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Abstract:
La-139 nuclear magnetic resonance (NMR) measurements under pressure (p = 0-2.64 GPa) have been carried out to investigate the static and dynamic magnetic properties of the itinerant ferromagnet LaCrGe3. La-139-NMR spectra for all measured pressures in the ferromagnetically ordered state show a large shift due to the internal field induction vertical bar B-int vertical bar similar to 4 T at the La site produced by Cr ordered moments. The change in B-int by less than 5% with p up to 2.64 GPa indicates that the Cr 3d moments are robust under pressure. The temperature dependence of NMR shift and B-int suggest that the ferromagnetic order develops below similar to 50 K under higher pressures in a magnetic field of similar to 7.2 T. Based on the analysis of NMR data using the self-consistent-renormalization (SCR) theory, the spin fluctuations in the paramagnetic state well above T-C are revealed to be three-dimensional ferromagnetic throughout the measured p region.
