Abstract
We report evidence for a reentrant spin glass phase in electron-doped single crystals and first traces of the superconductivity reentrance in optics. In the close-to-optimal doped and samples, two magnetic transitions are observed below the superconducting critical temperature K: the canted -type antiferromagnetic order of the ions sets in around and the spin glass behavior occurs another lower in temperature. In addition, strong evidence for an additional transition is found far below the spin glass temperature. Our extensive optical and magnetic investigations provide important insight into the interplay of local magnetism and superconductivity in these systems and elucidate the effect of the spin glass phase on the reentrant superconducting state.
3 More- Received 13 February 2017
- Revised 27 April 2017
DOI:https://doi.org/10.1103/PhysRevB.95.174522
©2017 American Physical Society