This title appears in the Scientific Report :
2012
Please use the identifier:
http://dx.doi.org/10.1088/0953-8984/24/20/205601 in citations.
Interplay of low-energy phonons and magnetiv excitations in the Kondo insulator YbB12
Interplay of low-energy phonons and magnetiv excitations in the Kondo insulator YbB12
Peculiarities in the lattice dynamics of the Kondo insulator Y bB(12) have been studied by inelastic neutron scattering. Selected phonon modes were traced above and below the temperature region (T ~ 50 K) where the gap opens in the electron density of states. The intensities of some low-energy modes...
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Personal Name(s): | Alekseev, P.A. |
---|---|
Mignot, J.-M. / Nemkovski, K.S. / Rybina, A.V. / Lazukov, V.N. / Ivanov, A.S. / Iga, F. / Takabatake, T. | |
Contributing Institute: |
Streumethoden; PGI-4 Streumethoden; JCNS-2 JCNS-FRM-II; JCNS-FRM-II |
Published in: | Journal of physics / Condensed matter, 24 (2012) S. 205601 |
Imprint: |
Bristol
IOP Publ.
2012
|
Physical Description: |
205601 |
DOI: |
10.1088/0953-8984/24/20/205601 |
PubMed ID: |
22510752 |
Document Type: |
Journal Article |
Research Program: |
In-house Research with PNI Grundlagen für zukünftige Informationstechnologien |
Series Title: |
Journal of Physics: Condensed Matter
24 |
Subject (ZB): | |
Publikationsportal JuSER |
Peculiarities in the lattice dynamics of the Kondo insulator Y bB(12) have been studied by inelastic neutron scattering. Selected phonon modes were traced above and below the temperature region (T ~ 50 K) where the gap opens in the electron density of states. The intensities of some low-energy modes exhibit an anomalous temperature dependence for q vectors close to the Brillouin zone boundary, suggesting a renormalization of the phonon eigenvectors. This effect is thought to arise from a coupling with magnetic excitations of the same symmetry, which exist at nearby energies. It is argued that this magnetovibrational coupling may in turn play a role in the steep temperature crossover existing in Y bB(12) between the low-temperature (Kondo insulator) and high-temperature (incoherent spin-fluctuation) regimes, which is rapidly suppressed by lighter Zr substitution. |