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

  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},
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
Crucial to the successful development of a theoretical model for high-temperature superconductivity is knowledge of the symmetry of the order parameter (or wavefunction) that describes the pairing ofExpand
Possible coexistence of s- and d-wave condensates in copper oxide superconductors
SINCE the discovery of superconductivity in the layered copper oxide materials1, a number of microscopic models have been proposed. To know which of these should be considered further, it isExpand
Phase diagram of the pairing symmetry in two-dimensional strong-coupling superconductors
Abstract Two-dimensional Eliashberg equations have been solved by use of a mixed interaction with s- and d-channels. It is discussed what kind of pairing symmetry of the superconducting state can beExpand
Pseudogap and symmetry of superconducting order parameter in cuprates
The phase diagram, nature of the normal state pseudogap, type of the Fermi surface, and behavior of the superconducting gap in various cuprates are discussed in terms of a correlated state withExpand
The temperature and field dependence of the penetration depth was determined from muon spin rotation (μ+SR) measurements on a single crystal of YBa2Cu3O7 having a superconducting transition at Tc ≈Expand
d-symmetry superconductivity due to valence bond correlations
It is shown that d-symmetry superconductivity due to valence bond correlations is possible. Valence bond correlations are compatible with antiferromagnetic spin order. In order to explictly constructExpand
Determination of pairing symmetry using phase-sensitive tunneling in tricrystal cuprates
An unambiguous determination of the pairing symmetry in cuprate superconductors is important in order to understand the origin of high-temperature superconductivity. By making use of the effects ofExpand
Material-specific gap function in the t - J model of high-temperature superconductors
We present theoretical arguments and experimental support for the idea that high- superconductivity can occur with s-wave, d-wave, or mixed-wave pairing in the context of a magnetic mechanism. TheExpand
Pairing Symmetry in Cuprate Superconductors: Phase-Sensitive Tests
The discover of high-temperature superconductivity (HTS) in the cuprates [1] has stimulated a great deal of re-thinking of some of the most basic concepts in condensed matter physics. Despite theExpand
Tunneling spectroscopy and order parameter symmetry of hole- and electron-doped cuprate superconductors
Abstract In tunneling spectroscopy of superconductors the density of states close to the surface or the interface to an insulating tunneling barrier is probed. For d-wave superconductors theExpand


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
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.
  • Brawner, Ott
  • Physics, Medicine
  • Physical review. B, Condensed matter
  • 1994
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.
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.
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.
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.
A Comment on the Letter by D. A. Wollman is posted on the website of the American Academy of Arts and Sciences. Expand