Coexistence of different electronic phases in the K 0.8Fe 1.6Se 2 superconductor: A bulk-sensitive hard x-ray spectroscopy study

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

Research output: Contribution to journalArticle

23 Citations (Scopus)

Abstract

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.

Original languageEnglish
Article number224510
JournalPhysical Review B - Condensed Matter and Materials Physics
Volume85
Issue number22
DOIs
Publication statusPublished - 2012 Jun 7
Externally publishedYes

Fingerprint

Superconductivity
x ray spectroscopy
Superconducting materials
superconductivity
Spectroscopy
X rays
electronics
Emission spectroscopy
minorities
Absorption spectroscopy
x ray absorption
Electronic properties
Magnetic properties
absorption spectroscopy
Annealing
magnetic properties
Temperature
annealing
spectroscopy
temperature

ASJC Scopus subject areas

  • Condensed Matter Physics
  • Electronic, Optical and Magnetic Materials

Cite this

Coexistence of different electronic phases in the K 0.8Fe 1.6Se 2 superconductor : A bulk-sensitive hard x-ray spectroscopy study. / Simonelli, L.; Saini, N. L.; Sala, M. Moretti; Mizuguchi, Y.; Takano, Y.; Takeya, H.; Mizokawa, Takashi; Monaco, G.

In: Physical Review B - Condensed Matter and Materials Physics, Vol. 85, No. 22, 224510, 07.06.2012.

Research output: Contribution to journalArticle

@article{6168421563694bfcb610765fd3bac53d,
title = "Coexistence of different electronic phases in the K 0.8Fe 1.6Se 2 superconductor: A bulk-sensitive hard x-ray spectroscopy study",
abstract = "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.",
author = "L. Simonelli and Saini, {N. L.} and Sala, {M. Moretti} and Y. Mizuguchi and Y. Takano and H. Takeya and Takashi Mizokawa and G. Monaco",
year = "2012",
month = "6",
day = "7",
doi = "10.1103/PhysRevB.85.224510",
language = "English",
volume = "85",
journal = "Physical Review B-Condensed Matter",
issn = "0163-1829",
publisher = "American Institute of Physics Publising LLC",
number = "22",

}

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, Takashi

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.

UR - http://www.scopus.com/inward/record.url?scp=84862180717&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=84862180717&partnerID=8YFLogxK

U2 - 10.1103/PhysRevB.85.224510

DO - 10.1103/PhysRevB.85.224510

M3 - Article

AN - SCOPUS:84862180717

VL - 85

JO - Physical Review B-Condensed Matter

JF - Physical Review B-Condensed Matter

SN - 0163-1829

IS - 22

M1 - 224510

ER -