Publication Date

8-1-2019

Department

Ames Laboratory; Physics and Astronomy

Campus Units

Ames Laboratory, Physics and Astronomy

OSTI ID+

1560622

Report Number

IS-J 10025

DOI

10.1103/PhysRevB.100.064515

Journal Title

Physical Review B

Volume Number

100

Issue Number

6

First Page

064515

Abstract

We present a microscopic study of nematicity and magnetism in FeSe over a wide temperature and pressure range using high-energy x-ray diffraction and time-domain Mössbauer spectroscopy. The low-temperature magnetic hyperfine field increases monotonically up to ∼ 6 GPa. The orthorhombic distortion initially decreases under increasing pressure but is stabilized at intermediate pressures by cooperative coupling to the pressure-induced magnetic order. Close to the reported maximum of the superconducting critical temperature at p = 6.8 GPa , the orthorhombic distortion suddenly disappears and a new tetragonal magnetic phase occurs. The pressure and temperature evolution of the structural and magnetic order parameters suggests that they have distinct origins.

DOE Contract Number(s)

FG02-94ER14466; AC02-07CH11358; AC02-06CH11357; EAR 11-57758; EAR-1128799; EAR 1606856

Language

en

Publisher

Iowa State University Digital Repository, Ames IA (United States)

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