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Title: Hybridization gap and dual nature of the heavy-fermion compound UPd2Al3 via quasiparticle scattering spectroscopy

Abstract

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 and magnetic field and analyzed using a theory of cotunneling 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 ± 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 ~28 K, close to the temperature around which the magnetic susceptibility displays a broad peak, the conductance enhancement vanishes at ~18 K, slightly above the antiferromagnetic transition temperature (T N ≈ 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 affectedmore » 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 UPd2Al3 .« less

Authors:
 [1];  [2];  [2];  [2];  [3]; ORCiD logo [3]; ORCiD logo [3]; ORCiD logo [3];  [2]
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  1. Illinois Wesleyan Univ., Bloomington, IL (United States); Univ. of Illinois, Urbana-Champaign, IL (United States). Dept. of Physics and Materials Research Lab.
  2. Univ. of Illinois, Urbana-Champaign, IL (United States). Dept. of Physics and Materials Research Lab.
  3. Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
Publication Date:
Research Org.:
Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
Sponsoring Org.:
USDOE Office of Science (SC). Basic Energy Sciences (BES) (SC-22); USDOE Office of Science (SC), Basic Energy Sciences (BES)
OSTI Identifier:
1369187
Alternate Identifier(s):
OSTI ID: 1351928
Report Number(s):
LA-UR-16-28194
Journal ID: ISSN 2469-9950; TRN: US1702655
Grant/Contract Number:  
AC52-06NA25396
Resource Type:
Accepted Manuscript
Journal Name:
Physical Review B
Additional Journal Information:
Journal Volume: 95; Journal Issue: 16; Journal ID: ISSN 2469-9950
Publisher:
American Physical Society (APS)
Country of Publication:
United States
Language:
English
Subject:
75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY

Citation Formats

Jaggi, N. K., Mehio, O., Dwyer, M., Greene, L. H., Baumbach, Ryan E., Tobash, Paul H., Bauer, Eric Dietzgen, Thompson, Joe David, and Park, W. K. Hybridization gap and dual nature of the heavy-fermion compound UPd2Al3 via quasiparticle scattering spectroscopy. United States: N. p., 2017. Web. doi:10.1103/PhysRevB.95.165123.
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Jaggi, N. K., Mehio, O., Dwyer, M., Greene, L. H., Baumbach, Ryan E., Tobash, Paul H., Bauer, Eric Dietzgen, Thompson, Joe David, & Park, W. K. Hybridization gap and dual nature of the heavy-fermion compound UPd2Al3 via quasiparticle scattering spectroscopy. United States. https://doi.org/10.1103/PhysRevB.95.165123
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Jaggi, N. K., Mehio, O., Dwyer, M., Greene, L. H., Baumbach, Ryan E., Tobash, Paul H., Bauer, Eric Dietzgen, Thompson, Joe David, and Park, W. K. Mon . "Hybridization gap and dual nature of the heavy-fermion compound UPd2Al3 via quasiparticle scattering spectroscopy". United States. https://doi.org/10.1103/PhysRevB.95.165123. https://www.osti.gov/servlets/purl/1369187.
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@article{osti_1369187,
title = {Hybridization gap and dual nature of the heavy-fermion compound UPd2Al3 via quasiparticle scattering spectroscopy},
author = {Jaggi, N. K. and Mehio, O. and Dwyer, M. and Greene, L. H. and Baumbach, Ryan E. and Tobash, Paul H. and Bauer, Eric Dietzgen and Thompson, Joe David and Park, W. K.},
abstractNote = {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 and magnetic field and analyzed using a theory of cotunneling 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 ± 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 ~28 K, close to the temperature around which the magnetic susceptibility displays a broad peak, the conductance enhancement vanishes at ~18 K, slightly above the antiferromagnetic transition temperature (T N ≈ 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 UPd2Al3 .},
doi = {10.1103/PhysRevB.95.165123},
journal = {Physical Review B},
number = 16,
volume = 95,
place = {United States},
year = {Mon Apr 17 00:00:00 EDT 2017},
month = {Mon Apr 17 00:00:00 EDT 2017}
}
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Journal Article:
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Publisher's Version of Record
https://doi.org/10.1103/PhysRevB.95.165123
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Figures / Tables:

Figure 1 Figure 1: (a) DC resistivity in the temperature range of Tc < T < TN of a single crystalline UPd2Al3 used in the QPS measurement. The red solid line is the best fit, as described in the text, to the expression 𝜌(𝑇) = 𝜌0 + 𝐴 𝑇 2 + 𝐶more » Δ5𝑒−$\frac{Δ}{T}$ {$\frac{1}{5}$ ($\frac{T}{Δ}$) 5 + ($\frac{T}{Δ}$) 4 + $\frac{5}{3}$ ($\frac{T}{Δ}$) 3}, with Δ = 1.4 ± 0.1 meV. The upper inset shows 𝜌(T) up to 300 K with T𝜌,max for the resistance maximum being approximately 82 K. The lower inset is a zoomed view of 𝜌(T) below 18 K showing both the antiferromagnetic transition (kink) at TN = 14 K and the superconducting transition (jump) at Tc = 1.9 K. (b) Magnetic susceptibility $\mathcal{χ}$(T) of the same UPd2Al3 crystal, showing that $\mathcal{χ}$(T) peaks at approximately T$\mathcal{χ}$, max = 35 K, well above the antiferromagnetic transition at TN = 14 K. The upper inset shows the temperature dependence of the inverse susceptibility $\mathcal{χ}$-1, with the solid red line representing the best linear fit in the high temperature range. $\mathcal{χ}$-1 starts deviating from this straight line around T$\mathcal{χ}$,nl ≈ 60 K. The lower inset is a schematic of the hexagonal crystal structure of UPd2Al3 including the antiferromagnetic alignment of the local moments below TN.« less
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