Experimental evidence for a<i>d</i>-wave pairing state in<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:msub><mml:mrow><mml:mi mathvariant="normal">YBa</mml:mi></mml:mrow><mml:mrow><mml:mn>2</mml:mn></mml:mrow></mml:msub></mml:mrow></mml:math><mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:msub><mml:mrow><mml:mi mathvariant="normal">Cu</mml:mi></mml:mrow><mml:mrow><mml:mn>3</mml:mn></mml:mrow></mml:msub></mml:mrow></mml:math

Iguchi, Ienari; Wen, Zhen

doi:10.1103/physrevb.49.12388

Cited by 74 publications

(33 citation statements)

References 17 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…(17). Similar patterns were reported by different groups [139][140][141]. The pattern shown in [142] or by the size of the junction [143].…”

Section: Fig 17supporting

confidence: 73%

See 1 more Smart Citation

Paramagnetic Meissner effect and related dynamical phenomena

2003

Physics Reports

View full text Add to dashboard Cite

The hallmark of superconductivity is the diamagnetic response to external magnetic field. In striking contrast to this behavior, a paramagnetic response or paramagnetic Meissner effect was observed in ceramic high-Tc and in conventional superconductors. The present review is given on this interesting effect and related phenomena. We begin with a detailed discussion of experimental results on the paramagnetic Meissner effect in both granular and conventional superconductors. There are two main mechanisms leading to the paramagnetic response: the so called d-wave and the flux compression. In the first scenario, the Josephson critical current between two d-wave superconductors becomes negative or equivalently one has a π junction. The paramagnetic signal occurs due to the nonzero spontaneous supercurrent circulating in a loop consisting of odd number of π junctions. In addition to the d-wave mechanism we present the flux compression mechanism for the paramagnetic Meissner effect. The compression may be due to either an inhomogeneous superconducting transition or flux trap inside the giant vortex state. The flux trapping which acts like a total nonzero spontaneous magnetic moment causes the paramagnetic signal. The anisotropic pairing scenario is believed to be valid for granular materials while the flux trap one can be applied to both conventional and high-Tc superconductors. The study of different phenomena by a three-dimensional lattice model of randomly distributed π Josephson junctions with finite self-inductance occupies the main part of our review. By simulations one can show that the chiral glass phase in which chiralities are frozen in time and in space may occur in granular superconductors possessing d-wave pairing symmetry. Experimental attempts on the search for the chiral glass phase are analysed. Experiments on dynamical phenomena such as AC susceptibility, compensation effect, anomalous microwave absorption, aging effect, AC resistivity and enhancement of critical current by external electric fields are considered. These phenomena were studied by Monte Carlo and Langevin dynamics simulations which show satisfactory agreement with experiments. We present a resistively shunted junction model describing rich dynamics of Josephson junction networks.

show abstract

“…(17). Similar patterns were reported by different groups [139][140][141]. The pattern shown in [142] or by the size of the junction [143].…”

Section: Fig 17supporting

confidence: 73%

“…In a symmetric junction with equal geometries on the a and b faces, the critical current modulates according to [137,139] …”

Section: ∼ Tmentioning

confidence: 99%

Paramagnetic Meissner effect and related dynamical phenomena

2003

Physics Reports

View full text Add to dashboard Cite

show abstract

“…In S/insulator/D junctions, the nonmonotonic temperature dependence was observed experimentally in Ref. 45. We can qualitatively explain these data by regarding the barrier as a diffusive normally conducting material.…”

supporting

confidence: 66%

Theory of the Josephson effect in unconventional superconducting junctions with diffusive barriers

2007

View full text Add to dashboard Cite

We study theoretically the Josephson effect in junctions based on unconventional superconductors with diffusive barriers, using the quasiclassical Green's function formalism. Generalized boundary conditions at junction interfaces applicable to unconventional superconductors are derived by calculating a matrix current within the circuit transport theory. Applying these boundary conditions, we have calculated the Josephson current in structures with various pairing symmetries. A number of predictions are made: ͑a͒ nonmonotonic temperature dependence in d-wave superconductor/diffusive normal metal/d-wave superconductor ͑D/DN/D͒ junctions, ͑b͒ anomalous current-phase relations in p-wave superconductor/diffusive normal metal/p-wave superconductor ͑P/DN/P͒ junctions, ͑c͒ second harmonics in D/DN/D and P/DN/P junctions, ͑d͒ a double-peak structure of the critical current in D/DF/D junctions, and ͑e͒ enhanced Josephson current by the exchange field in S/DF/P junctions. We have also investigated peculiarities of the Josephson coupling in D/DF/D, P/DF/P, and S/DF/P junctions. An oscillatory behavior of the supercurrent and the second harmonics in the current-phase relation is studied as a function of the length of the diffusive ferromagnet.

show abstract

“…In the first one measures the critical current of a two junction loop as a function of the magnetic flux treading the ring and records the positions of the current maxima [3][4][5][6][7][8] . The second type consists of mapping the phase differences at the Josephson energy minima [9][10][11][12][13] .…”

Section: Introductionmentioning

confidence: 99%

Pinhole junctions in d-wave superconductors

Fogelström

Kurkijärvi

1996

Czech J Phys

View full text Add to dashboard Cite

We present a self consistent treatment of pinhole junctions in d x 2 −y 2 superconductors. The current-phase relation js(χ) is studied at different temperatures and at different angles α between the crystalâ-axis and the junction (surface) normal. We show that the critical current of a junction can be reduced by pair-breaking effects at the separation. We also study the Josephson energy of a pinhole as a function of the phase difference across the junction. In particular are mapped the positions of the energy minima χmin at different temperatures as functions of (αL, αR), the crystal orientations of the left and right superconductors. With decreasing temperature there is an increasing range of crystal orientations where χmin varies continuously from 0 to π.

show abstract

Experimental evidence for ad-wave pairing state inYBa2Cu3

Cited by 74 publications

References 17 publications

Paramagnetic Meissner effect and related dynamical phenomena

Paramagnetic Meissner effect and related dynamical phenomena

Theory of the Josephson effect in unconventional superconducting junctions with diffusive barriers

Pinhole junctions in d-wave superconductors

Contact Info

Product

Resources

About