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Title: Effects of antiferro-ferromagnetic phase coexistence and spin fluctuations on the magnetic and related properties of NdCuSi

Polycrystalline NdCuSi is found to show co-existence of antiferromagnetic (AFM) and ferromagnetic (FM) phases at low temperatures, as revealed by neutron diffraction data. The coexistence is attributed to the competing exchange interactions and crystal field effect. The compound shows a large, low-field magnetoresistance (MR) of ∼ − 32% at 20 kOe below T{sub N} (3.1 K), which becomes ∼ − 36% at 50 kOe. The MR value at 50 kOe is found to be the highest among the RTX compounds. Magnetocaloric effect (MCE) is also found to show a large value of ∼11 J/kg K close to T{sub N}. Resistivity data show the presence of spin fluctuations, which get suppressed by the applied field. Large MR and MCE in this compound arise due to the coexistence of the two phases. The field dependencies of MR and MCE show quadratic behavior, confirming the presence of spin fluctuations.
Authors:
;  [1] ;  [2] ;  [3] ;  [4]
  1. Department of Physics, Indian Institute of Technology Bombay, Mumbai 400076 (India)
  2. Solid State Physics Division, Bhabha Atomic Research Centre, Mumbai 400085 (India)
  3. Tata Institute of Fundamental Research, Homi Bhabha Road, Mumbai 400005 (India)
  4. Helmholtz-Zentrum Berlin, Hahn-Meitner Platz 1, 14-109 Berlin (Germany)
Publication Date:
OSTI Identifier:
22415305
Resource Type:
Journal Article
Resource Relation:
Journal Name: APL materials; Journal Volume: 3; Journal Issue: 6; Other Information: (c) 2015 Author(s); Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; ANTIFERROMAGNETISM; ATOMIC FORCE MICROSCOPY; COPPER SILICIDES; CRYSTAL FIELD; EXCHANGE INTERACTIONS; FERROMAGNETISM; FLUCTUATIONS; MAGNETIC PROPERTIES; MAGNETORESISTANCE; NEODYMIUM COMPOUNDS; NEUTRON DIFFRACTION; POLYCRYSTALS; SPIN; TEMPERATURE DEPENDENCE; THERMODYNAMIC PROPERTIES