Correlation between magnetoresistivity and magnetic entropy change in the 3D-Heisenberg ferromagnet CuCr 2 Te 4

T. S. Tripathi, R. Mahendiran*, A. K. Rastogi

*Corresponding author for this work

Research output: Contribution to journalArticleScientificpeer-review

5 Citations (Scopus)

Abstract

We report a correlation between magnetoresistivity [Δρ mag = ρ mag (H,T) - ρ mag (0,T)] and magnetic entropy change [ΔS M = S M (H,T) - S M (0,T)] in the metallic spinel CuCr 2 Te 4 which orders ferromagnetically below T C = 320 K. We find that Δρ mag = KΔS M for several temperatures around T C with a temperature independent K, which suggests that magnetoresistivity arising from the suppression of spin disorder scattering scales with ΔS M . However, unlike expected theoretically, a clear correlation is not obtained between Δρ mag and square of the reduced magnetization (M/M sat ) 2 , where M sat is saturation magnetization at 0 K. A maximum magnetoresistance of -3.56% for μ 0 ΔH = 5 T and magnetic entropy change of -1.57 J/kg K occur at T C , which are typical values for itinerant ferromagnets. Critical exponent analysis using modified Arrott plots yield β = 0.371 ± 0.005 and γ = 1.312 ± 0.02 that are close to the 3D-Heisenberg (β = 0.365, γ = 1.336, and δ = 4.66) model.

Original languageEnglish
Article number233907
Number of pages5
JournalJournal of Applied Physics
Volume113
Issue number23
DOIs
Publication statusPublished - 21 Jun 2013
MoE publication typeA1 Journal article-refereed

Keywords

  • THIN-FILMS
  • TRANSPORT
  • SPINELS
  • TRANSITION
  • DEPENDENCE
  • EQUATION
  • NICKEL
  • MODEL
  • STATE
  • TE

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