View in EDS

Pressure dependence of the magnetic structures and excitations in the giant magnetostriction compound TbCu2

Saved in:
Bibliographic Details
Title: Pressure dependence of the magnetic structures and excitations in the giant magnetostriction compound TbCu2
Authors: Rotter, M.1, Doerr, M.1 doerr@physik.tu-dresden.de, Loewenhaupt, M.1, Kockelmann, W.2,3, Bewley, R.I.2, Eccleston, R.S.2, Schneidewind, A.1, Behr, G.4
Source: Journal of Magnetism & Magnetic Materials. Mar2004, Vol. 269 Issue 3, p372. 8p.
Subjects: Magnetic fields, Intermetallic compounds, Rare earth ions, Magnetostriction
Abstract: A small shift of magnetic excitation energies is expected when applying pressure on a compound with large magnetostriction. We were able to observe these tiny shifts by inelastic neutron scattering on the giant magnetostriction (GMS) compound TbCu2. The experiments were performed at 4 and 60 K using a McWhan pressure cell. The peaks in the spectra were shifted by 0.4 meV to higher energies at the maximum pressure of 2 GPa by the magnetoelastic interaction. This strong interaction of the crystal electric field (CF) with the lattice may be liable for the GMS effect. Moreover, neutron diffraction experiments show a weak but noticeable influence of strong external pressure on the magnetic structure of TbCu2. The ambient pressure magnetic propagation vector τ=(2/3 1 0) at low temperatures is also preserved under pressure. The data indicate a non-collinear magnetic structure. In addition to the CF the exchange interaction also changes under pressure and leads to a slightly modified magnetic propagation vector in the vicinity of TN. [Copyright &y& Elsevier]
Copyright of Journal of Magnetism & Magnetic Materials is the property of Elsevier B.V. and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)
Database: Engineering Source
Description
Abstract:A small shift of magnetic excitation energies is expected when applying pressure on a compound with large magnetostriction. We were able to observe these tiny shifts by inelastic neutron scattering on the giant magnetostriction (GMS) compound TbCu2. The experiments were performed at 4 and 60 K using a McWhan pressure cell. The peaks in the spectra were shifted by 0.4 meV to higher energies at the maximum pressure of 2 GPa by the magnetoelastic interaction. This strong interaction of the crystal electric field (CF) with the lattice may be liable for the GMS effect. Moreover, neutron diffraction experiments show a weak but noticeable influence of strong external pressure on the magnetic structure of TbCu2. The ambient pressure magnetic propagation vector <f>τ=(<NU>2</NU>/3 1 0)</f> at low temperatures is also preserved under pressure. The data indicate a non-collinear magnetic structure. In addition to the CF the exchange interaction also changes under pressure and leads to a slightly modified magnetic propagation vector in the vicinity of <f>TN</f>. [Copyright &y& Elsevier]
ISSN:03048853
DOI:10.1016/S0304-8853(03)00633-4