Journal Article

FZJ-2019-04178

http://join2-wiki.gsi.de/foswiki/pub/Main/Artwork/join2_logo100x88.png Plaquette instability competing with bicollinear ground state in detwinned FeTe

Tam, D. W. ; Lai, H.-H. ; Hu, J.FZJ* ; Lu, X. ; Walker, H. C. ; Abernathy, D. L. ; Niedziela, J. L. ; Weber, T. ; Enderle, M. ; Su, Y.FZJ* ; Mao, Z. Q. ; Si, Q. ; Dai, P. (Corresponding author)

2019
Inst. Woodbury, NY

This record in other databases:    

Please use a persistent id in citations: http://hdl.handle.net/2128/22677  doi:10.1103/PhysRevB.100.054405

Abstract: We use inelastic neutron scattering to show that long-range spin waves arising from the static bicollinear antiferromagnetic (AF) order in FeTe, which have twofold rotational symmetry in a fully detwinned crystal, rapidly dissolve above E≈26meV into ridges of scattering with fourfold rotational symmetry and a nearly isotropic magnetic fluctuation spectrum. With increasing temperature above TN≈68K, the twofold spin waves change into broad regions of scattering with fourfold symmetry. Since the scattering patterns from plaquette magnetic order generated within a bilinear biquadratic Hamiltonian have fourfold rotational symmetry consistent with the high-energy, spin-isotropic spin waves of FeTe, we conclude that the bicollinear AF state in FeTe is quasidegenerate with plaquette magnetic order, providing evidence of the strongly frustrated nature of the local moments in the iron chalcogenide family of iron-based superconductors.

Keyword(s): Magnetic Materials (1st) ; Magnetism (2nd)

---

Contributing Institute(s):

1. JCNS-FRM-II (JCNS-FRM-II)

Research Program(s):

1. 524 - Controlling Collective States (POF3-524) (POF3-524)
2. 6212 - Quantum Condensed Matter: Magnetism, Superconductivity (POF3-621) (POF3-621)
3. 6G4 - Jülich Centre for Neutron Research (JCNS) (POF3-623) (POF3-623)
4. 6G15 - FRM II / MLZ (POF3-6G15) (POF3-6G15)

Experiment(s):

1. Measurement at external facility

Appears in the scientific report 2019

---

Database coverage:
; ; ; Clarivate Analytics Master Journal List ; Current Contents - Physical, Chemical and Earth Sciences ; Ebsco Academic Search ; IF < 5 ; JCR ; SCOPUS ; Science Citation Index ; Science Citation Index Expanded ; Web of Science Core Collection

---