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Probing the superconducting gap symmetry of PrOs4Sb12: a penetration depth study

, : Probing the superconducting gap symmetry of PrOs4Sb12: a penetration depth study. Physical Review Letters 91(24): 247003-247003

We report measurements of the magnetic penetration depth lambda in single crystals of PrOs4Sb12 down to 0.1 K, with the ac field applied along the a, b, and c directions. In all three field orientations, lambda approximately T2 and superfluid density rho(s) approximately T2 for T<0.3T(c). Data are best fit by the 3He A-phase-like gap with multidomains, each having two point nodes along a cube axis, and parameter Delta(0)(0)/k(B)T(c)=2.6, suggesting that PrOs4Sb12 is a strong-coupling superconductor with two point nodes on the Fermi surface. We also confirm the double transitions at 1.75 and 1.85 K seen in other measurements.


PMID: 14683149

DOI: 10.1103/PhysRevLett.91.247003

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