Superconductivity mediated by spin fluctuations in the heavy-fermion compound UPd2Al3
Article Abstract:
Tunnelling spectroscopy has been used to analyze the superconducting order parameter of epitaxial thin films of UPd2Al3, a uranium-based heavy-fermion superconductor. It was established that there is a strong-coupling feature in the tunnelling conductivity. However, this in itself does not prove that the pairing mechanism is solely the result of spin fluctuations. Further research must be undertaken, particularly into the spin-fluctuation and phonon spectrum of UPd2Al3. The absence of phononic structures strongly indicates that the dominant mechanism is spin-fluctuation pairing.
Publication Name: Nature
Subject: Zoology and wildlife conservation
ISSN: 0028-0836
Year: 1999
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Vanishing of phase coherence in underdoped Bi2Sr2CaCu2O8+delta
Article Abstract:
Recent research has produced measurements of high-frequency conductivity that track the phase-correlation time tau in the normal state of the Bi2Sr2CaCu2O8+delta family of underdoped copper oxide superconductors. The technique of time-domain transmission spectroscopy was used to capture the linear response at high frequency, from 100 GHz to 600 GHz. It was possible to confirm thermal generation of vortices in the normal state. Vortex proliferation cuts tau to a value that cannot be distinguished from the lifetime of normal-state electrons at 100 K.
Publication Name: Nature
Subject: Zoology and wildlife conservation
ISSN: 0028-0836
Year: 1999
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Superconductivity at 25.5 K in electron-doped layered hafnium nitride
Article Abstract:
It has been possible to identify the properties of the isostructural compound beta-HfNCl. Following electron-doping of the crystal by lithium intercalation, superconductivity with a Tc of up to 25.5 K was observed. It is believed that this is the first layered nitride superconductor, although layered nickel boride containing nitrogen has been reported to be superconducting at 13 K. It was possible to control the amount of lithium uptake by beta-HfNCl by altering the amount of Naph.-Li used.
Publication Name: Nature
Subject: Zoology and wildlife conservation
ISSN: 0028-0836
Year: 1998
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