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Title: Crossover from antiferro-to-ferromagnetism on substitution of Co by V in RE(Co{sub 1-x}V{sub x}){sub 2}Si{sub 2} (0 ≤ x ≤ 0.35)

In PrCo{sub 2}Si{sub 2} and NdCo{sub 2}Si{sub 2}, Co has been partially substituted by V. Vanadium having a larger atomic radius than cobalt, the substitution results in a negative pressure affecting the magnetic properties of the compound. The samples RE(Co{sub 1-x}V{sub x}){sub 2}Si{sub 2} (RE = Pr, Nd; x = 0, 0.20, 0.35) were prepared by melting the corresponding elements in arc furnace and characterized using x-ray diffraction. Magnetometric measurements show that the parent compounds PrCo{sub 2}Si{sub 2} and NdCo{sub 2}Si{sub 2} are antiferromagnetic, as reported. With doping, ferrimagnetic behaviour is observed from temperature dependence of inverse susceptibility at about 50 K. At lower than 30 K, the magnetizations tend to saturate at high fields. From the field dependence of magnetization, the hysteresis loops and also coercive fields as observed, the samples exhibit ferromagnetism below ∼ 30 K. Exchange bias effect is also observed in the high V containing sample. The specific heat studies of the samples show transitions consistent with the magnetization data. Pr(Co{sub 0.65}V{sub 0.35}){sub 2}Si{sub 2} and Nd(Co{sub 0.65}V{sub 0.35}){sub 2}Si{sub 2} show magnetoresistance (MR) of ∼ 25% and 15%, respectively, at 4 K and 9 tesla.
Authors:
; ;  [1]
  1. CMP Division, Saha Institute of Nuclear Physics, 1/AF, Bidhannagar, Kolkata-700064 (India)
Publication Date:
OSTI Identifier:
22490579
Resource Type:
Journal Article
Resource Relation:
Journal Name: AIP Conference Proceedings; Journal Volume: 1665; Journal Issue: 1; Conference: 59. DAE solid state physics symposium 2014, Tamilnadu (India), 16-20 Dec 2014; 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; ARC FURNACES; COBALT SILICIDES; FERROMAGNETISM; HYSTERESIS; MAGNETIC PROPERTIES; MAGNETIC SUSCEPTIBILITY; MAGNETIZATION; MAGNETORESISTANCE; MELTING; NEODYMIUM COMPOUNDS; PRASEODYMIUM COMPOUNDS; SPECIFIC HEAT; TEMPERATURE DEPENDENCE; VANADIUM; X-RAY DIFFRACTION