Microwave Spectroscopy of PrOs₄Sb₁2: Josephson-Coupled Two-Band Superconductivity and Itinerant f Electrons
Broun, D. M. · Turner, P. J. · Mullins, G. K. · Sheehy, D. E. · Zheng, X. G. · Kim, S. K. · Frederick, N. A. · Maple, M. B. · Hardy, W. N. · Bonn, D. A.
Original · EN
We report microwave surface impedance measurements made on a single crystal of PrOs₄Sb₁2 across the frequency range 0.5 to 21 GHz. The penetration depth data provide clear thermodynamic evidence for superconductivity arising in two bands coupled by Josephson pair-tunneling, indicating two order parameters with the same symmetry. Detailed conductivity spectra obtained using high-resolution bolometry confirm this picture and extend it, revealing the itinerant nature of the Pr f electrons through the observation of quasiparticles with heavily renormalized mass.
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