New paramagnetic peculiarity of the superconductive transition detected by a highly sensitive OFC magnetometer

Samvel G. Gevorgyan, Takanobu Kiss, Tomokazu Ohyama, Masayoshi Inoue, Artur A. Movsisyan, Hovsep G. Shirinyan, Vardan S. Gevorgyan, Teruo Matsushita, Masakatsu Takeo

Research output: Contribution to journalArticle

9 Citations (Scopus)

Abstract

The improved 'LC-resonator' technique (the open-flat coil magnetometer), based on a low-power stable-frequency tunnel diode oscillator with a single-layer open-faced coil, is very sensitive to changes of position. About 1 Å absolute and better than 10-6 relative resolution can be reached in distance change measurements. It is an excellent MHz-range scientific instrument with which one may study weakly expressed fine peculiarities of the superconductive state in small-volume thin plate-like high-Tc superconductors (HTS). It enables changes to be detected of about 1 pH of the HTS film's magnetic inductance (changes of ∼1-3 Å of the magnetic penetration depth, λ) with very high (∼10-6) relative resolution. Owing to the pick-up coil's flat design, relatively low operation frequency and high relative resolution, the present method has advantages over others. It is essential for non-destructive studies of thin flat HTS materials (with a small signal) especially near Tc (at the beginning of the formation of 'Cooper' pairs). Mainly as the result of these advantages a new 'paramagnetic' peculiarity of the superconductive transition has been detected in Y-Ba-Cu-O film, which precedes the well known 'diamagnetic' ejection. A possible explanation of the observed effect is given, and the influence of some external physical parameters on the effect is revealed and discussed.

Original languageEnglish
Pages (from-to)1009-1013
Number of pages5
JournalSuperconductor Science and Technology
Volume14
Issue number12
DOIs
Publication statusPublished - Dec 1 2001

Fingerprint

Magnetometers
magnetometers
Superconducting materials
coils
Tunnel diode oscillators
Magnetic films
tunnel diodes
thin plates
magnetic films
inductance
ejection
Inductance
Resonators
penetration
resonators
oscillators

All Science Journal Classification (ASJC) codes

  • Ceramics and Composites
  • Condensed Matter Physics
  • Metals and Alloys
  • Electrical and Electronic Engineering
  • Materials Chemistry

Cite this

New paramagnetic peculiarity of the superconductive transition detected by a highly sensitive OFC magnetometer. / Gevorgyan, Samvel G.; Kiss, Takanobu; Ohyama, Tomokazu; Inoue, Masayoshi; Movsisyan, Artur A.; Shirinyan, Hovsep G.; Gevorgyan, Vardan S.; Matsushita, Teruo; Takeo, Masakatsu.

In: Superconductor Science and Technology, Vol. 14, No. 12, 01.12.2001, p. 1009-1013.

Research output: Contribution to journalArticle

Gevorgyan, SG, Kiss, T, Ohyama, T, Inoue, M, Movsisyan, AA, Shirinyan, HG, Gevorgyan, VS, Matsushita, T & Takeo, M 2001, 'New paramagnetic peculiarity of the superconductive transition detected by a highly sensitive OFC magnetometer', Superconductor Science and Technology, vol. 14, no. 12, pp. 1009-1013. https://doi.org/10.1088/0953-2048/14/12/305
Gevorgyan, Samvel G. ; Kiss, Takanobu ; Ohyama, Tomokazu ; Inoue, Masayoshi ; Movsisyan, Artur A. ; Shirinyan, Hovsep G. ; Gevorgyan, Vardan S. ; Matsushita, Teruo ; Takeo, Masakatsu. / New paramagnetic peculiarity of the superconductive transition detected by a highly sensitive OFC magnetometer. In: Superconductor Science and Technology. 2001 ; Vol. 14, No. 12. pp. 1009-1013.
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