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Wollman, David A.; Harlingen, D. J. Van; Giapintzakis, J.; Ginsberg, D. M.

doi:10.1103/physrevlett.74.797

Cited by 364 publications

(154 citation statements)

References 18 publications

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“…We show that the present theory explains observed oscillation patterns [28]. We also demonstrate that the "0-SQUID (or edge-junction)" and "π -SQUID (or cornerjunction)" patterns [29] that are usually attributed to the dwave symmetry of the order parameter, are shown to arise from evenness or oddness of the winding number of the Berry phase.…”

Section: Introductionmentioning

confidence: 58%

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Spin-vortex Superconductivity

Koizumi

2011

J Supercond Nov Magn

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We present a theory of superconductivity based on the theoretical prediction that a macroscopic persistent current is generated by spin-vortices. It explains the origin of the phase variable θ that is canonical conjugate to the superfluid density as a Berry phase arising from the spin-vortex formation. This superconductivity does not require Cooperpairs as charge carriers, thus, is not directly related to the standard theory based on the BCS one; however, it exhibits the flux quantization in the unit Φ 0 = hc/2|e|, where h is Planck's constant, c the speed of light, and e the electron charge; and the AC Josephson frequency, f J = 2|e|V /h, where V is the voltage of the battery connected to the superconductor-insulator-superconductor junction. In due course, it is found that the standard derivation of the AC Josephson frequency misses a term arising from the flow of particles through the leads connected to the junction. If this contribution is included, the observed f J indicates that the phase θ is a variable conjugate to the number density of charge e carriers instead of the currently accepted charge 2e carriers. We propose an experiment that discriminates whether it is e or 2e. If the above claim is verified, it means that the BCS theory cannot predict whether a particular compound is a superconductor or not since it does not explain the origin of θ . A connection between the present mechanism and the BCS mechanism is discussed; the fact that the BCS theory gives an excellent estimate of T c is attributed to the fact that it predicts the temperature at which spin-vortices become long-lived due to the energy gap formation; since the stabilization by the electron-pair formation is compatible with the present mechanism, asymmetries observed in the H. Koizumi ( ) Institute of Materials Science, University of Tsukuba, Tsukuba, Ibaraki 305-8573, Japan e-mail: koizumi@ims.tsukuba.ac.jp even and odd number of electron systems are preserved. The most notable difference is that the persistent current generation is formulated in a strictly particle-number-conserving manner. Thus, it does not violate the superselection rule for the total charge.

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Section: Introductionmentioning

confidence: 58%

“…5, if even w ring and odd w ring cases are separately realized, the so-called "0-SQUID (or edgejunction)" pattern and the "π -SQUID (or corner-junction)" pattern are obtained, respectively [29]. The appearance of these patterns are currently attributed to the d-wave symmetry of the order parameter.…”

Section: Macroscopic Quantum Interferencementioning

confidence: 99%

Spin-vortex Superconductivity

Koizumi

2011

J Supercond Nov Magn

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“…Nevertheless, these phase-insensitive techniques have produced a large body of evidence for d-wave pairing in the cuprates. The recent development of phase-sensitive pairing symmetry test [2][3][4][5][6][7], has yielded compelling evidence for predominantly dwave pairing symmetry in a number of optimally doped cuprates [8]. A question naturally arises: How universal is the d x 2 −y 2 pairing in cuprate superconductors?…”

Section: Introductionmentioning

confidence: 99%

d-wave pairing symmetry in cuprate superconductors

Tsuei¹,

Kirtley²

2000

Physica C: Superconductivity

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Phase-sensitive tests of pairing symmetry have provided strong evidence for predominantly d-wave pairing symmetry in both the hole-and electron-doped high-Tc cuprate superconductors. Temperature dependent measurements in YBa2Cu3O 7−δ (YBCO) indicate that the d-wave pairing dominates, with little if any imaginary component, at all temperatures from 0.5K through Tc. In this article we review some of this evidence and discuss the implications of the universal d-wave pairing symmetry in the cuprates.

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“…Over the last few years, experiments [3] have convincingly established that the superconducting state of the hole-doped cuprate materials is characterized by spin singlet d x 2 −y 2 pairing. In such a superconductor, the gap vanishes at four points on the (two-dimensional) Fermi surface.…”

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confidence: 99%

Quasiparticle Transport and Localization in High-TcSuperconductors

et al. 1998

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We present a theory of the effects of impurity scattering in d x 2 −y 2 superconductors and their quantum disordered counterparts, based on a non-linear sigma model formulation. We show the existence, in a quasi-two-dimensional system, of a novel spin-metal phase with a non-zero spin diffusion constant at zero temperature. With decreasing inter-layer coupling, the system undergoes a quantum phase transition (in a new universality class) to a localized spin-insulator. Experimental implications for spin and thermal transport in the high-temperature superconductors are discussed.

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Evidence fordx2−y2Pairing from the Magnetic Field Modulation of Y

Cited by 364 publications

References 18 publications

Spin-vortex Superconductivity

Spin-vortex Superconductivity

d-wave pairing symmetry in cuprate superconductors

Quasiparticle Transport and Localization in High-TcSuperconductors

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