Persistence of slow fluctuations in the overdoped regime of Ba(Fe_1-xRh_x)₂As₂ superconductors

Thesis/Dissertation · Fri Apr 15 00:00:00 EDT 2016

DOI:https://doi.org/10.2172/1326829· OSTI ID:1326829

Bossoni, L. ^[1]; Moroni, M. ^[2]; Julien, M. H. ^[3]; Canfield, Paul C. ^[4]; Mayaffre, H. ^[3]; Reyes, A. ^[5]; Halperin, W. P. ^[6]; Carretta, P. ^[2]

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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)

We present nuclear magnetic resonance evidence that very slow (1 MHz) spin fluctuations persist into the overdoped regime of Ba(Fe_1-xRh_x)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.

• Research Organization: Ames Lab., Ames, IA (United States)
• Sponsoring Organization: USDOE
• DOE Contract Number: AC02-07CH11358
• OSTI ID: 1326829
• Report Number(s): IS-J 9051
• Country of Publication: United States
• Language: English

Related Subjects

75 CONDENSED MATTER PHYSICS
SUPERCONDUCTIVITY AND SUPERFLUIDITY