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Anisotropic properties of single crystals of SrPt$_{3}$P were studied usingLondon penetration depth and electrical resistivity measurements. The uppercritical field, $H_{c2}(T)$, was determined from four-probe electricalresistivity measurements for three orthogonal directions of a magnetic fieldwith respect to the crystal. The London penetration depth, $\lambda(T)$, wasdetermined from the magnetic susceptibility of the Meissner-London statemeasured using a tunnel-diode resonator technique. Whereas $H_{c2}(T)$ and thenormal-state $\rho(T)$ are practically identical for all three magnetic fieldorientations, the London penetration depth shows significant unidirectionalanisotropy. The low-temperature $\lambda(T)$ is exponentially attenuated when asmall excitation radiofrequency magnetic field, $H_{rf}$, is applied along the$c"-$direction, in which case screening currents flow in the $a"b"-$ plane,while for the other two orientations, $H_{rf}\parallel a"$ and $H_{rf}\parallelb"$, the London penetration depth shows a much weaker, $\lambda(T)\sim T^{2}$,variation. Such unusual and contrasting behavior of the two anisotropies,$\gamma_{H}\left(T\right)=H_{c2,ab}/H_{c2,c}=\xi_{ab}/\xi_{c}$ and$\gamma_{\lambda}\left(T\right)=\lambda_{c}/\lambda_{ab}$, imposes significantconstraints on the possible order parameter. Although our measurements areinsufficient to derive conclusively the superconducting gap anisotropy,qualitatively, order parameter with two point nodes and a modulation in theperpendicular direction is consistent with the experimental observations.

Possible unconventional order parameter in single crystals of SrPt$_3$P superconductor