Temperature dependence of iron local magnetic moment in phase-separated superconducting chalcogenide

L. Simonelli, Takashi Mizokawa, M. Moretti Sala, H. Takeya, Y. Mizuguchi, Y. Takano, G. Garbarino, G. Monaco, N. L. Saini

Research output: Contribution to journalArticle

7 Citations (Scopus)

Abstract

We have studied local magnetic moment and electronic phase separation in superconducting KxFe2-ySe2 by x-ray emission and absorption spectroscopy. Detailed temperature-dependent measurements at the Fe K-edge have revealed coexisting electronic phases and their correlation with the transport properties. By cooling down, the local magnetic moment of Fe shows a sharp drop across the superconducting transition temperature (Tc) and the coexisting phases exchange spectral weights with the low-spin state, gaining intensity at the expense of the higher-spin state. After annealing the sample across the iron-vacancy order temperature, the system does not recover the initial state and the spectral weight anomaly at Tc as well as superconductivity disappear. The results clearly underline that the coexistence of the low-spin and high-spin phases and the transitions between them provide unusual magnetic fluctuations and have a fundamental role in the superconducting mechanism of the electronically inhomogeneous KxFe2-ySe2 system.

Original languageEnglish
JournalPhysical Review B - Condensed Matter and Materials Physics
Volume90
Issue number21
DOIs
Publication statusPublished - 2014 Dec 17
Externally publishedYes

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Magnetic moments
Iron
magnetic moments
iron
temperature dependence
Emission spectroscopy
Superconductivity
Absorption spectroscopy
Phase separation
Transport properties
Superconducting transition temperature
Vacancies
Annealing
Cooling
X rays
Temperature
electronics
absorption spectroscopy
superconductivity
transport properties

ASJC Scopus subject areas

  • Condensed Matter Physics
  • Electronic, Optical and Magnetic Materials

Cite this

Temperature dependence of iron local magnetic moment in phase-separated superconducting chalcogenide. / Simonelli, L.; Mizokawa, Takashi; Sala, M. Moretti; Takeya, H.; Mizuguchi, Y.; Takano, Y.; Garbarino, G.; Monaco, G.; Saini, N. L.

In: Physical Review B - Condensed Matter and Materials Physics, Vol. 90, No. 21, 17.12.2014.

Research output: Contribution to journalArticle

Simonelli, L. ; Mizokawa, Takashi ; Sala, M. Moretti ; Takeya, H. ; Mizuguchi, Y. ; Takano, Y. ; Garbarino, G. ; Monaco, G. ; Saini, N. L. / Temperature dependence of iron local magnetic moment in phase-separated superconducting chalcogenide. In: Physical Review B - Condensed Matter and Materials Physics. 2014 ; Vol. 90, No. 21.
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AU - Takano, Y.

AU - Garbarino, G.

AU - Monaco, G.

AU - Saini, N. L.

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