In situ X-ray powder diffraction study of Ho5Ge4
Abstract
In Ho5Ge4 the magnetostructural transition (MST) from high temperature paramagnetic Sm5Ge4-type (O-II type) orthorhombic structure to a new low temperature antiferromagnetic (AFM) monoclinic structure (Mβ-structure; the distortion occurs in the ac-plane) results in discontinuities of 400, 400, and 300 ppm along a, b, and c axes, respectively. During MST the unit cell volume exhibits discontinuity of 1000 ppm, and changes in both inter and intra slab bonds are less than 2%. In the AFM state the application of 35 kOe magnetic field leads to a partial reconstruction of the high temperature O-II structure, which is accompanied with a large magnetostriction. The strain energy associated with magnetostriction effects leads to an incomplete field driven MST in the magnetically ordered state.
- Publication:
-
Journal of Applied Physics
- Pub Date:
- May 2014
- DOI:
- 10.1063/1.4853215
- Bibcode:
- 2014JAP...115qE105S