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Article
Suppression of antiferromagnetic spin fluctuations in superconducting Cr0.8 Ru0.2
Ames Laboratory Accepted Manuscripts
  • M. Ramazanoglu, Istanbul Technical University
  • Benjamin G. Ueland, Ames Laboratory
  • D. K. Pratt, National Institute of Standards and Technology
  • L. W. Harringer, National Institute of Standards and Technology
  • J. W. Lynn, National Institute of Standards and Technology
  • G. Ehlers, Oak Ridge National Laboratory
  • G. E. Granroth, Oak Ridge National Laboratory
  • Sergey L. Bud’ko, Iowa State University and Ames Laboratory
  • Paul C. Canfield, Iowa State University and Ames Laboratory
  • Deborah L. Schlagel, Ames Laboratory
  • Alan I. Goldman, Iowa State University and Ames Laboratory
  • Thomas A. Lograsso, Iowa State University and Ames Laboratory
  • Robert J. McQueeney, Iowa State University and Ames Laboratory
Publication Date
10-25-2018
Department
Ames Laboratory; Materials Science and Engineering; Physics and Astronomy
OSTI ID+
1479134
Report Number
IS-J 9807
DOI
10.1103/PhysRevB.98.134512
Journal Title
Physical Review B
Abstract

Unconventional superconductivity (SC) often develops in magnetic metals on the cusp of static antiferromagnetic (AFM) order where spin fluctuations are strong. This association is so compelling that many SC materials are labeled as unconventional by proximity to an ordered AFM state. The Cr-Ru alloy system possesses such a phase diagram [see Fig. 1(a)]. Here we use inelastic neutron scattering to show that spin fluctuations are present in a SC Cr0.8Ru0.2 alloy (Tc=1.35 K). However, the neutron spin resonance, a possible signature of unconventional SC, is not observed. Instead, data indicate a spin gap of order 2Δ (the superconducting gap) and a suppression of magnetic spectral weight at energies well above 2Δ. The suppression decreases the magnetic exchange energy, suggesting that low energy spin fluctuations oppose the formation of SC. In conjunction with other experimental evidence, a possible scenario is that conventional SC sits on the cusp of AFM order in Cr-Ru alloys.

DOE Contract Number(s)
AC02-07CH11358
Language
en
Publisher
Iowa State University Digital Repository, Ames IA (United States)
Citation Information
M. Ramazanoglu, Benjamin G. Ueland, D. K. Pratt, L. W. Harringer, et al.. "Suppression of antiferromagnetic spin fluctuations in superconducting Cr0.8 Ru0.2" Vol. 98 Iss. 13 (2018) p. 134512
Available at: http://works.bepress.com/thomas_lograsso/270/