Superconductivity in iron compounds
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"Superconductivity in iron compounds..." refers background in this paper
...One is that just like the discovery of superconductivity at 35 K in Ba doped La2CuO4 (Bednorz and Müller, 1986) it led to the almost immediate further discovery of even higher Tc materials, with the current record 56 K observed in Gd0:8Th0:2FeAsO (C. Wang et al., 2008), Sr0:5Sm0:5FeAsF (G. Wu et…...
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...The path to this higher transition temperature was also similar to that in the high Tc cuprates, where pressure experiments (Chu et al., 1987) first increased the Tc in Ba doped La2CuO4 from 35 to 53 K....
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...One is that just like the discovery of superconductivity at 35 K in Ba doped La2CuO4 (Bednorz and Müller, 1986) it led to the almost immediate further discovery of even higher Tc materials, with the current record 56 K observed in Gd0:8Th0:2FeAsO (C. Wang et al., 2008), Sr0:5Sm0:5FeAsF (G. Wu et al., 2009) and Ca0:4Nd0:6FeAsF (Cheng et al., 2009)....
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6,643 citations
"Superconductivity in iron compounds..." refers background or methods in this paper
...Kamihara et al. (2008) in their discovery of superconductivity in LaFeAsO1 xFx reported that the undoped LaFeAsO resistivity was approximately temperature independent at 5 m cm, with an anomaly at 150 K and an upturn below 100 K....
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...The original discovery of superconductivity at 26 K by Kamihara et al. (2008) was in LaFeO1 xFx, which has the tetragonal, tP8 (‘‘t’’ means tetragonal, ‘‘P’’ means ‘‘primitive’’ or no atoms in either the body or face centers, 8 atoms per unit cell) ZrCuSiAs ( ¼ prototypical compound) structure with…...
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...Both these transitions are suppressed in the discovery compound of Kamihara et al. (2008), LaFeAsO0:92F0:08, Tc ¼ 26 K. TSDW and TS are Rev. Mod....
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...B.2. a. Tc versus doping Electron doping LnFeAsO (Ln ¼ La, Dy, Tb, Gd, Sm, Nd, Pr, Ce), via either the discovery method (F partially replacing O) of Kamihara et al. (2008) where superconductivity starts at 4% F doping or via oxygen deficiency achieved with high 130 K for optimally doped x ¼ 0:2 vs…...
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...Kamihara et al. (2008) reported that the susceptibility of LaFeAsO is about 0:4 memu=mole and roughly temperature independent below room temperature except for the 150 K anomaly and an upturn below 25 K. McGuire et al. (2008), with an expanded set of data for of LaFeAsO, showed that increases with…...
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"Superconductivity in iron compounds..." refers methods in this paper
...This was followed by ‘‘chemical pressure’’ experiments where Tc was raised to 93 K (Wu et al., 1987) by replacing La with the smaller Y to make a multiphase sample containing YBa2Cu3O7 ....
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"Superconductivity in iron compounds..." refers background in this paper
...The next iron-containing superconductor structure includes members of the MFe2As2 (‘‘122’’) family [of which there are over 450 distinct compounds, (Villars and Calvert, 1985)], where Rotter, Tegel, and Johrendt (2008) discovered Tc ¼ 38 K in K doped BaFe2As2, Ba0:6K0:4Fe2As2....
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