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Title: Induced magnetic ordering in alloyed compounds based on Pauli paramagnet YCo{sub 2}

Intermetallic YCo{sub 2} compound is a Pauli exchange-enhanced paramagnet. Structural and magnetic properties melt-spun YCo{sub 2} pure and alloyed with Nb or Ti are presented. The samples crystallize in MgCu{sub 2}-type phase with lattice constant a changing from 7.223 Å for YCo{sub 2}, through 7.213 Å for Y{sub 0.9}Nb{sub 0.1}Co{sub 2} to 7.192 Å for Y{sub 0.9}Ti{sub 0.1}Co{sub 2}, where Y atoms are replaced by Nb or Ti atoms. Nanocrystalline phases can be produced by appropriate cooling rates for the solidification process. By the synthesis process free volumes, vacancies, and alloyed atoms are introduced into the YCo{sub 2} intermetallic. Ab-initio calculations have been performed to investigate the effects of substitution on the spin-split electronic band structure in the ordered YCo{sub 2}. A ferrimagnetic ground state is found in the alloyed systems with substitution on the Y-site which is energetically favorable compared to point defects on Co-sites. However, the experimentally found increased magnetic ordering in alloyed YCo{sub 2} appears to be based on microstructure effects.
Authors:
; ; ;  [1] ;  [2]
  1. Institute of Molecular Physics, Polish Academy of Sciences, M. Smoluchowskiego 17, PL-60-179 Poznań (Poland)
  2. IFW Dresden, P.O. Box 270116, D-01171 Dresden (Germany)
Publication Date:
OSTI Identifier:
22273774
Resource Type:
Journal Article
Resource Relation:
Journal Name: Journal of Applied Physics; Journal Volume: 115; Journal Issue: 17; Conference: 55. annual conference on magnetism and magnetic materials, Atlanta, GA (United States), 14-18 Nov 2010; Other Information: (c) 2014 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; ALLOY SYSTEMS; COBALT; COMPARATIVE EVALUATIONS; CRYSTALS; GROUND STATES; INTERMETALLIC COMPOUNDS; LATTICE PARAMETERS; MAGNETIC PROPERTIES; MAGNETIZATION; MICROSTRUCTURE; NANOSTRUCTURES; SOLIDIFICATION; SPIN; TITANIUM; VACANCIES; YTTRIUM