Muon spin relaxation studies of heavy fermion superconductors Page: 6 of 9
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There is a rapid rise below TN due to the AFM order and a further rise below Tc
due to the flux lattice formed in the superconducting state. This indicates a coexistence
of superconducting and magnetic f-electroi. states The data below Tc was further
analyzed as a product of a Gaussian times an exponential function. The exponential
relaxation rate accounts for the AFM ordering and was held constant for T < Tc. The
Gaussian rate roughly describes the in homogeneous broadening from the flux lattice and
for an ordered triangular lattice is proportional to 1/X2. The temperature dependence of 1/
%2 ic compared to several models of superconductivity in Fig 2. The X(0) = 6250 + 1250
A.F--
0
N<1.0
0.8
0.6
0.4
0.2
00
0.2
0.4
0.6
0.8
1.0
T / Tc
Fig. 2. The temperature dependence of the inverse-square magnetic field penetration
depth in UPd2AI3 compared to various models for the superconducting state Fi oin Ref
6.
The data are consistent with a clean, weak-coupling BCS superconductor, i e. , no
nodes in the gap. This in turn is consistent with the upper critical field data, which show
no anisotropy and Pauli limiting at low temperatures, characteristic of spin-singlet pairing
On the other hand the 1/1' data do not show the exponential temperature dependence
expected for a node-less gap. Furthermore, the ptSR-determined I/02 data are equally
well fit to a power-law temperature dependence (1/X2 (z 1-'T', v - 2 1 0 2), consistent
with a nodal structure in the gap (At this wi iting, no single-crystal p SR data below TV
are available, and so the nodal structute ftom X(T) cannot he specified ) It is possible fhat4
strong dirty
-Q - ---.....two -fluid-
7 strong clean
weak dirty --
weak clean -- \
-
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Heffner, R. H. Muon spin relaxation studies of heavy fermion superconductors, article, June 1, 1993; New Mexico. (https://digital.library.unt.edu/ark:/67531/metadc1384878/m1/6/: accessed July 16, 2024), University of North Texas Libraries, UNT Digital Library, https://digital.library.unt.edu; crediting UNT Libraries Government Documents Department.