TY - JOUR
T1 - Coexistence of different electronic phases in the K 0.8Fe 1.6Se 2 superconductor
T2 - A bulk-sensitive hard x-ray spectroscopy study
AU - Simonelli, L.
AU - Saini, N. L.
AU - Sala, M. Moretti
AU - Mizuguchi, Y.
AU - Takano, Y.
AU - Takeya, H.
AU - Mizokawa, T.
AU - Monaco, G.
PY - 2012/6/7
Y1 - 2012/6/7
N2 - We have studied electronic and magnetic properties of the K 0.8Fe 1.6Se 2 superconductor by x-ray absorption and emission spectroscopy. Detailed temperature-dependent measurements along with a direct comparison with the binary FeSe system have revealed coexisting electronic phases: a majority phase with a high-spin 3 +Fe state and a minority phase with an intermediate-spin 2 +Fe state. The effect of high-temperature annealing suggests that the compressed phase with a lower-spin 2 +Fe state is directly related to the high-T c superconductivity in the title system. The results clearly underline the glassy nature of superconductivity in the electronically inhomogeneous K 0.8Fe 1.6Se 2, similar to the superconductivity in granular phases.
AB - We have studied electronic and magnetic properties of the K 0.8Fe 1.6Se 2 superconductor by x-ray absorption and emission spectroscopy. Detailed temperature-dependent measurements along with a direct comparison with the binary FeSe system have revealed coexisting electronic phases: a majority phase with a high-spin 3 +Fe state and a minority phase with an intermediate-spin 2 +Fe state. The effect of high-temperature annealing suggests that the compressed phase with a lower-spin 2 +Fe state is directly related to the high-T c superconductivity in the title system. The results clearly underline the glassy nature of superconductivity in the electronically inhomogeneous K 0.8Fe 1.6Se 2, similar to the superconductivity in granular phases.
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U2 - 10.1103/PhysRevB.85.224510
DO - 10.1103/PhysRevB.85.224510
M3 - Article
AN - SCOPUS:84862180717
SN - 1098-0121
VL - 85
JO - Physical Review B - Condensed Matter and Materials Physics
JF - Physical Review B - Condensed Matter and Materials Physics
IS - 22
M1 - 224510
ER -