Symmetry of the order parameter in the high-Tc superconductor YBa2Cu3O7- δ

@article{Kirtley1995SymmetryOT,
  title={Symmetry of the order parameter in the high-Tc superconductor YBa2Cu3O7- $\delta$},
  author={John R. Kirtley and Chang C. Tsuei and J. Z. Sun and Cheng Chung Chi and Lock See Yu-Jahnes and Anurag Gupta and Matthias Rupp and Mark B. Ketchen},
  journal={Nature},
  year={1995},
  volume={373},
  pages={225-228}
}
RECENT discussions of the mechanism of high-temperature superconductivity have focused on the symmetry of the superconducting order parameter (the wavefunction of the superconducting state) as a means of constraining the nature of the interaction that forms the Cooper pairs1,2. There have been many attempts to measure the symmetry of this parameter in the high-temperature superconductor YBa2Cu3O7 - δ (refs 3–10), but they have not yielded consistent results. Here we show that half-integer flux… Expand
Pure dx2 – y2 order-parameter symmetry in the tetragonal superconductor TI2Ba2CuO6+δ
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References

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In High‐TC Superconductors, is D‐Wave the New Wave?
Theorists trying to explain the mechanism for superconductivity in the copper oxide materials may not agree on much, but they all do believe it involves the coupling of electrons of opposite spin.Expand
Symmetry of the superconducting order parameter in a YBa2Cu3O7- delta epitaxial films.
  • Chaudhari, Lin
  • Physics, Materials Science
  • Physical review letters
  • 1994
TLDR
An experimental realization shows no interference effects in a superconducting YBa[sub 2]Cu[sub 3]O[sub 7[minus][delta]] film, consistent with [ital s]-wave symmetry. Expand
Evidence for an unconventional superconducting order parameter in YBa2Cu3O6.9.
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  • Physics, Medicine
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TLDR
Measurements of the dynamic resistance of a dc SQUID formed by two contacts between two different edges of a single crystal of YBa[sub 2]Cu[sub 3]O[sub 6.9] and a Nb block find a phase difference of 160[plus minus]30 between the oscillations of the composite SQUID and those of the SQUID's formed by Nb-Nb junctions. Expand
Precision measurements of the temperature dependence of lambda in YBa2Cu3O6.95: Strong evidence for nodes in the gap function.
TLDR
The strong linear dependence is believed to be characteristic of the pure system and that its apparent absence in thin films and some crystals is due to the presence of defects. Expand
Analysis of NMR data in the superconducting state of YBa2Cu3O7.
TLDR
A weak-coupling theory of antiferromagnetic fluctuations to the superconducting state is extended and an s-wave gap structure with 2Δ(0)/kT c =4 can fit the Knight-shift data for Cu(2) and O(2,3), but it does not provide a satisfactory fit the T 1 -1 data. Expand
Paramagnetic Effect in High T c Superconductors -A Hint for d-Wave Superconductivity
The paramagnetic effect found experimentally in some granular high temperature superconductors is explained by a model of a Josephson network of d -wave superconductors. The unusual microwaveExpand
Orientation dependence of grain-boundary critical currents in YBa2Cu3O7- delta bicrystals.
TLDR
The results imply that achieving a high degree of texture both normal to and within the basal plane is important for obtaining very high critical currents in pure polycrystalline samples. Expand
Imaging of magnetic vortices in superconducting networks and clusters by scanning SQUID microscopy
We have imaged the configuration of trapped magnetic vortices in two‐dimensional superconductor arrays and clusters using a scanning SQUID microscope (SSM). The SSM scans a dc SQUID detector over theExpand
Stability of d-wave pairing in two dimensions
A nearest neighbours pairing interaction favours a state of d(x)2(-y)2 symmetry in cuprate superconductors. Within weak coupling pairing theory this d(x)2(-y)2 state is remarkably stable with respectExpand
Experimental determination of the superconducting pairing state in YBCO from the phase coherence of YBCO-Pb dc SQUIDs.
TLDR
A Comment on the Letter by D. A. Wollman is posted on the website of the American Academy of Arts and Sciences. Expand
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