Miscibility gap and possible intrinsic Griffiths phase in Sr(Fe1xMnx)2As2 crystals grown by transition metal arsenide flux

Long Chen, Cheng Cao, Hongxiang Chen, Jiangang Guo, Jie Ma, Jiangping Hu, and Gang Wang
Phys. Rev. B 103, 134509 – Published 9 April 2021
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Abstract

The crystal structure, magnetic, electronic, and thermal properties of Sr(Fe1xMnx)2As2 crystals grown by transition metal arsenide flux have been systematically investigated. A miscibility gap with x ranging from 0.4362(4) to 0.9612(9) is found in the Sr(Fe1xMnx)As2 system—for x<0.4362(4), the phase remains in the parent tetragonal structure [space group I4/mmm (No. 139)], whereas for x>0.9612(9), the phase exhibits a trigonal structure [space group P3m1 (No. 164)]. Based on our observation, the spin density wave order for x<0.0973(1) is suppressed, followed by an abnormal and broadened increase in the ordering temperature from x=0.0973(1) to x=0.2055(2). No real-space phase separation of Mn and Fe was detected for x<0.2055(2), 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 0<x<1. A phase diagram with multicritical points of Mn-doped SrFe2As2 system is established accordingly.

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  • Received 1 March 2020
  • Revised 13 January 2021
  • Accepted 4 March 2021

DOI:https://doi.org/10.1103/PhysRevB.103.134509

©2021 American Physical Society

Physics Subject Headings (PhySH)

Condensed Matter, Materials & Applied Physics

Authors & Affiliations

Long Chen1,2, Cheng Cao1,2, Hongxiang Chen1, Jiangang Guo1,3, Jie Ma4, Jiangping Hu1,3, and Gang Wang1,3,5,*

  • 1Beijing National Laboratory for Condensed Matter Physics, Institute of Physics, Chinese Academy of Sciences, Beijing 100190, China
  • 2University of Chinese Academy of Sciences, Beijing 100049, China
  • 3Songshan Lake Materials Laboratory, Dongguan, Guangdong 523808, China
  • 4Key Laboratory of Artificial Structures and Quantum Control (Ministry of Education), Shenyang National Laboratory for Materials Science, School of Physics and Astronomy, Shanghai Jiao Tong University, Shanghai 200240, China
  • 5School of Physical Sciences, University of Chinese Academy of Sciences, Beijing 100049, China

  • *gangwang@iphy.ac.cn

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Issue

Vol. 103, Iss. 13 — 1 April 2021

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