TY - JOUR
T1 - Weakly expressed "paramagnetic" peculiarity of the superconductive transition detected in YBaCuO film by highly sensitive OFC-magnetometer
AU - Gevorgyan, S. G.
AU - Kiss, T.
AU - Inoue, M.
AU - Movsisyan, A. A.
AU - Shirinyan, H. G.
AU - Gevorgyan, V. S.
AU - Matsushita, T.
AU - Takeo, M.
N1 - Funding Information:
This study was partly supported by the New Energy and Industrial Technology Development Organization (NEDO) as Collaborative Research and Development of Fundamental Technologies for Superconductivity Applications. A.A.M., H.G.S. and V.S.G. acknowledge the support of this work by the “Armenian Foundation for the Basic Research” under the grant no. 01-431. Besides, S.G.G. thanks also to Prof. V.F. Gantmakher for his useful comments and advice on PM effect discussed in this paper after its observation in tin grains many years before, which strongly stimulated further investigations in this area in thin films discussed here.
PY - 2002/10/1
Y1 - 2002/10/1
N2 - 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.
AB - 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.
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U2 - 10.1016/S0921-4534(02)01455-7
DO - 10.1016/S0921-4534(02)01455-7
M3 - Article
AN - SCOPUS:18744426297
SN - 0921-4534
VL - 378-381
SP - 404
EP - 408
JO - Physica C: Superconductivity and its Applications
JF - Physica C: Superconductivity and its Applications
IS - PART 1
ER -