Hybridization gap in the heavy-fermion compound UPd$_2$Al$_3$ via quasiparticle scattering spectroscopy
| Title: | Hybridization gap in the heavy-fermion compound UPd$_2$Al$_3$ via quasiparticle scattering spectroscopy |
|---|---|
| Authors: | Jaggi, N. K., Mehio, O., Dwyer, M., Greene, L. H., Baumbach, R. E., Tobash, P. H., Bauer, E. D., Thompson, J. D., Park, W. K. |
| Source: | Phys. Rev. B 95, 165123 (2017) |
| Publication Year: | 2016 |
| Collection: | Condensed Matter |
| Subject Terms: | Condensed Matter - Strongly Correlated Electrons |
| More Details: | We present results from point-contact spectroscopy of the antiferromagnetic heavy-fermion superconductor UPd$_2$Al$_3$: conductance spectra are taken from single crystals with two major surface orientations as a function of temperature and magnetic field, and analyzed using a theory of co-tunneling into an Anderson lattice. Spectroscopic signatures are clearly identified including the distinct asymmetric double-peak structure arising from the opening of a hybridization gap when a coherent heavy Fermi liquid is formed. Both the hybridization gap, found to be 7.2 $\pm$ 0.3 meV at 4 K, and the conductance enhancement above a flat background decrease upon increasing temperature. While the hybridization gap is extrapolated to remain finite up to $\sim$28 K, close to the temperature around which the magnetic susceptibility displays a broad peak, the conductance enhancement vanishes at $\sim$18 K, slightly above the antiferromagnetic transition temperature ($T_\textrm{N}$ $\approx$ 14 K). This rapid decrease of the conductance enhancement is understood as a consequence of the junction drifting away from the ballistic regime due to increased scattering off magnons associated with the localized U 5$f$ electrons. This shows that while the hybridization gap opening is not directly associated with the antiferromagnetic ordering, its visibility in the conductance is greatly affected by the temperature-dependent magnetic excitations. Our findings are not only consistent with the 5$f$ dual-nature picture in the literature but also shed new light on the interplay between the itinerant and localized electrons in UPd$_2$Al$_3$. Comment: 28 pages, 8 figures, published in Phys. Rev. B |
| Document Type: | Working Paper |
| DOI: | 10.1103/PhysRevB.95.165123 |
| Access URL: | http://arxiv.org/abs/1610.08601 |
| Accession Number: | edsarx.1610.08601 |
| Database: | arXiv |
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| Items | – Name: Title Label: Title Group: Ti Data: Hybridization gap in the heavy-fermion compound UPd$_2$Al$_3$ via quasiparticle scattering spectroscopy – Name: Author Label: Authors Group: Au Data: <searchLink fieldCode="AR" term="%22Jaggi%2C+N%2E+K%2E%22">Jaggi, N. K.</searchLink><br /><searchLink fieldCode="AR" term="%22Mehio%2C+O%2E%22">Mehio, O.</searchLink><br /><searchLink fieldCode="AR" term="%22Dwyer%2C+M%2E%22">Dwyer, M.</searchLink><br /><searchLink fieldCode="AR" term="%22Greene%2C+L%2E+H%2E%22">Greene, L. H.</searchLink><br /><searchLink fieldCode="AR" term="%22Baumbach%2C+R%2E+E%2E%22">Baumbach, R. E.</searchLink><br /><searchLink fieldCode="AR" term="%22Tobash%2C+P%2E+H%2E%22">Tobash, P. H.</searchLink><br /><searchLink fieldCode="AR" term="%22Bauer%2C+E%2E+D%2E%22">Bauer, E. D.</searchLink><br /><searchLink fieldCode="AR" term="%22Thompson%2C+J%2E+D%2E%22">Thompson, J. D.</searchLink><br /><searchLink fieldCode="AR" term="%22Park%2C+W%2E+K%2E%22">Park, W. K.</searchLink> – Name: TitleSource Label: Source Group: Src Data: Phys. Rev. B 95, 165123 (2017) – Name: DatePubCY Label: Publication Year Group: Date Data: 2016 – Name: Subset Label: Collection Group: HoldingsInfo Data: Condensed Matter – Name: Subject Label: Subject Terms Group: Su Data: <searchLink fieldCode="DE" term="%22Condensed+Matter+-+Strongly+Correlated+Electrons%22">Condensed Matter - Strongly Correlated Electrons</searchLink> – Name: Abstract Label: Description Group: Ab Data: We present results from point-contact spectroscopy of the antiferromagnetic heavy-fermion superconductor UPd$_2$Al$_3$: conductance spectra are taken from single crystals with two major surface orientations as a function of temperature and magnetic field, and analyzed using a theory of co-tunneling into an Anderson lattice. Spectroscopic signatures are clearly identified including the distinct asymmetric double-peak structure arising from the opening of a hybridization gap when a coherent heavy Fermi liquid is formed. Both the hybridization gap, found to be 7.2 $\pm$ 0.3 meV at 4 K, and the conductance enhancement above a flat background decrease upon increasing temperature. While the hybridization gap is extrapolated to remain finite up to $\sim$28 K, close to the temperature around which the magnetic susceptibility displays a broad peak, the conductance enhancement vanishes at $\sim$18 K, slightly above the antiferromagnetic transition temperature ($T_\textrm{N}$ $\approx$ 14 K). This rapid decrease of the conductance enhancement is understood as a consequence of the junction drifting away from the ballistic regime due to increased scattering off magnons associated with the localized U 5$f$ electrons. This shows that while the hybridization gap opening is not directly associated with the antiferromagnetic ordering, its visibility in the conductance is greatly affected by the temperature-dependent magnetic excitations. Our findings are not only consistent with the 5$f$ dual-nature picture in the literature but also shed new light on the interplay between the itinerant and localized electrons in UPd$_2$Al$_3$.<br />Comment: 28 pages, 8 figures, published in Phys. Rev. B – Name: TypeDocument Label: Document Type Group: TypDoc Data: Working Paper – Name: DOI Label: DOI Group: ID Data: 10.1103/PhysRevB.95.165123 – Name: URL Label: Access URL Group: URL Data: <link linkTarget="URL" linkTerm="http://arxiv.org/abs/1610.08601" linkWindow="_blank">http://arxiv.org/abs/1610.08601</link> – Name: AN Label: Accession Number Group: ID Data: edsarx.1610.08601 |
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| RecordInfo | BibRecord: BibEntity: Identifiers: – Type: doi Value: 10.1103/PhysRevB.95.165123 Subjects: – SubjectFull: Condensed Matter - Strongly Correlated Electrons Type: general Titles: – TitleFull: Hybridization gap in the heavy-fermion compound UPd$_2$Al$_3$ via quasiparticle scattering spectroscopy Type: main BibRelationships: HasContributorRelationships: – PersonEntity: Name: NameFull: Jaggi, N. K. – PersonEntity: Name: NameFull: Mehio, O. – PersonEntity: Name: NameFull: Dwyer, M. – PersonEntity: Name: NameFull: Greene, L. H. – PersonEntity: Name: NameFull: Baumbach, R. E. – PersonEntity: Name: NameFull: Tobash, P. H. – PersonEntity: Name: NameFull: Bauer, E. D. – PersonEntity: Name: NameFull: Thompson, J. D. – PersonEntity: Name: NameFull: Park, W. K. IsPartOfRelationships: – BibEntity: Dates: – D: 26 M: 10 Type: published Y: 2016 |
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