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The Stoichiometry of FeSe
A. J. Williams, T. M. McQueen, R. J. Cava
Tetragonal iron selenide, FeSe, the layered parent compound of the recently discovered superconducting arsenide family, has previously been shown to be non magnetic and superconduc…
Metal - Insulator transition in Fe1.01-xCuxSe
A J Williams, T M McQueen, V Ksenofontov +2
Iron Selenide, Fe1.01Se, the layered parent compound of the recently discovered superconducting arsenide family, has previously been shown to be non magnetic and superconducting wi…
The Structural Phase Transition in FeSe (Fe1+dSe)
T. M. McQueen, A. J. Williams, P. W. Stephens +6
In this letter we show that superconducting Fe1.01Se undergoes a structural transition at 90 K from a tetragonal to an orthorhombic phase but that non-superconducting Fe1.03Se does…
Stoichiometry, Spin Fluctuations, and Superconductivity in LaNiPO
T. M. McQueen, T. Klimczuk, A. J. Williams +2
Superconductivity in LaNiPO is disrupted by small (~5%) amounts of non-stoichiometry on the lanthanum site, even though the electronic contribution to the heat capacity increases w…
Extreme Sensitivity of Superconductivity to Stoichiometry in FeSe (Fe1+dSe)
T. M. McQueen, Q. Huang, V. Ksenofontov +10
The recently discovered iron arsenide superconductors, which display superconducting transition temperatures as high as 55 K, appear to share a number of general features with high…
Tuning the Charge Density Wave and Superconductivity in CuxTaS2
K. E. Wagner, E. Morosan, Y. S. Hor +8
We report the characterization of layered, 2H-type CuxTaS2, for x between 0 and 0.12. The charge density wave (CDW), at 70 K for TaS2, is destabilized with Cu doping. The sub-1K su…