Microwave propagation through superconductor-polymer composites

M. Golosovsky; M. Tsindlekht; D. Davidov

doi:10.1103/PhysRevB.46.11439

← Back to search

Microwave propagation through superconductor-polymer composites

M. Golosovsky, M. Tsindlekht, D. Davidov

DOI 10.1103/PhysRevB.46.11439 · Physical Review B

T1

Active bibliographic source — not scientific approval

Bibliographic access preserves source history; it does not approve extracted materials or validate reported claims. Review warnings on each occurrence separately.

Abstract

We report on microwave and low-frequency properties of composites consisting of YBa2Cu3O7−x (YBCO) or Bi2Sr2CaCu2Ox grains embedded in a polymer matrix with strong emphasis on microwave transmission experiments through YBCO-polymer composites. The low-frequency conductivity vs the YBCO volume fraction f can be described by a three-dimensional percolation model with a percolation threshold of fp≃0.2. The microwave phase velocity and the transmission coefficient are significantly larger in the superconducting state of the grains compared to their normal-state values. These parameters are sensitive to the external magnetic field in the superconducting state. The increase of the phase velocity in the superconducting state is attributed to the change of the effective magnetic permeability which is in conflict with previous theoretical predictions.

Source-reported materials — not catalogue approval

Formula	Reported Tc (K)	Pressure (GPa)	Type
YBa2Cu3O7-x Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	91	Pressure not reported	onset
Bi2Sr2CaCu2Ox Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	—	Pressure not reported	unknown