Persistence of slow fluctuations in the overdoped regime of Ba(Fe1−xRhx)2As2 superconductors
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Ames National Laboratory is a government-owned, contractor-operated national laboratory of the U.S. Department of Energy (DOE), operated by and located on the campus of Iowa State University in Ames, Iowa.
For more than 70 years, the Ames National Laboratory has successfully partnered with Iowa State University, and is unique among the 17 DOE laboratories in that it is physically located on the campus of a major research university. Many of the scientists and administrators at the Laboratory also hold faculty positions at the University and the Laboratory has access to both undergraduate and graduate student talent.
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Abstract
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 fluctuations 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.
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This article is published as Bossoni, L., M. Moroni, Marc-Henri Julien, H. Mayaffre, P. C. Canfield, A. Reyes, William P. Halperin, and P. Carretta. "Persistence of slow fluctuations in the overdoped regime of Ba(Fe1−xRhx)2As2 superconductors." Physical Review B 93, no. 22 (2016): 224517. DOI: 10.1103/PhysRevB.93.224517. Posted with permission.