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Title: Persistence of slow fluctuations in the overdoped regime of Ba(Fe1-xRhx)2As2 superconductors

We present nuclear magnetic resonance evidence that very slow (1 MHz) spin fluctuations persist into the overdoped regime of Ba(Fe1-xRhx)2As2 superconductors. Measurements of the 75As spin echo decay rate, obtained both with Hahn Echo and Carr Purcell Meiboom Gill pulse sequences, show that the slowing down of spin uctuations can be described by short-range diffusive dynamics, likely involving domain walls motions separating (π/a, 0) from (0, π/a) correlated regions. This slowing down of the fluctuations is weakly sensitive to the external magnetic field and, although fading away with doping, it extends deeply into the overdoped regime.
Authors:
 [1] ;  [2] ;  [3] ;  [4] ;  [3] ;  [5] ;  [6] ;  [2]
  1. Univ. of Pavia (Italy); Leiden Univ. (Netherlands)
  2. Univ. of Pavia (Italy)
  3. Leiden Univ. (Netherlands)
  4. Ames Lab. and Iowa State Univ., Ames, IA (United States)
  5. National High Magnetic Field Lab., Tallahassee, FL (United States)
  6. Northwestern Univ., Evanston, IL (United States)
Publication Date:
OSTI Identifier:
1326829
Report Number(s):
IS--J 9051
DOE Contract Number:
AC02-07CH11358
Resource Type:
Thesis/Dissertation
Research Org:
Ames Laboratory (AMES), Ames, IA (United States)
Sponsoring Org:
USDOE
Country of Publication:
United States
Language:
English
Subject:
75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY