In-plane uniaxial pressure-induced out-of-plane antiferromagnetic moment and critical fluctuations in BaFe2As2

Liu, Panpan; Klemm, Mason L.; Tian, Long; Lu, Xingye; Song, Yu; Tam, David W.; Schmalzl, Karin; Park, J. T.; Li, Yu; Tan, Guotai; Su, Yixi; Bourdarot, Frédéric; Zhao, Yang; Lynn, Jeffery W.; Birgeneau, Robert J.; Dai, Pengcheng

doi:10.1038/s41467-020-19421-5

In-plane uniaxial pressure-induced out-of-plane antiferromagnetic moment and critical fluctuations in BaFe₂As₂

Journal Article · Thu Nov 12 00:00:00 EST 2020 · Nature Communications

DOI:https://doi.org/10.1038/s41467-020-19421-5· OSTI ID:1763679

Liu, Panpan ^[1]; Klemm, Mason L. ^[2]; Tian, Long ^[1]; ^[1]; Song, Yu ^[3]; ^[2]; Schmalzl, Karin ^[4]; ^[5]; Li, Yu ^[2]; ^[1]; ^[6]; ^[7]; ^[8]; ^[8]; Birgeneau, Robert J. ^[9]; ^[2]

Beijing Normal Univ. (China). Center for Advanced Quantum Studies
Rice Univ., Houston, TX (United States)
Univ. of California, Berkeley, CA (United States)
Forchungszentrum Juelich GmbH, Grenoble (France). Juelich Center for Neutron Science at ILL
Technische Univ. Munchen, Garching (Germany). Heinz Maeir-Leibnitz Zentrum (MLZ)
Forchungszentrum Juelich GmbH, Garching (Germany). Juelich Center for Neutron Science JCNS at MLZ
Univ. Grenoble Alpes, Grenoble (France)
National Inst. of Standards and Technology (NIST), Gaithersburg, MD (United States). NIST Center for Neutron Research
Univ. of California, Berkeley, CA (United States); Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States)

A small in-plane external uniaxial pressure has been widely used as an effective method to acquire single domain iron pnictide BaFe₂As₂, which exhibits twin-domains without uniaxial strain below the tetragonal-to-orthorhombic structural (nematic) transition temperature T_s. Although it is generally assumed that such a pressure will not affect the intrinsic electronic/magnetic properties of the system, it is known to enhance the antiferromagnetic (AF) ordering temperature T_N ( < T_s) and create in-plane resistivity anisotropy above T_s. Here we use neutron polarization analysis to show that such a strain on BaFe₂As₂ also induces a static or quasi-static out-of-plane (c-axis) AF order and its associated critical spin fluctuations near T_N/T_s. Therefore, uniaxial pressure necessary to detwin single crystals of BaFe₂As₂ actually rotates the easy axis of the collinear AF order near T_N/T_s, and such effects due to spin-orbit coupling must be taken into account to unveil the intrinsic electronic/magnetic properties of the system.

View Accepted Manuscript (DOE)

Research Organization:: Lawrence Berkeley National Laboratory (LBNL), Berkeley, CA (United States)

Sponsoring Organization:: National Natural Science Foundation of China (NNSFC); National Science Foundation (NSF); Robert A. Welch Foundation; USDOE Office of Science (SC)

Grant/Contract Number:: AC02-05CH11231

OSTI ID:: 1763679

Journal Information:: Nature Communications, Journal Name: Nature Communications Journal Issue: 1 Vol. 11; ISSN 2041-1723

Publisher:: Nature Publishing GroupCopyright Statement

Country of Publication:: United States

Language:: English

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