Construction of the magnetic phase diagram in small-volume HTS by an OFC magnetometer

Citation
Sg. Gevorgyan et al., Construction of the magnetic phase diagram in small-volume HTS by an OFC magnetometer, IEEE APPL S, 11(1), 2001, pp. 3931-3934
Citations number
13
Language
INGLESE
art.tipo
Article
Categorie Soggetti
Apllied Physucs/Condensed Matter/Materiales Science
Journal title
IEEE TRANSACTIONS ON APPLIED SUPERCONDUCTIVITY
ISSN journal
1051-8223 → ACNP
Volume
11
Issue
1
Year of publication
2001
Part
3
Pages
3931 - 3934
Database
ISI
SICI code
1051-8223(200103)11:1<3931:COTMPD>2.0.ZU;2-R
Abstract
We applied the OFC magnetometer for studies of vortex dynamics in small-vol ume HTS. The substitution of the solenoid coil by a flat one in a tunnel di ode oscillator made the coil's filling factor maximal fur flat specimens cn abling to reach 1-3 Angstrom absolute and 10(-6) relative changes of the pe netration depth, lambda of RF magnetic field into HTS films. Oar technique operates in high magnetic fields and measures linear changes of lambda in 1 mm range with high resolution. It is also an excellent Q-meter for detectio n of changes similar to 10(-9)W of the absorption in HTS samples, Such abil ities allow it to be applied in many fields of science and technology. In p articular, detection of the magnetic field-dependent changes of the frequen cy and amplitude of a 23MHz oscillator enabled lines on the magnetic phase diagram for Y-Ba-Cu-O film to be constructed. It seems to have many similar ities as compared to the diagrams defined for bulk HTS by the other methods . However, how close is the relation in bet, may be revealed after addition al tests on the same quality specimens.