Abstract
We report on our systematic study of evolution of magnetic-history dependent Hall resistivity and specific heat of UNiAl with respect to magnetic field and temperature. It is known1) that “virgin” curves expressing the field dependencies of the bulk properties of UNiAl measured from the ZFC state clearly differ from these observed on a sample, which has once appeared in the high-field state. The different shapes of M(B), ρ(B) and ρH(B) curves are strongly suggestive of field induced changes in the spectrum of spin fluctuations in UNiAl. This is corroborated by the effect of "field annealing" on the low temperature gamma-value derived from our present specific-heat measurements. The magnetic-field induced irreversibility of Hall resistivity is the strongest at the lowest temperature of measurements (1.7 K), decay with increasing temperature and vanish around 7 K. We have also observed that exposing UNiAl is not a necessary condition to observe irreversibility in lower fields. Based on the results of our measurements, a magnetic phase diagram is constructed and discussed in the light of results of recent neutron-diffraction measurements.
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