Crystallographic phase transition and high-Tc superconductivity in LaFeAsO

F

T. Nomura, S. W. Kim, Yoichi Kamihara, M. Hirano, P. V. Sushko, K. Kato, M. Takata, A. L. Shluger, H. Hosono

Research output: Contribution to journalArticle

203 Citations (Scopus)

Abstract

Undoped LaFeAsO, the parent compound of the newly found high-Tc superconductor, exhibits a sharp decrease in the temperature-dependent resistivity at ∼160K. The anomaly can be suppressed by F doping with simultaneous appearance of superconductivity appears correspondingly, suggesting a close association of the anomaly with the superconductivity. We examined the crystal structures, magnetic properties and conductivity of undoped (normal conductor) and 14at.% F-doped LaFeAsO (Tc = 20K) by synchrotron x-ray diffraction (XRD), DC magnetic measurements, and abinitio calculations demonstrated that the anomaly is associated with a phase transition from tetragonal (P4/nmm) to orthorhombic (Cmma) phases at ∼160K as well as an antiferromagnetic spin ordering transition at ∼140K. These transitions can be explained by spin configuration-dependent potential energy surfaces derived from the abinitio calculations. The suppression of the transitions is ascribed to interrelated effects of geometric and electronic structural changes due to doping by F- ions.

Original languageEnglish
Article number125028
JournalSuperconductor Science and Technology
Volume21
Issue number12
DOIs
Publication statusPublished - 2008 Dec 1
Externally publishedYes

Fingerprint

Superconductivity
superconductivity
Phase transitions
Doping (additives)
Potential energy surfaces
Magnetic variables measurement
anomalies
Synchrotrons
Superconducting materials
Magnetic properties
Diffraction
Crystal structure
Association reactions
Ions
X rays
magnetic measurement
synchrotrons
x ray diffraction
conductors
direct current

ASJC Scopus subject areas

  • Electrical and Electronic Engineering
  • Condensed Matter Physics
  • Ceramics and Composites
  • Materials Chemistry
  • Metals and Alloys

Cite this

Crystallographic phase transition and high-Tc superconductivity in LaFeAsO : F. / Nomura, T.; Kim, S. W.; Kamihara, Yoichi; Hirano, M.; Sushko, P. V.; Kato, K.; Takata, M.; Shluger, A. L.; Hosono, H.

In: Superconductor Science and Technology, Vol. 21, No. 12, 125028, 01.12.2008.

Research output: Contribution to journalArticle

Nomura, T, Kim, SW, Kamihara, Y, Hirano, M, Sushko, PV, Kato, K, Takata, M, Shluger, AL & Hosono, H 2008, 'Crystallographic phase transition and high-Tc superconductivity in LaFeAsO: F', Superconductor Science and Technology, vol. 21, no. 12, 125028. https://doi.org/10.1088/0953-2048/21/12/125028
Nomura, T. ; Kim, S. W. ; Kamihara, Yoichi ; Hirano, M. ; Sushko, P. V. ; Kato, K. ; Takata, M. ; Shluger, A. L. ; Hosono, H. / Crystallographic phase transition and high-Tc superconductivity in LaFeAsO : F. In: Superconductor Science and Technology. 2008 ; Vol. 21, No. 12.
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