4,586 research outputs found
Evolution of superconducting order in Pr(OsRu)Sb
We report measurements of the magnetic penetration depth in single
crystals of Pr(OsRu)Sb down to 0.1 K. Both
and superfluid density exhibit an exponential behavior for the
0.4 samples, going from weak (=0.4,0.6), to moderate, coupling
(=0.8). For the 0.2 samples, both and vary as
at low temperatures, but is s-wave-like at intermediate to
high temperatures. Our data are consistent with a three-phase scenario, where a
fully-gapped phase at undergoes two transitions: first to an
unconventional phase at , then to a nodal low-
phase at , for small values of .Comment: Changed title, enlarged numbering in figures 5 pages, 4 figures, 1
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Superconducting phase diagram of the filled skuterrudite PrOs4Sb12
We present new measurements of the specific heat of the heavy fermion
superconductor PrOs4Sb12, on a sample which exhibits two sharp distinct
anomalies at Tc1= 1.89K and Tc2= 1.72K. They are used to draw a precise
magnetic field-temperature superconducting phase diagram of PrOs4Sb12 down to
350 mK.
We discuss the superconducting phase diagram of PrOs4Sb12 and its possible
relation with an unconventional superconducting order parameter. We give a
detailed analysis of Hc2(T), which shows paramagnetic limitation (a support for
even parity pairing) and multiband effects
Transport properties of the heavy fermion superconductor PrOsSb
We have measured the electrical resistivity, thermoelectric power, Hall
coefficient, and magnetoresistance (MR) on single crystals of
PrOsSb, LaOsSb and NdOsSb. All the
transport properties in PrOsSb are similar to those in
LaOsSb and NdOsSb at high temperatures, indicating
the localized character of 4-electrons. The transverse MR both in
LaOsSb and PrOsSb tends to saturate for wide field
directions, indicating these compounds to be uncompensated metals with no open
orbit. We have determined the phase diagram of the field induced ordered phase
by the MR measurement for all the principle field directions, which indicates
an unambiguous evidence for the singlet crystalline electric
field ground state.Comment: 7 pages, 10 figures, to appear in Physical Review
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