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Title: Spin pseudogap in the S = 1 2 chain material Sr 2 CuO 3 with impurities

Here, the low-energy magnetic excitation spectrum of the Heisenberg antiferromagnetic S = 1/2 chain system Sr 2CuO 3 with Ni and Ca impurities is studied by neutron spectroscopy. In all cases, a defect-induced spectral pseudogap is observed and shown to scale proportionately to the number of scattering centers in the spin chains.
Authors:
 [1] ;  [1] ;  [2] ;  [3] ;  [4] ;  [4] ;  [5] ;  [5] ;  [6] ;  [7] ;  [7] ;  [8] ;  [9] ;  [3] ;  [2] ;  [9] ;  [1]
  1. ETH Zurich, Zurich (Switzerland)
  2. Univ. Paris-Sud, Orsay Cedex (France)
  3. Univ. of Tokyo, Chiba (Japan)
  4. Lab. Leon Brillouin, Gif-sur-Yvette (France)
  5. Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
  6. Univ. Grenoble Alpes et CEA, Grenoble (France)
  7. Rutherford Appleton Lab., Oxon (United Kingdom)
  8. Forschungsneutronenquelle Heinz Maier-Leibnitz (FRM-II), Garching (Germany)
  9. Leibniz Institute for Solid State and Materials Research IFW Dresden, Dresden (Germany)
Publication Date:
Grant/Contract Number:
AC05-00OR22725
Type:
Accepted Manuscript
Journal Name:
Physical Review B
Additional Journal Information:
Journal Volume: 95; Journal Issue: 5; Journal ID: ISSN 2469-9950
Publisher:
American Physical Society (APS)
Research Org:
Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States). Spallation Neutron Source (SNS)
Sponsoring Org:
USDOE
Country of Publication:
United States
Language:
English
Subject:
75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY
OSTI Identifier:
1356910