Microwave Absorption in Granular Superconductors

Blazey, K. W.

doi:10.1007/978-3-642-84377-8_13

Cited by 13 publications

(3 citation statements)

References 55 publications

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“…(i) The flux flow related [13] losses occur when the fluxons are driven by rf or microwave currents. The viscosity of the fluxons in Josephson junctions is lower than that in bulk and therefore flux flow losses in the junctions, when present, dominate those in the bulk.…”

Section: Discussionmentioning

confidence: 99%

Competition between Josephson and electromagnetic interactions in single crystals

Sudershan

Rastogi

Bhat

et al. 1998

Supercond. Sci. Technol.

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We have studied the low magnetic field, high-temperature region of the H-T phase diagram of (Bi2212) single crystals by measuring magnetic field induced rf dissipation in the mixed state. Normally the rf power loss P(H) versus H in a superconductor increases with the increase in the field with a minimum at H = 0. However, in Bi2212 the rf loss initially decreases with increasing field, shows a minimum at a certain field and increases continuously beyond . We understand the unusual minimum at as resulting from a competition between (i) the increasing attractive electromagnetic interaction between the pancake vortices (that constitute the vortex line) in adjacent bilayers with the increasing field and (ii) the decreasing Josephson coupling between the CuO bilayers with the increase in the field. The line defines a new boundary in the H-T phase diagram at which the tilt modulus of the 2D vortex stack in Bi2212 is at a maximum. It is found to obey the behaviour with the exponent n = 3/2 reminiscent of the predicted behaviour of the melting line.

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Section: Discussionmentioning

confidence: 99%

Competition between Josephson and electromagnetic interactions in single crystals

Sudershan

Rastogi

Bhat

et al. 1998

Supercond. Sci. Technol.

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“…Let us first consider the field-free cases. The two-fluid model of superconductivity [67] gives 4 (7)…”

Section: Theoretical Backgroundmentioning

confidence: 99%

“…Microwave frequencies might be one of the best physical regions for devices based on high critical temperature superconductors (HTCSs), including ceramics [1][2][3]. Several reviews of microwave properties of superconductors can be found in [4][5][6][7]. It has been already observed that data are contradictory and even paradoxical.…”

Section: Introductionmentioning

confidence: 99%

The intrinsic effects of a magnetic field on the microwave properties of s or d order parameter symmetry in high- superconductors

Ausloos¹

1999

Supercond. Sci. Technol.

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A theoretical discussion of the intrinsic effects of a magnetic field on the real and imaginary parts of the ac electrical characteristics of superconductors is reported. The subsequent phenomenological theory emphasizes only the role of the scattering mechanisms of quasi-particles by static independent vortices. However both s- and d-wave order parameter symmetries are considered. Power laws for the field dependence at low temperature are obtained: , and , for an s and a d gap respectively, and while and . Since the published data do not seem to be (always) in agreement with these laws, this indicates effects of `extrinsic origin', e.g. granularity and weak links. A mixed order parameter symmetry cannot be ruled out in cases where these extrinsic effects occur.

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Superconductivity and Magnetic Properties of Spin-Ladder Compounds

Szymczak

Baran

et al. 2000

New Developments in High Temperature Superconductivity

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Microwave Absorption in Granular Superconductors

Cited by 13 publications

References 55 publications

Competition between Josephson and electromagnetic interactions in single crystals

Competition between Josephson and electromagnetic interactions in single crystals

The intrinsic effects of a magnetic field on the microwave properties of s or d order parameter symmetry in high- superconductors

Superconductivity and Magnetic Properties of Spin-Ladder Compounds

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