Enhanced low-energy magnetic excitations via suppression of the itinerancy in Fe0.98zCuzTe0.5Se0.5

Jinsheng Wen, Shichao Li, Zhijun Xu, Cheng Zhang, M. Matsuda, O. Sobolev, J. T. Park, A. D. Christianson, E. Bourret-Courchesne, Qiang Li, Genda Gu, Dung-Hai Lee, J. M. Tranquada, Guangyong Xu, and R. J. Birgeneau
Phys. Rev. B 88, 144509 – Published 21 October 2013

Abstract

We have performed resistivity and inelastic neutron scattering measurements on three samples of Fe0.98zCuzTe0.5Se0.5 with z=0, 0.02, and 0.1. It is found that with increasing Cu doping the sample's resistivity deviates progressively from that of a metal. However, in contrast to expectations that replacing Fe with Cu would suppress the magnetic correlations, the low-energy (12 meV) magnetic scattering is enhanced in strength, with greater spectral weight and longer dynamical spin-spin correlation lengths. Such enhancements can be a consequence of either enlarged local moments or a slowing down of the spin fluctuations. In either case, the localization of the conduction states induced by the Cu doping should play a critical role. Our results are not applicable to models that treat 3d transition metal dopants simply as effective electron donors.

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  • Received 25 July 2013

DOI:https://doi.org/10.1103/PhysRevB.88.144509

©2013 American Physical Society

Authors & Affiliations

Jinsheng Wen1,2,3,*, Shichao Li1, Zhijun Xu4, Cheng Zhang4, M. Matsuda5, O. Sobolev6, J. T. Park6, A. D. Christianson5, E. Bourret-Courchesne7, Qiang Li4, Genda Gu4, Dung-Hai Lee2,3, J. M. Tranquada4, Guangyong Xu4, and R. J. Birgeneau2,3,8

  • 1Center for Superconducting Physics and Materials, National Laboratory of Solid State Microstructures and Department of Physics, Nanjing University, Nanjing 210093, China
  • 2Department of Physics, University of California, Berkeley, California 94720, USA
  • 3Materials Science Division, Lawrence Berkeley National Laboratory, Berkeley, California 94720, USA
  • 4Condensed Matter Physics and Materials Science Department, Brookhaven National Laboratory, Upton, New York 11973, USA
  • 5Quantum Condensed Matter Division, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831, USA
  • 6Forschungsneutronenquelle Heinz Maier-Leibnitz (FRM-II), TU München, D-85747 Garching, Germany
  • 7Life Sciences Division, Lawrence Berkeley National Laboratory, Berkeley, California 94720, USA
  • 8Department of Materials Science and Engineering, University of California, Berkeley, California 94720, USA

  • *jwen@nju.edu.cn

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Vol. 88, Iss. 14 — 1 October 2013

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