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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…
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…
Why Does Undoped FeSe Become A High Tc Superconductor Under Pressure?
T. Imai, K. Ahilan, F. L. Ning +2
Unlike the parent phases of the iron-arsenide high Tc superconductors, undoped FeSe is not magnetically ordered and exhibits superconductivity with Tc~9K. Equally surprising is the…