From obscurity to impurity
Article Abstract:
The most recent example of the significance of scanning tunnelling microscopy (STM) is STM imaging and tunnelling spectroscopy of the electronic states found around impurity atoms. This research produced STM images and electron-tunnelling spectra of the impurity states induced by zinc impurity atoms in a copper oxide superconductor. It was found that, when the CuO2 layer is not at the surface, the impurity 'cross' seen by the STM at larger distances from the impurity appears to be more aligned with the gap. This could be because, as the impurity is not on the surface, the measured signal is a mixture of the impurity state and the interlayer tunnelling conductance.
Publication Name: Nature
Subject: Zoology and wildlife conservation
ISSN: 0028-0836
Year: 2000
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Unconventional superconductivity in PuCoGa5
Article Abstract:
Measurements of the nuclear spin-lattice relaxation rate and Knight shift in PuCoGa5 demonstrate that it is an unconventional superconductor with properties as expected for antiferromagnetically mediated super-conductivity. Scaling of the relaxation rates among all of these materials establishes antiferromagnetic fluctuations as a likely mechanism for their unconventional superconductivity and suggests that related classes of exotic superconductors might be discovered.
Publication Name: Nature
Subject: Zoology and wildlife conservation
ISSN: 0028-0836
Year: 2005
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Interplay of electron-lattice interactions and superconductivity in Bi2Sr2CaCu2[O.sub.8Delta]
Article Abstract:
[d.sup.2]I/d[V.sup.2] imaging studies of the high-[T.sub.c] superconductor Bi2Sr2CaCu2[O.sub.8Delta] reveal intense disorder of electron-boson interaction mode energies at the nanometre scale, along with the expected [d.sup.2]I/d[V.sup.2] spectra modulations, where the modes seem to be local lattice vibrations. The mode energies are always spatially anticorrelated with the superconducting pairing-gap energies, suggesting an interplay between lattice vibration modes and the superconductivity.
Publication Name: Nature
Subject: Zoology and wildlife conservation
ISSN: 0028-0836
Year: 2006
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