In-plane uniaxial pressure-induced out-of-plane antiferromagnetic moment and critical fluctuations in BaFe 2 As 2 .

Autor: Liu P; Center for Advanced Quantum Studies and Department of Physics, Beijing Normal University, 100875, Beijing, China., Klemm ML; Department of Physics and Astronomy, Rice University, Houston, TX, 77005, USA., Tian L; Center for Advanced Quantum Studies and Department of Physics, Beijing Normal University, 100875, Beijing, China., Lu X; Center for Advanced Quantum Studies and Department of Physics, Beijing Normal University, 100875, Beijing, China. luxy@bnu.edu.cn., Song Y; Department of Physics, University of California, Berkeley, CA, 94720, USA., Tam DW; Department of Physics and Astronomy, Rice University, Houston, TX, 77005, USA., Schmalzl K; Forschungszentrum Jülich GmbH, Jülich Centre for Neutron Science at ILL, 71 avenue des Martyrs, 38000, Grenoble, France., Park JT; Heinz Maier-Leibnitz Zentrum (MLZ), Technische Universität München, 85748, Garching, Germany., Li Y; Department of Physics and Astronomy, Rice University, Houston, TX, 77005, USA., Tan G; Center for Advanced Quantum Studies and Department of Physics, Beijing Normal University, 100875, Beijing, China., Su Y; Jülich Centre for Neutron Science JCNS at MLZ, Forschungszentrum Jülich GmbH, Lichtenbergstr. 1, D-85747, Garching, Germany., Bourdarot F; University Grenoble Alpes, CEA, IRIG, MEM-MDN, Grenoble, France., Zhao Y; NIST Center for Neutron Research, National Institute of Standards and Technology, Gaithersburg, MD, 20899, USA., Lynn JW; NIST Center for Neutron Research, National Institute of Standards and Technology, Gaithersburg, MD, 20899, USA., Birgeneau RJ; Department of Physics, University of California, Berkeley, CA, 94720, USA.; Materials Sciences Division, Lawrence Berkeley National Laboratory, Berkeley, CA, 94720, USA.; Department of Materials Science and Engineering, University of California, Berkeley, CA, 94720, USA., Dai P; Department of Physics and Astronomy, Rice University, Houston, TX, 77005, USA. pdai@rice.edu.
Jazyk: angličtina
Zdroj: Nature communications [Nat Commun] 2020 Nov 12; Vol. 11 (1), pp. 5728. Date of Electronic Publication: 2020 Nov 12.
DOI: 10.1038/s41467-020-19421-5
Abstrakt: A small in-plane external uniaxial pressure has been widely used as an effective method to acquire single domain iron pnictide BaFe 2 As 2 , 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 BaFe 2 As 2 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 BaFe 2 As 2 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.
Databáze: MEDLINE