Examination of the hybridization gap in CeTX heavy-fermion compounds
ORAL
Abstract
The f-electrons of cerium hybridize with conduction electrons to produce coherent heavy bands at low
temperatures, which dictates the ground state properties of the system. The CeTX series of compounds
(T = transition metal, X = p-block element) in the ZrNiAl structure type have a variety of interesting ground
states. The Ce atoms sit on a distorted kagome lattice. CePdAl illustrates frustrated magnetism, and is a
candidate quantum spin liquid. CeIrSn and CeRhSn are mixed valent metals with large Kondo
temperatures, yet are in close proximity to a quantum critical point with strong Ising anisotropy at low
temperatures. A direct and quantitative probe of the hybridization gap generated by the c-f
hybridization is provided by infrared absorption experiments. Here we present our results from
temperature dependent Fourier-transformed infrared reflection spectroscopic measurements on a series of CeTX
compounds to study the evolution of the conduction band renormalization as a function of the strength
of the c-f hybridization.
temperatures, which dictates the ground state properties of the system. The CeTX series of compounds
(T = transition metal, X = p-block element) in the ZrNiAl structure type have a variety of interesting ground
states. The Ce atoms sit on a distorted kagome lattice. CePdAl illustrates frustrated magnetism, and is a
candidate quantum spin liquid. CeIrSn and CeRhSn are mixed valent metals with large Kondo
temperatures, yet are in close proximity to a quantum critical point with strong Ising anisotropy at low
temperatures. A direct and quantitative probe of the hybridization gap generated by the c-f
hybridization is provided by infrared absorption experiments. Here we present our results from
temperature dependent Fourier-transformed infrared reflection spectroscopic measurements on a series of CeTX
compounds to study the evolution of the conduction band renormalization as a function of the strength
of the c-f hybridization.
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Presenters
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Thomas U Boehm
Los Alamos National Laboratory
Authors
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Thomas U Boehm
Los Alamos National Laboratory
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Rohit P Prasankumar
a. Center for Integrated Nanotechnologies, Los Alamos National Laboratory, Los Alamos, New Mexico 87545, Los Alamos Natl Lab
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Yu Liu
Los Alamos Natl Lab, Los Alamos National Laboratory
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Eric D Bauer
Los Alamos Natl Lab, Los Alamos National Laboratory, Los Alamos, New Mexico 87545, U.S.A., Los Alamos National Laboratory, Los Alamos, New Mexico, 87545, USA
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Filip Ronning
Los Alamos Natl Lab, Los Alamos National Laboratory, Los Alamos National Laboratory, Los Alamos, New Mexico 87545, U.S.A., Los Alamos National Laboratory, Los Alamos, New Mexico, 87545, USA