In-plane uniaxial pressure-induced out-of-plane antiferromagnetic moment and critical fluctuations in BaFe2As2
- 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 Ts. 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 TN ( < Ts) and create in-plane resistivity anisotropy above Ts. 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 TN/Ts. Therefore, uniaxial pressure necessary to detwin single crystals of BaFe2As2 actually rotates the easy axis of the collinear AF order near TN/Ts, and such effects due to spin-orbit coupling must be taken into account to unveil the intrinsic electronic/magnetic properties of the system.
- Research Organization:
- Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States)
- Sponsoring Organization:
- USDOE Office of Science (SC); National Natural Science Foundation of China (NSFC); National Science Foundation (NSF); Robert A. Welch Foundation
- Grant/Contract Number:
- AC02-05CH11231; 11922402; 11734002; C-1839; DMR-1700081
- OSTI ID:
- 1763679
- Journal Information:
- Nature Communications, Vol. 11, Issue 1; ISSN 2041-1723
- Publisher:
- Nature Publishing GroupCopyright Statement
- Country of Publication:
- United States
- Language:
- English
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