Magnetism In 3d Transition Metals at High Pressures

Iota, V

Lawrence Livermore National Laboratory

关键词: Advanced Photon Source;    Magnetic Properties;    X-Ray Spectroscopy;    75 Condensed Matter Physics, Superconductivity And Superfluidity;    Oxides;   

DOI  :  10.2172/877770
RP-ID  :  UCRL-TR-218854
RP-ID  :  W-7405-ENG-48
RP-ID  :  877770

美国|英语

来源: UNT Digital Library

【 摘 要 】

This research project examined the changes in electronic and magnetic properties of transition metals and oxides under applied pressures, focusing on complex relationship between magnetism and phase stability in these correlated electron systems. As part of this LDRD project, we developed new measurement techniques and adapted synchrotron-based electronic and magnetic measurements for use in the diamond anvil cell. We have performed state-of-the-art X-ray spectroscopy experiments at the dedicated high-pressure beamline HP-CAT (Sector 16 Advanced Photon Source, Argonne National Laboratory), maintained in collaboration with of University of Nevada, Las Vegas and Geophysical Laboratory of The Carnegie Institution of Washington. Using these advanced measurements, we determined the evolution of the magnetic order in the ferromagnetic 3d transition metals (Fe, Co and Ni) under pressure, and found that at high densities, 3d band broadening results in diminished long range magnetic coupling. Our experiments have allowed us to paint a unified picture of the effects of pressure on the evolution of magnetic spin in 3d electron systems. The technical and scientific advances made during this LDRD project have been reported at a number of scientific meetings and conferences, and have been submitted for publication in technical journals. Both the technical advances and the physical understanding of correlated systems derived from this LDRD are being applied to research on the 4f and 5f electron systems under pressure.