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Title: Giant magnetic coercivity in orthorhombic YNi{sub 4}Si-type SmNi{sub 4}Si compound

Magnetic properties, magnetocaloric effect and heat capacity of the YNi{sub 4}Si-type SmNi{sub 4}Si compound have been investigated. SmNi{sub 4}Si exhibits ferromagnetic transition at 17 K. Below ~9 K, the magnetic isotherms of SmNi{sub 4}Si show metamagnetic-like behavior with critical field of 20 kOe at 5 K. Heat capacity measurements of SmNi{sub 4}Si show the electronic heat capacity coefficient γ=94 mJ/(mol K{sup 2}), phonon coefficient β=0.35 mJ/(mol K{sup 4}) and Debye temperature T{sub D}=310 K. The magnetocaloric effect of SmNi{sub 4}Si is calculated in terms of isothermal magnetic entropy change which is obtained by the isothermal magnetization (ΔS{sub m}{sup magn}) and heat capacity measurements (ΔS{sub m}{sup heat}). Both ΔS{sub m}{sup magn} and ΔS{sub m}{sup heat} reach a maximum of –1.0 J/kg K at 17 K for a field change of 50 kOe and they show positive values for a field change of 20 kOe at ~9 K. Below 15 K, SmNi{sub 4}Si shows large magnetic hysteresis with considerable remanence. At 5 K it exhibits giant coercive field of 58 kOe in an applied field of 90 kOe. - Highlights: • YNi{sub 4}Si-type SmNi{sub 4}Si has Curie point at 17 K. • ΔS{sub m}{sup magn} of SmNi{sub 4}Si reaches value of –1.0more » J/kg K in 0–50 kOe near Curie point. • ΔS{sub m}{sup magn} of SmNi{sub 4}Si shows value of –0.4 and +0.8 J/kg K at 17 and 9 K in 0–20 kOe. • SmNi{sub 4}Si shows electronic heat capacity the 94 mJ/(mol K{sup 2}) and Debye T{sub D}=310 K. • SmNi{sub 4}Si shows huge magnetic hysteresis with coercive field of 58 kOe at 5 K.« less
Authors:
 [1] ;  [2]
  1. Research Center for Solid State Physics and Materials, School of Mathematics and Physics, Suzhou University of Science and Technology, Suzhou 215009 (China)
  2. Department of Chemistry, Moscow State University, Leninskie Gory, House 1, Building 3, Moscow, GSP-2 119992 (Russian Federation)
Publication Date:
OSTI Identifier:
22486814
Resource Type:
Journal Article
Resource Relation:
Journal Name: Journal of Solid State Chemistry; Journal Volume: 230; Other Information: Copyright (c) 2015 Elsevier Science B.V., Amsterdam, The Netherlands, All rights reserved.; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY; COERCIVE FORCE; CRITICAL FIELD; CURIE POINT; DEBYE TEMPERATURE; ENTROPY; FERROMAGNETISM; HYSTERESIS; ISOTHERMS; MAGNETIC PROPERTIES; MAGNETIZATION; NICKEL SILICIDES; ORTHORHOMBIC LATTICES; SAMARIUM COMPOUNDS; SPECIFIC HEAT; TEMPERATURE DEPENDENCE