Journal of Low Temperature Physics

, Volume 17, Issue 3–4, pp 203–221 | Cite as

Electrical properties of exchange-enhanced systems: Fe in (Pd95Rh5)

  • M. E. Colp
  • R. M. Roshko
  • Gwyn Williams
Article

Abstract

The electrical resistivity of the giant moment system Pd95Rh5 containing between 0.8 and 1.85 at % Fe has been measured from 1.4 to 300 K. The incremental resistivity in alloys containing more than 1.25 at % Fe is found to exhibit aT2 limiting low-temperature form; however for the 0.8 and 1.1 at % Fe alloys such aT2 form is not clearly discernible, with Δρ(T) exhibiting a temperature dependence intermediate betweenT2 andT3/2. The former result is predicted from conduction electron-magnon scattering for which wave vector conservation holds, from which it is inferred that the criterion for wave vector conservation in this type of alloy isnot determined by mean free path effects. Estimates of the acoustic spin-wave stiffnessD are derived from the measuredT2 coefficients. These resistivity data also enable estimates of the exchange coupling parameterJs-local to be made. The magnetic ordering temperatureT c is considerably less discernible than in single-component hosts but approximate values have been derived for the various alloys, from which estimates of the exchange coupling parameterJd-local have been made. In the disordered phase the measured incremental resistivity is found to contain a term which decreases approximately linearly with increasing temperature, at a rate of −(1.1±0.45)10−3 µΩ cm/K at % Fe. Using existing pressure data on both Pd- and PdRh-based alloys, it is shown that both the sign and magnitude of this term can be accounted for in terms of the volume dependence of the potential and exchange terms, in conjunction with a large coefficient of thermal expansion.

Keywords

Thermal Expansion Electrical Resistivity Free Path Pressure Data Resistivity Data 

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Copyright information

© Plenum Publishing Corporation 1974

Authors and Affiliations

  • M. E. Colp
    • 1
  • R. M. Roshko
    • 1
  • Gwyn Williams
    • 1
  1. 1.Department of PhysicsUniversity of ManitobaWinnipegCanada

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