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Title: In situ X-ray powder diffraction study of Ho{sub 5}Ge{sub 4}

In Ho{sub 5}Ge{sub 4} the magnetostructural transition (MST) from high temperature paramagnetic Sm{sub 5}Ge{sub 4}-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.
Authors:
;  [1] ; ;  [1] ;  [2]
  1. The Ames Laboratory, U.S. Department of Energy, Iowa State University, Ames, Iowa 50011-3020 (United States)
  2. (United States)
Publication Date:
OSTI Identifier:
22273947
Resource Type:
Journal Article
Resource Relation:
Journal Name: Journal of Applied Physics; Journal Volume: 115; Journal Issue: 17; Conference: 55. annual conference on magnetism and magnetic materials, Atlanta, GA (United States), 14-18 Nov 2010; Other Information: (c) 2014 AIP Publishing LLC; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY; ANTIFERROMAGNETISM; ATOMIC FORCE MICROSCOPY; GERMANIDES; HOLMIUM COMPOUNDS; MAGNETIC FIELDS; MAGNETOSTRICTION; MONOCLINIC LATTICES; ORTHORHOMBIC LATTICES; PARAMAGNETISM; PHASE TRANSFORMATIONS; SLABS; TEMPERATURE DEPENDENCE; X-RAY DIFFRACTION