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1.
  • Campillo, E., et al. (författare)
  • Observations of the effect of strong Pauli paramagnetism on the vortex lattice in superconducting CeCu2Si2
  • 2021
  • Ingår i: Physical Review B. - 2469-9950. ; 104:18
  • Tidskriftsartikel (refereegranskat)abstract
    • We present the results of a study of the vortex lattice in the heavy fermion superconductor CeCu2Si2, using small-angle neutron scattering (SANS). In this material at temperatures well below Tc∼0.6 K, the value of the upper critical field Bc2∼2.2 T is strongly limited by the Pauli paramagnetism of the heavy fermions. In this temperature region, our SANS data show an increase in the magnetization of the flux line cores with field, followed by a rapid fall near Bc2. This behavior is the effect of Pauli paramagnetism and we present a theory-based model, which can be used to describe this effect in a range of materials. The pairing in CeCu2Si2 appears to arise from the effect of magnetic fluctuations, but the evidence for a d-wave order parameter is rather weak. We find that the vortex lattice structure in CeCu2Si2 is close to regular hexagonal. There are no phase transitions to square or rhombic structures; such transitions are expected for d-wave superconductors and observed in CeCoIn5; however, the temperature dependence of the SANS intensity indicates that both large and small gap values are present, most likely due to multiband s-wave superconductivity, rather than a nodal gap structure.
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2.
  • Hiess, Arno, et al. (författare)
  • Signature of superconductivity in UBe13 as seen by neutron scattering: Superconducting and magnetic energy scales
  • 2014
  • Ingår i: Physical Review B (Condensed Matter and Materials Physics). - 1098-0121. ; 89:23
  • Tidskriftsartikel (refereegranskat)abstract
    • We here present inelastic neutron scattering results on the strongly correlated cubic superconductor UBe13 (T-c = 0.85 K) obtained on a large single crystal by high-resolution cold neutron three-axis spectroscopy. We observed spin dynamics at a unique momentum space position building up below T similar to 50 K and changing significantly on entering the superconducting state. The observed short-range longitudinal character of the correlations can be understood as a result of competing magnetic interactions. The energy dependence in the normal state reflects the energy scales determined from specific heat, whereas the low-temperature data suggest the opening of a superconducting gap. Our findings are consistent with a superconducting order parameter exhibiting s +/- or d-wave symmetry and placing pure UBe13 in the strong coupling regime.
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