Critical behaviour of transport coefficients at a structural-ferromagnetic transition. I. Electrical resistivity of TbZn

J. B. Sousa, M. M. Amado, R. P. Pinto, J. M. Moreira, M. E. Braga, M. Ausloos, J. P. Leburton, J. C. Van Hay, P. Clippe, J. P. Vigneron, P. Morin

Research output: Contribution to journalArticlepeer-review

Abstract

The electrical resistivity rho and its temperature derivative d rho /dT of two TbZn monocrystals have been studied over a large temperature range encompassing the Curie temperature (Tc approximately 199.56K) and the spin reorientation temperature (Tr approximately 61.9K). Particular emphasis is put on the critical behaviour analysis. A detailed study shows that a scaling law behaviour characterised by a finite but fairly small critical exponent cannot be experimentally distinguished from a logarithmic dependence above Tc. The cross-over temperature to the mean field behaviour is also pointed out. Outside the critical region, the anomalously large d rho /dT values observed over most of the ferromagnetic range are explained using a mean field model. Finally, the critical behaviour of d rho /dT near Tr is analysed, and the resemblance to the anomaly observed in the specific heat is pointed out.

Original languageEnglish (US)
Article number022
Pages (from-to)933-945
Number of pages13
JournalJournal of Physics F: Metal Physics
Volume10
Issue number5
DOIs
StatePublished - 1980
Externally publishedYes

ASJC Scopus subject areas

  • Engineering(all)
  • Physics and Astronomy (miscellaneous)
  • Metals and Alloys

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