Abstract
The crystal structure, magnetic, electronic, and thermal properties of crystals grown by transition metal arsenide flux have been systematically investigated. A miscibility gap with ranging from 0.4362(4) to 0.9612(9) is found in the system—for , the phase remains in the parent tetragonal structure [space group (No. 139)], whereas for , the phase exhibits a trigonal structure [space group (No. 164)]. Based on our observation, the spin density wave order for is suppressed, followed by an abnormal and broadened increase in the ordering temperature from to . No real-space phase separation of Mn and Fe was detected for , indicating that the broadened increase in ordering temperature is attributable to a possibly intrinsic Griffiths phase. No superconducting signal was observed down to 2 K in the whole composition range with . A phase diagram with multicritical points of Mn-doped system is established accordingly.
- Received 1 March 2020
- Revised 13 January 2021
- Accepted 4 March 2021
DOI:https://doi.org/10.1103/PhysRevB.103.134509
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