Physics of the Solid State
Volumes and Issues
Jump quantum phase transitions in a vortex sistem and the dinamic complex magnetic permeability of high-temperature binary YBa2Cu3O7-x superconductors
Rostami H P.1
1Fryazino Branch, Kotel’nikov Institute of Radio Engineering and Electronics, Russian Academy of Sciences, Fryazino, Moscow oblast, Russia
Email: rostami@ms.ire.rssi.ru

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A nonlocal high-frequency method for measuring the dynamic complex magnetic permeability with enhanced spatial resolution is developed to simultaneously determine the bulk and local character of stepwise penetration of a magnetic flux through twin boundaries (TBs) into a YBa2Cu3O7-x HTSC sample during its stepwise decomposition into twins. By the values of fields corresponding to the regions of steps, the thermodynamic first critical magnetic fields are determined: the penetration of a flux into a sample - a Josephson medium; the development of a critical state in the Josephson medium; the penetration of a flux into twins; and the values of the critical fields of phase transitions in the vortex system of the HTSC sample, such as the melting fields of a vortex crystal, the formation of a superconducting glass state in the sample, and the transition to the vortex glass and Bragg glass states. Keywords: high-frequency inductance, bulk and local dynamic complex magnetic permeability, magnetic flux trapping, effective demagnetization factor, twins (monodomains, crystallites, sub- and nanocrystallites), twin boundaries.
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Ioffe Institute

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