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Unconventional superconductivity marked by a non-s-wave pairing symmetry has been a frontier of condensed matter physics research. A crystal possessing an inversion symmetry can feature either an even parity, spin-singlet or odd-parity, spin-triplet pairing symmetry as required the Fermi statistics of electrons and point group symmetry. Near a surface, an interface, or a sample with its size comparable with or smaller than the size of the Cooper pair wave packet, a pairing state mixing both the spin-singlet and spin-triplet pairings material can in principle be realized. However, such a pairing state can only be realized if appropriate effective interactions are present in the system to facilitate pairing in more than one channel. In this talk I will discuss our work on the Ru-Sr2RuO4 eutectic system involving single-crystal microdomains of s-wave superconductor Ru embedded in a bulk crystal of p-wave superconductor Sr2RuO4, which explores the pairing symmetries within the Ru microdomains and the so-call 3-K phase regions in Sr2RuO4 surrounding the Ru which features an enhanced superconducting transition temperature. Our work suggests that the Ru-Sr2RuO4 can be used as a model system for the study of the unconventional superconductivity featuring a mixed pairing state.
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Event Venue & Nearby Stays
L2, Science Centre, The Chinese University of Hong Kong, 90 Nathan Rd, Tsim Sha Tsui, Kowloon, Hong Kong SAR,Hong Kong