Complicated shape of the superconductive transition curve revealed by a sensitive OFC-magnetometer

Samvel Gevorgyan, Takanobu Kiss, Hovsep Shirinyan, Artur Movsisyan, Vardan Gevorgyan, Shinichi Egashira, Yuri Eltsev, Teruo Matsushita, Toshiyuki Mito, Masakatsu Takeo

Research output: Contribution to journalConference articlepeer-review

Abstract

Because of pick-up coil's flat design, relatively low operation frequency (∼ 23 MHz) and high relative resolution (10-6) a single-layer Open-Flat Coil-based tunnel diode oscillator (OFC-magnetometer) has advantages, compared to other test methods. They become crucial at nondestructive studies with thin flat HTS materials (with small signals), especially near Tc (at start of the 'Cooper' pairs' formation). Due to these a new 'Para-Magnetic' peculiarity of the normal-to-superconductive (N/S) transition was detected recently in YBaCuO films. It precedes the 'Meissner' ejection and specifies details of. an actually complicated shape of the N/S transition curve. We discuss influence of the currents and magnetic field on the PM effect and relationship between the quality of HTS material and amplitude of the effect. Differences between PM effect and externally close 'paramagnetic Meissner' and resistive 'peak' effects are discussed too.

Original languageEnglish
Pages (from-to)3574-3577
Number of pages4
JournalIEEE Transactions on Applied Superconductivity
Volume13
Issue number2 III
DOIs
Publication statusPublished - Jun 1 2003
Event2002 Applied Superconductivity Conference - Houston, TX, United States
Duration: Aug 4 2002Aug 9 2002

All Science Journal Classification (ASJC) codes

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics
  • Electrical and Electronic Engineering

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