TY - JOUR

T1 - Basic electronic properties of iron selenide under variation of structural parameters

AU - Guterding, Daniel

AU - Jeschke, Harald Olaf

AU - Valentí, Roser

N1 - Funding Information:
The authors acknowledge support from the German Research Foundation (Deutsche Forschungsgemeinschaft). Furthermore, the authors would like to thank Matthew D. Watson, Amalia I. Coldea, Steffen Backes, Andreas Kreisel, and Peter J. Hirschfeld for helpful discussions.

PY - 2017/9/6

Y1 - 2017/9/6

N2 - Since the discovery of high-temperature superconductivity in the thin-film FeSe/SrTiO3 system, iron selenide and its derivates have been intensively scrutinized. Using ab initio density functional theory calculations we review the electronic structures that could be realized in iron selenide if the structural parameters could be tuned at liberty. We calculate the momentum dependence of the susceptibility and investigate the symmetry of electron pairing within the random phase approximation. Both the susceptibility and the symmetry of electron pairing depend on the structural parameters in a nontrivial way. These results are consistent with the known experimental behavior of binary iron chalcogenides and, at the same time, reveal two promising ways of tuning superconducting transition temperatures in these materials: on one hand by expanding the iron lattice of FeSe at constant iron-selenium distance and, on the other hand, by increasing the iron-selenium distance with unchanged iron lattice.

AB - Since the discovery of high-temperature superconductivity in the thin-film FeSe/SrTiO3 system, iron selenide and its derivates have been intensively scrutinized. Using ab initio density functional theory calculations we review the electronic structures that could be realized in iron selenide if the structural parameters could be tuned at liberty. We calculate the momentum dependence of the susceptibility and investigate the symmetry of electron pairing within the random phase approximation. Both the susceptibility and the symmetry of electron pairing depend on the structural parameters in a nontrivial way. These results are consistent with the known experimental behavior of binary iron chalcogenides and, at the same time, reveal two promising ways of tuning superconducting transition temperatures in these materials: on one hand by expanding the iron lattice of FeSe at constant iron-selenium distance and, on the other hand, by increasing the iron-selenium distance with unchanged iron lattice.

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U2 - 10.1103/PhysRevB.96.125107

DO - 10.1103/PhysRevB.96.125107

M3 - Article

AN - SCOPUS:85030115758

VL - 96

JO - Physical Review B

JF - Physical Review B

SN - 2469-9950

IS - 12

M1 - 125107

ER -