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Title: Sample dependence of giant magnetocaloric effect in a cluster-glass system Ho{sub 5}Pd{sub 2}

In order to investigate the effect of vacancy on the magnetocaloric effect in Ho{sub 5}Pd{sub 2}, we have carried out X-ray diffraction, magnetization, and specific heat measurements in the rare-earth intermetallic compound Ho{sub 5+x}Pd{sub 2}(−0.4 ≤ x ≤ 0.4). The maximum magnetic entropy change −ΔS{sub m}{sup max}, the maximum adiabatic temperature change ΔT{sub ad}{sup max}, and the relative cooling power of Ho{sub 5+x}Pd{sub 2} take large values at x = 0−0.4 for the field change of 5 T. The paramagnetic Curie temperature θ{sub p} increases with an increase of x. This fact suggests that the enhancement of ferromagnetic coupling among the correlated spins leads to the increase of magnetocaloric effect.
Authors:
;  [1] ; ; ; ; ;  [2] ;  [2] ;  [3] ;  [4]
  1. Graduate School of Advanced Science and Technology, Tokyo Denki University, 5 Senju Asahi-cho, Adachi, Tokyo 120–8551 (Japan)
  2. National Institute for Materials Science, 1-2-1 Sengen, Tsukuba, Ibaraki 305–0047 (Japan)
  3. (Japan)
  4. School of Engineering, Tokyo Denki University, 5 Senju Asahi-cho, Adachi, Tokyo 120-8551 (Japan)
Publication Date:
OSTI Identifier:
22410050
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; CONCENTRATION RATIO; COUPLING; CURIE POINT; ENTROPY; HOLMIUM; INTERMETALLIC COMPOUNDS; MAGNETIC PROPERTIES; MAGNETIZATION; PALLADIUM; PARAMAGNETISM; SPECIFIC HEAT; SPIN; VACANCIES; X-RAY DIFFRACTION; X-RAY PHOTOELECTRON SPECTROSCOPY