, it is generally believed that antiferromagnetism plays a fundamental role in the superconducting mechanism because superconductivity occurs when mobile electrons or holes are doped into the antiferromagnetic parent compounds. The recent discovery of superconductivity in the rare-earth (R) iron-based oxide systems [RO1-xFxFeAs] has generated enormous interest because these materials are the first noncopper oxide superconductors with Tc exceeding 50 K. The parent (nonsuperconducting) LaOFeAs material is metallic but shows anomalies near 150 K in both resistivity and dc magnetic susceptibility. While optical conductivity and theoretical calculations suggest that LaOFeAs exhibits a spin-density-wave (SDW) instability that is suppressed with doping electrons to form superconductivity, there has been no direct evidence of the SDW order. Here we use neutron scattering to demonstrate that LaOFeAs undergoes an abrupt structural distortion below ~150 K, changing the symmetry from tetragonal (space group P4/nmm) to monoclinic (space group P112/n) at low temperatures, and then followed with the development of long range SDW-type antiferromagnetic order at ~134 K with a small moment but simple magnetic structure. Doping the system with flourine suppresses both the magnetic order and structural distortion in favor of superconductivity. Therefore, much like high-Tc copper oxides, the superconducting regime in these Fe-based materials occurs in close proximity to a long-range ordered antiferromagnetic ground state. Since the discovery of long
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              Superconductivity at 43 K in Samarium-arsenide Oxides \(SmFeAsO_{1-x}F_x\)

              D. Fang, H. Chen, R H Liu … (2008)
              Since the discovery of high-transition temperature (\(T_c\)) superconductivity in layered copper oxides, extensive efforts have been devoted to explore the higher \(T_c\) superconductivity. However, the \(T_c\) higher than 40 K can be obtained only in the copper oxide superconductors so far. The highest reported value of \(T_c\) for non-copper-oxide bulk superconductivity is 39 K in \(MgB_2\).\cite{jun} The \(T_c\) of about 40 K is close to or above the theoretical value predicted from BCS theory.\cite{mcmillan} Therefore, it is very significant to search for non-copper oxide superconductor with the transition temperature higher than 40 K to understand the mechanism of high-\(T_c\) superconductivity. Here we report the discovery of bulk superconductivity in samarium-arsenide oxides \(SmFeAsO_{1-x}F_x\) with ZrCuAiAs type structure. Resistivity and magnetization measurements show strong evidences for transition temperature as high as 43 K. \(SmFeAsO_{1-x}F_x\) is the first non-copper oxide superconductor with \(T_c\) higher than 40 K. The \(T_c\) higher than 40 K may be a strong argument to consider \(SmFeAsO_{1-x}F_x\) as an unconventional superconductor.
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                Author and article information

                Journal
                Publication date Created: 26 April 2010
                Article
                DOI: 10.1140/epjb/e2010-00141-3
                ArXiV ID: 1004.4570
                SO-VID: 69cfdb6d-e1e8-4e4c-ab29-0499913b6616
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                http://arxiv.org/licenses/nonexclusive-distrib/1.0/

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                Journal reference Eur. Phys. J. B 75, 205--208 (2010)
                Comments 4 pages,8 figures
                Categories cond-mat.supr-con

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