Thermal expansion of heavy-fermion CeRhIn<sub>5</sub> under pressure
ORAL
Abstract
Antiferromagnetic CeRhIn5 is a prototypical heavy-fermion compound. With applied pressure, the antiferromagnetic ordering of CeRhIn5 disappears and an unconventional superconducting state emerges. Crystalline electric field (CEF) effects are known to be important in the determination of the ground state of heavy-fermion materials. However, CEF effects in CeRhIn5 have not been studied under pressure because of the limiting volume and background of pressure cells. Here we probe the CEF scheme of CeRhIn5 via thermal expansion measurements under pressure using the strain gauge method at high temperature and optical fiber sensors at low temperature. We report the temperature dependence of the linear thermal-expansion coefficient of CeRhIn5 under pressure. Our results allow us to determine CEF splitting energies from the ground state to the excited state and observe the evolution of the phase transitions under pressure. We will discuss the pressure dependence of CEF effects in CeRhIn5 in comparison with other 115 compounds.
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Presenters
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Soonbeom Seo
Los Alamos Natl Lab, Los Alamos National Laboratory
Authors
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Soonbeom Seo
Los Alamos Natl Lab, Los Alamos National Laboratory
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Sean Thomas
Los Alamos National Laboratory, Los Alamos Natl Lab
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Filip Ronning
Los Alamos National Laboratory, Los Alamos Natl Lab, Condensed Matter and Magnet Science Group, Los Alamos National Laboratory
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Eric Bauer
Los Alamos National Laboratory, Los Alamos Natl Lab, Condensed Matter and Magnet Science Group, Los Alamos National Laboratory, Los Alamos National Laboratory, Los Alamos
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Joe D Thompson
Los Alamos National Laboratory, Los Alamos Natl Lab
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Priscila Rosa
Los Alamos National Laboratory, Los Alamos Natl Lab, Los Alamos National Laboratory, USA