Local-moment magnetism in superconducting FeTe0.35Se0.65 as seen via inelastic neutron scattering

Zhijun Xu, Jinsheng Wen, Guangyong Xu, Songxue Chi, Wei Ku, Genda Gu, and J. M. Tranquada
Phys. Rev. B 84, 052506 – Published 11 August 2011

Abstract

The nature of the magnetic correlations in Fe-based superconductors remains a matter of controversy. To address this issue, we use inelastic neutron scattering to characterize the strength and temperature dependence of low-energy spin fluctuations in FeTe0.35Se0.65 (Tc14 K). Integrating magnetic spectral weight for energies up to 12 meV, we find a substantial moment (M2LE0.07μB2/Fe)that shows little change with temperature, from below Tc to 300 K. Such behavior cannot be explained by the response of conduction electrons alone; states much farther from the Fermi energy must have an instantaneous local spin polarization. It raises interesting questions regarding the formation of the spin gap and resonance peak in the superconducting state.

  • Figure
  • Figure
  • Figure
  • Figure
  • Received 23 February 2011

DOI:https://doi.org/10.1103/PhysRevB.84.052506

©2011 American Physical Society

Authors & Affiliations

Zhijun Xu1,2, Jinsheng Wen1,3, Guangyong Xu1, Songxue Chi4, Wei Ku1, Genda Gu1, and J. M. Tranquada1

  • 1Condensed Matter Physics and Materials Science Department, Brookhaven National Laboratory, Upton, New York 11973, USA
  • 2Department of Physics, City College of New York, New York, New York 10033, USA
  • 3Department of Materials Science and Engineering, Stony Brook University, Stony Brook, New York 11794, USA
  • 4NIST Center for Neutron Research, National Institute of Standards and Technology, Gaithersburg, Maryland 20899, USA

Article Text (Subscription Required)

Click to Expand

References (Subscription Required)

Click to Expand
Issue

Vol. 84, Iss. 5 — 1 August 2011

Reuse & Permissions
Access Options
CHORUS

Article Available via CHORUS

Download Accepted Manuscript
Author publication services for translation and copyediting assistance advertisement

Authorization Required


×
×

Images

×

Sign up to receive regular email alerts from Physical Review B

Log In

Cancel
×

Search


Article Lookup

Paste a citation or DOI

Enter a citation
×