Weakly expressed "paramagnetic" peculiarity of the superconductive transition detected in YBaCuO film by highly sensitive OFC-magnetometer

S. G. Gevorgyan, T. Kiss, M. Inoue, A. A. Movsisyan, H. G. Shirinyan, V. S. Gevorgyan, T. Matsushita, M. Takeo

Research output: Contribution to journalArticle

1 Citation (Scopus)

Abstract

Single-layer open-flat coil-based tunnel diode oscillator (OFC-magnetometer) is sensitive to small changes of penetration depth of MHz-range magnetic field into plate-like high-Tc superconductivity (HTS) materials. Δ λ ∼ 1-3 Å absolute and better than Δ λ / λ ∼ 10-6 relative resolution is reached, which corresponds to changes ∼ 1 pH of HTS film's magnetic inductance. It operates in high magnetic fields and measures the linear changes of λ in a wide dynamic range. Owing to pick-up coil's flat design, relatively low operation frequency and high relative resolution this method has advantages, compared to others, which become crucial at non-destructive studies with thin flat HTS materials (with a small signal), especially near Tc (at the start of "Cooper" pairs' formation). Due to these, a new "paramagnetic" (PM) peculiarity of superconductive transition was detected in YBaCuO film recently, which precedes well-known "diamagnetic" ejection. It specifies the details of an actually complicated shape of the N/S transition curve. In this report we discuss influence of the magnetic field on PM effect and relationship between the quality of HTS film and the amplitude of the effect. Differences between the PM effect and the known, externally similar, resistive "peak" as well as "paramagnetic Meissner" effects is shortly discussed too.

Original languageEnglish
Pages (from-to)404-408
Number of pages5
JournalPhysica C: Superconductivity and its applications
Volume378-381
Issue numberPART 1
DOIs
Publication statusPublished - Oct 1 2002

    Fingerprint

All Science Journal Classification (ASJC) codes

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

Cite this