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    The Resonance Peak in Sr2_2RuO4_4: Signature of Spin Triplet Pairing

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    We study the dynamical spin susceptibility, χ(q,ω)\chi({\bf q}, \omega), in the normal and superconducting state of Sr2_2RuO4_4. In the normal state, we find a peak in the vicinity of Qi≃(0.72π,0.72π){\bf Q}_i\simeq (0.72\pi,0.72\pi) in agreement with recent inelastic neutron scattering (INS) experiments. We predict that for spin triplet pairing in the superconducting state a {\it resonance peak} appears in the out-of-plane component of χ\chi, but is absent in the in-plane component. In contrast, no resonance peak is expected for spin singlet pairing.Comment: 4 pages, 4 figures, final versio

    Investigation of the kinetics of crystallization of molten binary and ternary oxide systems Quarterly status report, 1 Dec. 1967 - 29 Feb. 1968

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    Reaction kinetics of crystallized molten binary and ternary oxide glass making composition

    Point-contact spectroscopy in heavy-fermion superconductors

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    We develop a minimal model to calculate point-contact spectra between a metallic tip and a superconducting heavy-fermion system. We apply our tunneling model to the heavy fermion CeCoIn5, both in the normal and superconducting state. In point-contact and scanning tunneling spectroscopy many heavy-fermion materials, like CeCoIn5, exhibit an asymmetric differential conductance, dI/dV, combined with a strongly suppressed Andreev reflection signal in the superconducting state. We argue that both features may be explained in terms of a multichannel tunneling model in the presence of localized states near the interface. We find that it is not sufficient to tunnel into two itinerant bands of light and heavy electrons to explain the Fano line shape of the differential conductance. Localized states in the bulk or near the interface are an essential component for quantum interference to occur when an electron tunnels from the metallic tip of the point contact into the heavy-fermion system.Comment: 13 pages, 9 figures. Accepted for publication in Physical Review
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