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

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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]
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Database:	Engineering Source

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