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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.

We have performed resistivity and inelastic neutron scattering measurements on three samples of Fe0.98-zCuzTe0.5Se 0.5 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. © 2013 American Physical Society.

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