Raman Scattering from Spin Fluctuations and Phonons in UPt<Subscript>3</Subscript>: Fid-Bau Portal

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Raman Scattering from Spin Fluctuations and Phonons in UPt3

Brenten, E. / Zirngiebl, E. / Wire, M. S. / Blumenröder, S. / Pofahl, G. / Güntherodt, G. / Fisk, Z.

Abstract Since the discovery of its strongly enhanced magnetic susceptibility1, the compound UPt3 has become of increasingly greater interest. The finding of bulk superconductivity2,3 in UPt3 together with a T3. In T term in the low temperature specif lcheat, attributed to spin fluctuations, led to speculations3,4 about non-BCS or triplet pairing in this5heavy fermion superconductor. Neutron measurements of UPt 3 5 have confirmed the xistence of spin fluctuations for momentum transfers q ≥ 1Å−1 by detecting a broad line in the magnetic scattering cross section. The spin fluctuation temperature TSF or the spin relaxation rate of UPt3, given by the half widtn at half maximum (HWHM), Γ/2, of this quasielastic line, is found to be≈ 100 K. Below a characteristic temperature T*≃ 18 K, given by the maximum of the magnetic susceptibility, the coherence of UPt3 is described in terms of Fermi liquid theory, yielding for the spin fluctuations Γ/2∼vF·q, where vF is the Fermi velocity. The important question was whether q≈0 Raman measurements could prove this linear q dependence.

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Raman Scattering from Spin Fluctuations and Phonons in UPt3

Brenten, E. / Zirngiebl, E. / Wire, M. S. / Blumenröder, S. / Pofahl, G. / Güntherodt, G. / Fisk, Z.

Abstract Since the discovery of its strongly enhanced magnetic susceptibility1, the compound UPt3 has become of increasingly greater interest. The finding of bulk superconductivity2,3 in UPt3 together with a T3. In T term in the low temperature specif lcheat, attributed to spin fluctuations, led to speculations3,4 about non-BCS or triplet pairing in this5heavy fermion superconductor. Neutron measurements of UPt 3 5 have confirmed the xistence of spin fluctuations for momentum transfers q ≥ 1Å−1 by detecting a broad line in the magnetic scattering cross section. The spin fluctuation temperature TSF or the spin relaxation rate of UPt3, given by the half widtn at half maximum (HWHM), Γ/2, of this quasielastic line, is found to be≈ 100 K. Below a characteristic temperature T*≃ 18 K, given by the maximum of the magnetic susceptibility, the coherence of UPt3 is described in terms of Fermi liquid theory, yielding for the spin fluctuations Γ/2∼vF·q, where vF is the Fermi velocity. The important question was whether q≈0 Raman measurements could prove this linear q dependence.

Raman Scattering from Spin Fluctuations and Phonons in UPt3

Brenten, E. / Zirngiebl, E. / Wire, M. S. / Blumenröder, S. / Pofahl, G. / Güntherodt, G. / Fisk, Z.

Abstract Since the discovery of its strongly enhanced magnetic susceptibility1, the compound UPt3 has become of increasingly greater interest. The finding of bulk superconductivity2,3 in UPt3 together with a T3. In T term in the low temperature specif lcheat, attributed to spin fluctuations, led to speculations3,4 about non-BCS or triplet pairing in this5heavy fermion superconductor. Neutron measurements of UPt 3 5 have confirmed the xistence of spin fluctuations for momentum transfers q ≥ 1Å−1 by detecting a broad line in the magnetic scattering cross section. The spin fluctuation temperature TSF or the spin relaxation rate of UPt3, given by the half widtn at half maximum (HWHM), Γ/2, of this quasielastic line, is found to be≈ 100 K. Below a characteristic temperature T*≃ 18 K, given by the maximum of the magnetic susceptibility, the coherence of UPt3 is described in terms of Fermi liquid theory, yielding for the spin fluctuations Γ/2∼vF·q, where vF is the Fermi velocity. The important question was whether q≈0 Raman measurements could prove this linear q dependence.

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Titel:

Raman Scattering from Spin Fluctuations and Phonons in UPt3

Beteiligte:

Brenten, E. (Autor:in) / Zirngiebl, E. (Autor:in) / Wire, M. S. (Autor:in) / Blumenröder, S. (Autor:in) / Pofahl, G. (Autor:in) / Güntherodt, G. (Autor:in) / Fisk, Z. (Autor:in)

Erschienen in:

Theoretical and Experimental Aspects of Valence Fluctuations and Heavy Fermions ; 353-356

Erscheinungsdatum:

01.01.1987

Format / Umfang:

4 pages

ISBN:

978-1-4612-8259-4 , 978-1-4613-0947-5

DOI:

https://doi.org/10.1007/978-1-4613-0947-5_42

Medientyp:

Aufsatz/Kapitel (Buch)

Format:

Elektronische Ressource

Sprache:

Englisch

Schlagwörter:

Raman Scattering , Heavy Fermion , Spin Fluctuation , Coherence Effect , Spin Relaxation Rate Physics , Optics and Electrodynamics , Characterization and Evaluation of Materials

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