Electronic and nuclear magnetism in PtFex at milli-, and nanokelvin temperatures
Physikalisches Institut, Universität Bayreuth - D-95440 Bayreuth, Germany
2 Forschungszentrum Rossendorf - D-01314 Dresden, Germany
Accepted: 6 May 1997
Nuclear magnetic resonance, ac susceptibility, and nuclear heat capacity of Pt samples with different concentrations of magnetic impurities x in the ppm range have been studied at magnetic fields and at temperatures . Spin-lattice and spin-spin relaxation times of strongly depend on the impurity content x, and the nuclear heat capacity data show enhanced values which scale with x at low polarization of the nuclear spin system. We present a model to describe the heat capacity data with a spatially varying internal field caused by the magnetic impurities. There is no indication for a nuclear magnetic ordering of to a nuclear temperature of and an electronic temperature of .
PACS: 75.30.Hx – Magnetic impurity interactions / 76.60.-k – Nuclear magnetic resonance and relaxation / 75.50.Lk – Spin glasses and other random magnets
© EDP Sciences, 1997