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Hybridization Gap In The Heavy-fermion Compound Upd2al3 Via Quasiparticle Scattering Spectroscopy

Title: Hybridization Gap In The Heavy-fermion Compound Upd2al3 Via Quasiparticle Scattering Spectroscopy.
Name(s): Jaggi, N. K., author
Mehio, O., author
Dwyer, M., author
Greene, L. H., author
Baumbach, R. E., author
Tobash, P. H., author
Bauer, E. D., author
Thompson, J. D., author
Park, W. K., author
Type of Resource: text
Genre: Journal Article
Journal Article
Date Issued: 2017-04-17
Physical Form: computer
online resource
Extent: 1 online resource
Language(s): English
Abstract/Description: We present results from point-contact spectroscopy of the antiferromagnetic heavy-fermion superconductor UPd2Al3: Conductance spectra are taken from single crystals with two major surface orientations as a function of temperature andmagnetic field and analyzed using a theory of cotunneling into anAnderson 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 +/- 0.3meV 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 similar to 28 K, close to the temperature around which the magnetic susceptibility displays a broad peak, the conductance enhancement vanishes at similar to 18 K, slightly above the antiferromagnetic transition temperature (T-N approximate to 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 5f 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 5f dual-nature picture in the literature but also shed new light on the interplay between the itinerant and localized electrons in UPd2Al3.
Identifier: FSU_libsubv1_wos_000399799500004 (IID), 10.1103/PhysRevB.95.165123 (DOI)
Keywords: systems, phase, 5f electrons, hidden order, magnetic excitations, normal-state, point-contact spectroscopy, superconductor upd2al3, uni2al3, uru2si2
Publication Note: The publisher's version of record is available at
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Host Institution: FSU
Is Part Of: Physical Review B.
Issue: iss. 16, vol. 95

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Jaggi, N. K., Mehio, O., Dwyer, M., Greene, L. H., Baumbach, R. E., Tobash, P. H., … Park, W. K. (2017). Hybridization Gap In The Heavy-fermion Compound Upd2al3 Via Quasiparticle Scattering Spectroscopy. Physical Review B. Retrieved from