Magnetic properties of the itinerant ferromagnet LaCrGe3 under pressure studied by La-139 NMR
Date
Authors
Major Professor
Advisor
Committee Member
Journal Title
Journal ISSN
Volume Title
Publisher
Authors
Research Projects
Organizational Units
Ames National Laboratory is a government-owned, contractor-operated national laboratory of the U.S. Department of Energy (DOE), operated by and located on the campus of Iowa State University in Ames, Iowa.
For more than 70 years, the Ames National Laboratory has successfully partnered with Iowa State University, and is unique among the 17 DOE laboratories in that it is physically located on the campus of a major research university. Many of the scientists and administrators at the Laboratory also hold faculty positions at the University and the Laboratory has access to both undergraduate and graduate student talent.
Journal Issue
Is Version Of
Versions
Series
Department
Abstract
139La 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. 139La-NMR spectra for all measured pressures in the ferromagnetically ordered state show a large shift due to the internal field induction |Bint|∼4 T at the La site produced by Cr ordered moments. The change in Bint 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 Bint suggest that the ferromagnetic order develops below ∼50 K under higher pressures in a magnetic field of ∼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 TC are revealed to be three-dimensional ferromagnetic throughout the measured p region.