Second harmonics and compensation effect in ceramic superconductors

Li, Mai Suan

doi:10.1103/physrevb.60.118

Phys. Rev. B

1999

DOI: 10.1103/physrevb.60.118

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Second harmonics and compensation effect in ceramic superconductors

Mai Suan Li

Abstract: A three-dimensional lattice of the Josephson junctions with a finite self-conductance is employed to model the ceramic superconductors. The nonlinear ac susceptibility and the compensation effect are studied by Monte Carlo simulations in this model. The compensation effect is shown to be due to the existence of the chiral glass phase. We demonstrate, in agreement with experiments, that this effect may be present in the ceramic superconductors which show the paramagnetic Meissner effect.Comment: 6 pages, latex,… Show more

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Cited by 7 publications

References 29 publications

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Paramagnetic Meissner effect and related dynamical phenomena

2003

Physics Reports

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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.

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Paramagnetic Meissner effect and related dynamical phenomena

2003

Physics Reports

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ac susceptibility in granular superconductors: theory and experiment

Kunold¹,

Hernandez²,

Myszkowski³

et al. 2002

Physica C: Superconductivity

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Narrow dip around zero magnetic field in magnetization hysteresis loops of thin YBCO superconducting films

Delimova¹,

Liniichuk²,

Lähderanta³

et al. 2002

Supercond. Sci. Technol.

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A narrow dip is observed around zero magnetic field in magnetization curves M(B) of superconducting YBCO films with about 10 nm thickness. This anomaly occurs in the same field range with an anomaly of ac surface impedance Z(B) found recently in thin YBCO films. Because the thickness of our films is considerably less than the London penetration depth, two-dimensional limit of the critical state model is applied. In the framework of this model the magnetic field dependence of the critical current density j c (B) is found. The obtained j c (B) function agrees well with that found in the ac surface impedance investigation.

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Second harmonics and compensation effect in ceramic superconductors

Cited by 7 publications

References 29 publications

Paramagnetic Meissner effect and related dynamical phenomena

Paramagnetic Meissner effect and related dynamical phenomena

ac susceptibility in granular superconductors: theory and experiment

Narrow dip around zero magnetic field in magnetization hysteresis loops of thin YBCO superconducting films

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