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Localized excitation in the hybridization gap in YbAl3

Localized excitation in the hybridization gap in YbAl3
Localized excitation in the hybridization gap in YbAl3
The intermediate valence compound YbAl3 exhibits a broad magnetic excitation in the inelastic neutron scattering spectrum with characteristic energy E150 meV, equal to the Kondo energy (TK~600–700 K). In the low temperature (T<Tcoh~40 K) Fermi liquid state, however, a new peak in the scattering occurs at E233 meV, which lies in the hybridization gap that exists in this compound. We report inelastic neutron scattering results for a single-crystal sample. The scattering at energies near E1 qualitatively has the momentum (Q) dependence expected for interband scattering across the indirect gap. The scattering near E2 has a very different Q dependence: it is a weak function of Q over a large fraction of the Brillouin zone and is smallest near (1/2,1/2,1/2). A possibility is that the peak at E2 arises from a spatially localized excitation in the hybridization gap.
intermediate valence, YbAl3, hybridisation gap, inelastic neutron scattering
0031-9007
117206-[4pp]
Christianson, A.D.
f72ae15b-1a06-426c-bfdb-5f19fee9837b
Fanelli, V.R.
d0550c9b-4e99-4e81-8cce-76d1a90e3f21
Lawrence, J.M.
f4e83af5-6b94-4639-a1c9-43c9cf245631
Goremychkin, E.A.
37f2b8ac-14dc-4957-9864-b490d9853451
Osborn, R.
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Bauer, E.A.
d9a41ef8-90b4-48ab-a9cd-a39da7b9875b
Sarrao, J.L.
7999d563-1ab6-4505-a0f7-14529f387fbb
Thompson, J.D.
5394b038-dc4b-4e2f-86a4-5a35d1f7612e
Frost, C.D.
d8f3a82f-9170-43f0-9335-0eef3e457eed
Zaretsky, J.L.
bd7d3a14-6141-405b-94f6-b4f9d5bfeb6d
Christianson, A.D.
f72ae15b-1a06-426c-bfdb-5f19fee9837b
Fanelli, V.R.
d0550c9b-4e99-4e81-8cce-76d1a90e3f21
Lawrence, J.M.
f4e83af5-6b94-4639-a1c9-43c9cf245631
Goremychkin, E.A.
37f2b8ac-14dc-4957-9864-b490d9853451
Osborn, R.
12b613a4-baca-43c0-835f-9dc31a5e6a90
Bauer, E.A.
d9a41ef8-90b4-48ab-a9cd-a39da7b9875b
Sarrao, J.L.
7999d563-1ab6-4505-a0f7-14529f387fbb
Thompson, J.D.
5394b038-dc4b-4e2f-86a4-5a35d1f7612e
Frost, C.D.
d8f3a82f-9170-43f0-9335-0eef3e457eed
Zaretsky, J.L.
bd7d3a14-6141-405b-94f6-b4f9d5bfeb6d

Christianson, A.D., Fanelli, V.R., Lawrence, J.M., Goremychkin, E.A., Osborn, R., Bauer, E.A., Sarrao, J.L., Thompson, J.D., Frost, C.D. and Zaretsky, J.L. (2006) Localized excitation in the hybridization gap in YbAl3. Physical Review Letters, 96 (11), 117206-[4pp]. (doi:10.1103/PhysRevLett.96.117206).

Record type: Article

Abstract

The intermediate valence compound YbAl3 exhibits a broad magnetic excitation in the inelastic neutron scattering spectrum with characteristic energy E150 meV, equal to the Kondo energy (TK~600–700 K). In the low temperature (T<Tcoh~40 K) Fermi liquid state, however, a new peak in the scattering occurs at E233 meV, which lies in the hybridization gap that exists in this compound. We report inelastic neutron scattering results for a single-crystal sample. The scattering at energies near E1 qualitatively has the momentum (Q) dependence expected for interband scattering across the indirect gap. The scattering near E2 has a very different Q dependence: it is a weak function of Q over a large fraction of the Brillouin zone and is smallest near (1/2,1/2,1/2). A possibility is that the peak at E2 arises from a spatially localized excitation in the hybridization gap.

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Published date: 22 March 2006
Keywords: intermediate valence, YbAl3, hybridisation gap, inelastic neutron scattering
Organisations: Quantum, Light & Matter Group

Identifiers

Local EPrints ID: 35541
URI: http://eprints.soton.ac.uk/id/eprint/35541
ISSN: 0031-9007
PURE UUID: 0e3b9151-5fcb-4f0a-bb9c-25e17edd01ff

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Date deposited: 18 May 2006
Last modified: 19 Jul 2019 18:59

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