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Effect of magnetic field on the spin resonance in FeTe0.5Se0.5 as seen via inelastic neutron scattering

Jinsheng Wen, Guangyong Xu, Zhijun Xu, Zhi Wei Lin, Qiang Li, Ying Chen, Songxue Chi, Genda Gu, and J. M. Tranquada
Phys. Rev. B 81, 100513(R) – Published 25 March 2010

Abstract

Inelastic neutron scattering and susceptibility measurements have been performed on the optimally doped Fe-based superconductor FeTe0.5Se0.5, which has a critical temperature, Tc of 14 K. The magnetic scattering at the stripe antiferromagnetic wave vector Q=(0.5,0.5) exhibits a “resonance” at 6meV, where the scattering intensity increases abruptly when cooled below Tc. In a 7-T magnetic field parallel to the ab plane, Tc is slightly reduced to 12K, based on susceptibility measurements. The resonance in the neutron-scattering measurements is also affected by the field. The resonance intensity under field cooling starts to rise at a lower temperature 12K, and the low-temperature intensity is also reduced from the zero-field value. Our results provide clear evidence for the intimate relationship between superconductivity and the resonance measured in magnetic excitations of Fe-based superconductors.

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  • Received 30 September 2009

DOI:https://doi.org/10.1103/PhysRevB.81.100513

©2010 American Physical Society

Authors & Affiliations

Jinsheng Wen1,2, Guangyong Xu1, Zhijun Xu1,3, Zhi Wei Lin1, Qiang Li1, Ying Chen4, Songxue Chi4, Genda Gu1, and J. M. Tranquada1

  • 1Condensed Matter Physics and Materials Science Department, Brookhaven National Laboratory, Upton, New York 11973, USA
  • 2Department of Materials Science and Engineering, Stony Brook University, Stony Brook, New York 11794, USA
  • 3Physics Department, The City College of New York, New York City, New York 10031, USA
  • 4NIST Center for Neutron Research, National Institute of Standards and Technology, Gaithersburg, Maryland 20899, USA

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Issue

Vol. 81, Iss. 10 — 1 March 2010

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