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This content will become publicly available on May 19, 2017

Title: Ubiquitous signatures of nematic quantum criticality in optimally doped Fe-based superconductors

A key actor in the conventional theory of superconductivity is the induced interaction between electrons mediated by the exchange of virtual collective fluctuations (phonons in the case of conventional s-wave superconductors). Other collective modes that can play the same role, especially spin fluctuations, have been widely discussed in the context of high-temperature and heavy Fermion superconductors. The strength of such collective fluctuations is measured by the associated susceptibility. Here we use differential elastoresistance measurements from five optimally doped iron-based superconductors to show that divergent nematic susceptibility appears to be a generic feature in the optimal doping regime of these materials. This observation motivates consideration of the effects of nematic fluctuations on the superconducting pairing interaction in this family of compounds and possibly beyond.
Authors:
 [1] ;  [1] ;  [1] ;  [1] ;  [1]
  1. SLAC National Accelerator Lab., Menlo Park, CA (United States); Stanford Univ., CA (United States)
Publication Date:
OSTI Identifier:
1280374
Grant/Contract Number:
AC02-76SF00515
Type:
Accepted Manuscript
Journal Name:
Science
Additional Journal Information:
Journal Volume: 352; Journal Issue: 6288; Journal ID: ISSN 0036-8075
Publisher:
AAAS
Research Org:
SIMES
Sponsoring Org:
USDOE
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE