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Title: TRANSPORT IN THE HEAVY FERMION SUPERCONDUCTOR UPT3

Abstract

We report new theoretical results and analysis for the transport properties of superconducting UPt{sub 3}based on the leading models for the pairing symmetry. We use Fermi surface data and the measured inelastic scattering rate to show that the low-temperature thermal conductivity and transverse sound attenuation in the A and B phase of UPt3 are in excellent agreement with pairing states belonging to the two-dimensional orbital E{sub 2u} representation.

Authors:
;
Publication Date:
Research Org.:
Los Alamos National Lab., NM (US)
Sponsoring Org.:
US Department of Energy (US)
OSTI Identifier:
773894
Report Number(s):
LA-UR-99-3419
TRN: US0102835
DOE Contract Number:
W-7405-ENG-36
Resource Type:
Conference
Resource Relation:
Conference: Conference title not supplied, Conference location not supplied, Conference dates not supplied; Other Information: PBD: 1 Apr 1999
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; ATTENUATION; FERMI LEVEL; INELASTIC SCATTERING; SUPERCONDUCTORS; SYMMETRY; THERMAL CONDUCTIVITY; URANIUM ALLOYS; PLATINUM ALLOYS; INTERMETALLIC COMPOUNDS

Citation Formats

M. GRAF, and ET AL. TRANSPORT IN THE HEAVY FERMION SUPERCONDUCTOR UPT3. United States: N. p., 1999. Web.
M. GRAF, & ET AL. TRANSPORT IN THE HEAVY FERMION SUPERCONDUCTOR UPT3. United States.
M. GRAF, and ET AL. Thu . "TRANSPORT IN THE HEAVY FERMION SUPERCONDUCTOR UPT3". United States. doi:. https://www.osti.gov/servlets/purl/773894.
@article{osti_773894,
title = {TRANSPORT IN THE HEAVY FERMION SUPERCONDUCTOR UPT3},
author = {M. GRAF and ET AL},
abstractNote = {We report new theoretical results and analysis for the transport properties of superconducting UPt{sub 3}based on the leading models for the pairing symmetry. We use Fermi surface data and the measured inelastic scattering rate to show that the low-temperature thermal conductivity and transverse sound attenuation in the A and B phase of UPt3 are in excellent agreement with pairing states belonging to the two-dimensional orbital E{sub 2u} representation.},
doi = {},
journal = {},
number = ,
volume = ,
place = {United States},
year = {Thu Apr 01 00:00:00 EST 1999},
month = {Thu Apr 01 00:00:00 EST 1999}
}

Conference:
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  • The authors have determined the effect of hydrostatic pressure on the susceptibility, on the TS temperature dependence of the spin-fluctuation resistivity, and on superconductivity in UPt3. The spin-fluctuation temperature T/sub s/, derived from the slope of resistivity versus TS, is used within a Fermi-liquid picture to calculate the susceptibility chi at T = 0 K. The depression of this calculated chi with pressure agrees with the directly measured value delta 1nchi/delta P = -24 Mbar . Both the superconducting transition temperature T/sub c/ and the initial slope of the upper critical field also decrease under pressure. The authors find thatmore » delta 1nT/sub c//delta P = -25 Mbar and speculate upon correlations between chi and T/sub c/. 17 references, 4 figures.« less
  • We have made low field measurements of the upper critical field as a function of temperature for all parallel and perpendicular configurations of magnetic field H, current I, and crystallographic orientation for UPt/sub 3/, the heavy fermion superconductor. The curves are quite linear for H parallel I, with slopes of -4.0 T/K for I in the basal plane and -6.3 T/K for I along the c-axis. For H perpendicular I the curves are concave upward near H = 0 and have a generally smaller slope than for the same field applied parallel to the current.
  • Positive muon spin relaxation experiments have been conducted on the heavy-fermion superconductor UPt/sub 3/ in both the normal and superconducting states for zero, transverse, and longitudinally applied magnetic fields. Below 6 K in zero applied field, the ..mu../sup +/ relaxation rate is approximately twice that expected from /sup 195/Pt nuclear dipolar relaxation alone. Transverse- and longitudinal-field measurements show that the observed relaxation rate depends on magnetic field and is quasistatic in origin. It is suggested that the onset of very weak (approx.10/sup -3/ ..mu../sub B//U atom) magnetic ordering below approximately 6 K is responsible for the observed increase in themore » relaxation rate. ..mu../sup +/ Knight shift measurements in the normal state of UPt/sub 3/ show a temperature dependent shift K/sub ..mu../ which tracks the bulk susceptibility chi. From the K/sub ..mu../ vs chi plot, a ..mu../sup +/ hyperfine field of approximately 100 Oe/..mu../sub B/ is extracted.« less
  • Small amounts of Sc, Lu, Gd, Np, Ce, Th, La, and Ba have been substituted for uranium in UBe/sub 13/ to observe their effects. The thorium, which was the most complete study, resulted in an extremely unusual nonmonotonic depression of the transition temperature for a nonmagnetic impurity. This comes from an interplay that exists between the lowest temperature resistivity peak and the transition temperature, as the peak is depressed. These results suggest tat heavy Fermion behavior is only a necessary condition for heavy Fermion superconductivity. All of the impurities tested resulted in a transition temperature depression.