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Title: Modulated ferromagnetic ordering and the magnetocaloric response of Eu{sub 4}PdMg

Neutron powder diffraction confirms that the primary ordering mode in Eu{sub 4}PdMg is ferromagnetic with a europium moment of 6.5(2) μ{sub B}. {sup 151}Eu Mössbauer spectroscopy shows that the unusual linear temperature dependence of the magnetisation reported for this system is an intrinsic property and not an artefact of the applied field. The form and temperature evolution of the {sup 151}Eu Mössbauer spectra strongly suggest that there is an incommensurate modulation to the magnetic structure that modifies the basic ferromagnetic order. This modulated structure may be the origin of the broad magnetocaloric response previously observed in Eu{sub 4}PdMg.
Authors:
;  [1] ; ;  [2] ;  [3] ;  [4]
  1. Physics Department and Centre for the Physics of Materials, McGill University, 3600 University Street, Montreal, Quebec H3A 2T8 (Canada)
  2. Institut für Anorganische und Analytische Chemie, Westfäliche Wilhelms-Universität Münster, Corrensstrasse 30, 48149 Münster (Germany)
  3. School of Physical, Environmental and Mathematical Sciences, UNSW Canberra at the Australian Defence Force Academy, Canberra BC, Australian Capital Territory 2610 (Australia)
  4. Canadian Neutron Beam Centre, Chalk River Laboratories, Ontario K0J 1J0 (Canada)
Publication Date:
OSTI Identifier:
22410053
Resource Type:
Journal Article
Resource Relation:
Journal Name: Journal of Applied Physics; Journal Volume: 117; Journal Issue: 17; Other Information: (c) 2015 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; ABSORPTION SPECTRA; ABSORPTION SPECTROSCOPY; EUROPIUM; EUROPIUM 151; FERROMAGNETIC MATERIALS; FERROMAGNETISM; INTERMETALLIC COMPOUNDS; MAGNESIUM; MAGNETIZATION; MODULATION; MOESSBAUER EFFECT; NEUTRON DIFFRACTION; PALLADIUM; TEMPERATURE DEPENDENCE