$^{195}$Pt NMR measurements in the superconducting state of the nearly heavy Fermion metal U$_2$PtC$_2$
ORAL
Abstract
AC susceptibility and $^{195}$Pt nuclear magnetic resonance measurements of the nearly heavy Fermion metal U$_2$PtC$_2$, with $T_c(H_0=0) = 1.6$ K and $\gamma = 15$ mJ/mol$\cdot$ K$^2$,[1] were taken at temperature down to 10 mK and in magnetic fields up to 12 T. From AC susceptibility, an anisotropic $H_{c2}(T\approx 0)$ of 8 and 10 T has been measured with the external magnetic field $H_0\parallel c$ and $H_0\perp c$, respectively. Below $T_c$, the spectral shift is independent of temperature consistent with spin triplet electron pairing or large spin orbit coupling. Spin-lattice relaxation measurement at temperatures $T_{c} < T < 20$ K follow a modified Korringa relation which indicate ferromagnetic fluctuations, while below $T_c$, $1/T_1\propto T^2$ signifying unconventional superconductivity. [1] G. P. Meisner et al., PRL 53, 1829 (1984).
*Work at Los Alamos was performed under the auspices of the U.S. DOE, Office of Basic Energy Science, Division of Materials and Engineering.
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