The effect of pressure and chemical substitution on the ordered phases in the URu<sub>2-<i>x</i></sub><i>M<sub>x</sub></i>Si<sub>2</sub> (<i>M</i> = Fe, Os) systems
ORAL
Abstract
We investigated the effect of applied pressure and chemical substitution on the hidden order (HO) and antiferromagnetic (AFM) phases in URu2Si2 and report electrical resistivity measurements of single crystals of URu2−xMxSi2 (M = Fe, Os) under pressure. A transition from the HO phase to the AFM phase in URu2Si2 occurs at a critical pressure of 1.5 GPa. The AFM phase is also induced upon substitution of Fe or Os ions for Ru at ambient pressure. We observed that as x is increased in URu2−xFexSi2, less external pressure is required to induce the AFM phase. This is explained by the reduction in unit cell volume owing to the substitution of smaller Fe ions for Ru, which may be interpreted as a chemical pressure. We also observed that as y is increased in URu2−yOsySi2, less external pressure is required to induce the AFM phase. This is contrary to the expectation that larger pressures would be required to induce the AFM phase in a system biased with a negative chemical pressure owing to the substitution of larger Os ions for Ru. This suggests that effects other than volume change may be responsible for the HO to AFM transition.
*High-pressure research was supported by the NNSA through DOE under DE-NA0002909; synthesis research was supported by the DOE under DEFG02-04-ER46105.
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Presenters
Christian Wolowiec
Department of Physics, University of California, San Diego
Physics, University of California, San Diego
Department of Physics and Center for Advanced Nanoscience, University of California, San Diego
Physics, Univ of California - San Diego
Authors
Christian Wolowiec
Department of Physics, University of California, San Diego
Physics, University of California, San Diego
Department of Physics and Center for Advanced Nanoscience, University of California, San Diego
Physics, Univ of California - San Diego
Sheng Ran
Department of Physics, University of California, San Diego
Univ of California - San Diego
Physics, University of California, San Diego
Department of Physics, Univeristy of Maryland
Department of Physics, University of Maryland
Inho Jeon
University of California, San Diego
Physics, University of California, San Diego
Department of Physics, University of California, San Diego
Materials Science and Engineering, University of California, San Diego
Materials Science and Engineering Program and Center for Advanced Nanoscience, University of California, San Diego
Materials Science and Engineering Program, and Center for Advanced Nanoscience, Univ of California - San Diego
Materials Science and Engineering Program, Univ of California - San Diego
University of California-San Diego
Naveen Pouse
Department of Physics, University of California, San Diego
Department of Physics and Center for Advanced Nanoscience, University of California, San Diego
Department of Physics and Center for Advanced Nanoscience, Univ of California - San Diego
Kevin Huang
National High Magnetic Field Lab, Florida State University
NHMFL
Natl High Magnetic Field Lab
NHMFL at Florida State University
National HIgh Magnetic Field Lab at Florida State University
National High Magnetic Field Lab at Florida State University
State Key Laboratory of Surface Physics, Department of Physics, Fudan University
Noravee Kanchanavatee
Physics, University of California, San Diego
Department of Physics, University of California, San Diego
Department of Physics and Center for Advanced Nanoscience, University of California, San Diego
M Brian Maple
Department of Physics, University of California, San Diego
University of California, San Diego
Physics, University of California, San Diego
Univ of California - San Diego
Department of Physics and Center for Advanced Nanoscience, University of California, San Diego
Department of Physics, Center for Advanced Nanoscience,Materials Science and Engineering Program , Univ of California - San Diego
Department of Physics, University of California San Diego
