Journal Article

FZJ-2021-03224

http://join2-wiki.gsi.de/foswiki/pub/Main/Artwork/join2_logo100x88.png Spin dynamics study and experimental realization of tunable single-ion anisotropy in multiferroic Ba 2 CoGe 2 O 7 under external magnetic fields

Dutta, R. (Corresponding author)FZJ* ; Thoma, H.FZJ* ; Radelytskyi, I.FZJ* ; Schneidewind, A.FZJ* ; Kocsis, V. ; Tokunaga, Y. ; Taguchi, Y. ; Tokura, Y. ; Hutanu, V.FZJ*

2021
Inst. Woodbury, NY

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Please use a persistent id in citations: http://hdl.handle.net/2128/28653  doi:10.1103/PhysRevB.104.L020403

Abstract: We report a spin-wave study on multiferroic Ba2CoGe2O7 under magnetic fields up to 12 T using low-energyinelastic neutron scattering. In-plane transverse (T1) spin-wave modes are highly dispersive along (h00) andrather flat but strong in intensity along (30l). In addition, two dispersive electromagnon modes have beenobserved around 3.5 meV. Dispersion of the out-of-plane transverse modes (T2) under fields reveals that thesingle-ion anisotropy constant decreases with increasing magnetic field, which is consistent with the linearspin-wave theory. Our results imply that the field-dependent single-ion anisotropy plays a crucial role indetermining the characteristics of T2 and electromagnon modes in the three-dimensional anisotropic spin-wavespectrum.

Keyword(s): Basic research (1st) ; Magnetism (2nd)

Note:

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Contributing Institute(s):

1. JCNS-FRM-II (JCNS-FRM-II)
2. JCNS-4 (JCNS-4)
3. Streumethoden (JCNS-2)
4. Heinz Maier-Leibnitz Zentrum (MLZ)

Research Program(s):

1. 632 - Materials – Quantum, Complex and Functional Materials (POF4-632) (POF4-632)
2. 6G4 - Jülich Centre for Neutron Research (JCNS) (FZJ) (POF4-6G4) (POF4-6G4)

Experiment(s):

1. PANDA: Cold three axes spectrometer (SR2)

Appears in the scientific report 2021

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

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