The Interplay of Electronic and Nuclear Magnetism in PtFe
x
at Milli-, Micro-, and Nanokelvin Temperatures |
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Authors: | W Wendler T Herrmannsdörfer S Rehmann F Pobell |
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Affiliation: | (1) Universität Bayreuth, D-95440 Bayreuth, Germany;(2) Forschungszentrum Rossendorf, D-01314 Dresden, Germany |
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Abstract: | We have measured ac susceptibility, nuclear magnetic resonance, and nuclear heat capacity of two PtFe
x
samples with concentrations of magnetic impurities x = 11 ppm and 41 ppm at magnetic fields (0 ± 0.05) mTB248 mT. The susceptibility data have been measured at temperatures of 0.3 KT100 mK, no hint for nuclear magnetic ordering could be detected to a temperature of 0.3 K. The nuclear heat capacity data taken at 1.4 KT10 mK show enhanced values which scale with x at low polarization. This effect is described by a model assuming an internal magnetic field caused by the impurities. No indication for nuclear magnetic ordering could be detected to 1.4 K. The nuclear magnetic resonance experiments have been performed on these samples at 0.8 KT0.5 mK and 2.5 mTB22.8 mT as well as on three other samples with x = 5, 10, 31 ppm in a different setup at 40 KT0.5 mK and at 5.4 mTB200 mT. Spin-lattice and effective spin-spin relaxation times
1and
2
*
of 195
Pt strongly depend on x and on the external magnetic field. No temperature dependence of
1and
2
*
could be detected and the NMR data, too, give no hint for nuclear magnetic ordering to 0.8 K. |
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Keywords: | |
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