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Title: Spin-glass-like behavior and negative thermal expansion in antiperovskite Mn{sub 3}Ni{sub 1−x}Cu{sub x}N compounds

The Cu-doping effect on the lattice and magnetic properties in Mn{sub 3}Ni{sub 1−x}Cu{sub x}N (x = 0, 0.3, 0.5, 0.7, 1.0) was extensively investigated. We observed that the Cu-doping at the Ni site complicated the magnetic ground states, which induced the competition of antiferromagnetic and ferromagnetic interactions. Spin-glass-like behavior, arising from possible site-randomness and competing interactions of magnetism, was observed in compounds with x = 0.3, 0.5, and 0.7, and typically discussed by means of the measurement of ac magnetic susceptibility for x = 0.7. The negative thermal expansion (NTE) behavior, due to the magnetic ordering transition, was observed in Mn{sub 3}Ni{sub 1−x}Cu{sub x}N compounds using variable temperature x-ray diffraction. It reveals that the introduction of Cu effectively broadens the temperature range displaying negative thermal expansion. The relationship between the local lattice distortion and the competing magnetic ground states might play an important role in broadening the NTE temperature range in this antiperovskite compound.
Authors:
 [1] ;  [2] ;  [2] ; ;  [1] ;  [3] ;  [2] ;  [4]
  1. Center for Condensed Matter and Materials Physics, Department of Physics, Beihang University, 100191 Beijing (China)
  2. (France)
  3. Univ. Grenoble Alpes, Inst NEEL, F-38000 Grenoble (France)
  4. State Key Laboratory of Alternate Electrical Power System with Renewable Energy Sources, School of Renewable Energy, North China Electric Power University, Beijing 102206 (China)
Publication Date:
OSTI Identifier:
22412869
Resource Type:
Journal Article
Resource Relation:
Journal Name: Journal of Applied Physics; Journal Volume: 117; Journal Issue: 21; 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; ANTIFERROMAGNETISM; CONCENTRATION RATIO; COPPER COMPOUNDS; FERROMAGNETISM; GROUND STATES; INDIUM COMPOUNDS; MAGNETIC SUSCEPTIBILITY; MAGNETIZATION; MANGANESE COMPOUNDS; NICKEL NITRIDES; RANDOMNESS; SPIN GLASS STATE; THERMAL EXPANSION; X-RAY DIFFRACTION