STUDY OF FINE PECULIARITIES OF HEAT CAPACITY IN YBa$_2$Cu$_3$O$_y$ FILMS BY MEANS OF THE LASER-COUPLED FLAT-COIL-OSCILLATOR

S.G. Gevorgyan; G.H. Karapetyan; H.G. Shirinyan; S.T. Muradyan; G.S. Gevorgyan; B.K. Kurghinyan; V.S. Gevorgyan; A.A. Polyanskii

doi:10.46991/PYSU:A/2011.45.1.049

Authors

S.G. Gevorgyan Center on Superconductivity & Scientific Instrumentation, Chair of Solid State Physics, YSU, Institute for Physical Research, NAS, Armenia
G.H. Karapetyan Center on Superconductivity & Scientific Instrumentation, Chair of Solid State Physics, YSU, Institute for Physical Research, NAS, Armenia
H.G. Shirinyan Institute for Physical Research, NAS, Armenia
S.T. Muradyan Center on Superconductivity & Scientific Instrumentation, Chair of Solid State Physics, YSU, Russian-Armenian (Slavonic) State University, Armenia
G.S. Gevorgyan Center on Superconductivity & Scientific Instrumentation, Chair of Solid State Physics, Chair of Optics, YSU, Armenia
B.K. Kurghinyan Center on Superconductivity & Scientific Instrumentation, Chair of Solid State Physics, YSU, Armenia
V.S. Gevorgyan Center on Superconductivity & Scientific Instrumentation, Chair of Solid State Physics, YSU, Institute for Physical Research, NAS, Armenia
A.A. Polyanskii Applied Superconductivity Center, National High Magnetic Field Laboratory, 2031 East Paul Dirac Drive, Tallahassee, FL 32310, USA

DOI:

https://doi.org/10.46991/PYSU:A/2011.45.1.049

Keywords:

Cryogenic laser scanning microscope (CLSM), imaging technique, heat capacity of YBa$_2$Cu$_3$O$_y$ film, high-$T_c$ superconductive (HTS) & low-$T_c$ superconductive (LTS) materials, normal-to-superconductive (N/S) phase transition, single-layer flat-coil-oscillator test-method (SFCO-technique)

Abstract

Improvements in the “hybrid” imaging method, based on traditional Laser Scanning Microscopy in combination with the single-layer flat-coil-oscillator (SFCO) sensitive technique introduced by authors earlier, are discussed. This method is capable of imaging 2D-grained structure, as well as the normal-to-superconductive phase transition in flat thin high-Tc superconductive materials with 1–2 μm spatial resolution. It enabled to detect weakly expressed peculiarities of the heat capacity in YBa₂Cu₃O_y film (preceding the well-known specific heat “jump”), which are important for true understanding of the real nature of superconductivity phenomenon. The method uses a well-focused He-Ne laser beam as a probing signal, and the SFCO-technique as a high-resolution sensing tool.