Skip to main content
eScholarship
Open Access Publications from the University of California

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

  • Author(s): Wen, J
  • Li, S
  • Xu, Z
  • Zhang, C
  • Matsuda, M
  • Sobolev, O
  • Park, JT
  • Christianson, AD
  • Bourret-Courchesne, E
  • Li, Q
  • Gu, G
  • Lee, DH
  • Tranquada, JM
  • Xu, G
  • Birgeneau, RJ
  • et al.
Abstract

We have performed resistivity and inelastic neutron scattering measurements on three samples of Fe0.98-zCuzTe0.5Se0.5with 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. © 2013 American Physical Society.

Many UC-authored scholarly publications are freely available on this site because of the UC Academic Senate's Open Access Policy. Let us know how this access is important for you.

Main Content
Current View