LEVITATION AND SUSPENSION FORCES MEASUREMENT SYSTEM FOR HIGH TC SUPERCONDUCTORS

The interaction forces, attraction (suspension) and repulsion (levitation) between a permanent magnet and diferent bulk Yttrium-based superconductors were carried out with an automatic system developed in our group, which is reproducible, reliable and low cost. Two superconducting samples of YBa2Cu3O7-δ (YBCO) prepared by solid-state reaction method (S) and by the melt-textured growth method (MTG) were used. Both samples were characterized by XRD technique and presented the characteristic peaks and intensity relations of the YBCO-123 superconducting phase. Oxygen deficiencies δ > 0,15 and δ < 0,10 for the S and MTG samples respectively, were observed. Both samples displayed diferent hysteresis behavior in the Force (F) vs. Distance (z) measurements when they were field cooled (FC) and zero field cooled (ZFC). This behavior agrees with hysteresis loops observed in magnetization measurements. Both levitation and suspension phenomena were observed in the MTG sample with large hysteresis loops of the force. On the contrary, the S sample with small hysteresis loops did not show a suspension force, only displayed a slight levitation force.

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Attraction and repulsion forces in melt-textured and sintered YBCO-superconductors: a comparative study

Revista Facultad de Ingeniería Universidad de Antioquia ◽

10.17533/udea.redin.20191044 ◽

2020 ◽

pp. 44-50

Author(s):

Diego Andrés Arias-Arana ◽

Juan Diego Rojas-Zambrano ◽

Álvaro Mariño-Camargo

Keyword(s):

Low Cost ◽

Sintered Sample ◽

Interaction Force ◽

Solid State Reaction Method ◽

Zero Field ◽

Bulk Superconductors ◽

Ybco Superconductors ◽

Growth Method ◽

Magnetic Flux Pinning ◽

Field Cooling

In this paper, we measure the attraction (suspension) and repulsion (levitation) forces produced by the interaction between a permanent magnet and different bulk superconductors. The measurements of the interaction force HTS-PM were carried out with a relatively simple technique developed by us, which is reproducible, reliable and low cost. The obtained results were analyzed with the Bean’s critical-state model assuming a uniform magnetic field applied to the superconductor. Two superconducting samples of YBa2Cu3O7-δ (YBCO) prepared by solid-state reaction method and by the melt-textured growth method (MTG) were used. Both samples presented a different hysteresis behaviour in the field cooling (FC) and zero field cooling (ZFC) regimes. Levitation and suspension phenomena were observed in the MTG sample; however, the sintered sample (S) with Oxygen deficiencies (δ > 0.15) displayed a slight levitation force but did not show a suspension force, the latter one attributed to a more efficient magnetic flux pinning. Additionally, the critical current density of both samples was determined from the maximum gap of the force (ΔF) in the FC regime. The obtained values were between 43.00 A/cm2 and 2,758 A/cm2 for the sintered and MTG samples, respectively. These values show a remarkable difference between sintered and MTG samples like that observed from magnetization measurements, which indicate that attraction and repulsion force measurements could provide a rapid and reliable characterization method of polycrystalline superconducting samples.

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MAGNETIC PROPERTIES OF THE HIGH Tc SUPERCONDUCTORS BiSrCaCuO AND TlBaCaCuO

International Journal of Modern Physics B ◽

10.1142/s0217979289000051 ◽

1989 ◽

Vol 03 (01) ◽

pp. 77-85 ◽

Cited By ~ 3

Author(s):

Y. D. DAI ◽

C. LIN ◽

W. B. ZHANG ◽

S. Q. FENG ◽

X. ZHU ◽

...

Keyword(s):

Magnetic Properties ◽

Flux Pinning ◽

Magnetic Hysteresis ◽

Hysteresis Loops ◽

High Tc Superconductors ◽

Magnetic Current ◽

High Tc ◽

Bean Model ◽

Current Densities ◽

Magnetic Hysteresis Loops

Magnetic properties of the high T c superconductors BiSrCaCuO and TlBaCaCuO were investigated systematically. Magnetic current densities were calculated from magnetic hysteresis loops of bulk and powdered samples by Bean model. The results showed that flux pinning in these materials is much weaker than that in YBaCuO.

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LOW TEMPERATURE ELASTIC BEHAVIOR OF POTASSIUM-DOPED Bi-2212 SINGLE PHASE HIGH Tc SUPERCONDUCTORS

Modern Physics Letters B ◽

10.1142/s0217984994001096 ◽

1994 ◽

Vol 08 (18) ◽

pp. 1097-1106 ◽

Cited By ~ 6

Author(s):

B. GOPALA KRISHNA ◽

R. RAVINDER REDDY ◽

P. VENUGOPAL REDDY ◽

S. V. SURYANARAYANA

Keyword(s):

Single Phase ◽

Longitudinal Velocity ◽

Solid State Reaction Method ◽

Elastic Behavior ◽

Velocity Measurements ◽

High Tc Superconductors ◽

Qualitative Explanation ◽

High Tc ◽

Pulse Transmission ◽

Transmission Technique

A single phase Bi-2212 and two potassium-doped Bi-2212 samples have been prepared by the solid state reaction method. After the usual characterisation, the ultrasonic longitudinal velocity measurements of all the samples over a temperature range of 80–300 K were undertaken by the pulse transmission technique. The longitudinal velocity of the undoped sample is found to vary in an anomalous way followed by a maximum at 140 K. On the other hand, in the case of the two K-doped ones, the velocity is found to vary with temperature in a normal way up to 120 K followed by a maximum at 105 and 100 K respectively. A qualitative explanation for the observed behavior in all the three cases is given.

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MICROWAVE ABSORPTION STUDIES ON HIGH-Tc SUPERCONDUCTORS AND RELATED MATERIALS VIII — ESR OF DPPH COATED ON BiSrCaCuO FILMS FABRICATED ON MgO (100) SUBSTRATES

Modern Physics Letters B ◽

10.1142/s0217984992001733 ◽

1992 ◽

Vol 06 (14) ◽

pp. 879-889

Author(s):

K. SUGAWARA ◽

S. TANAKA

Keyword(s):

Magnetic Field ◽

Film Thickness ◽

Temperature Dependence ◽

Applied Magnetic Field ◽

Zero Field ◽

Magnetic Field Effects ◽

High Tc Superconductors ◽

Thick Sample ◽

High Tc ◽

Absorption Studies

ESR of DPPH coated on Bi - Sr - Ca - Cu - O films fabricated on MgO (100) substrates by MOCVD have been studied for samples with different thicknesses, 1000 Å and 100 Å. Temperature dependence of the ESR peak-to-peak linewidth, ΔH pp , revealed that ΔH pp , increases with film thickness. The excess ESR linewidth, δ (ΔH pp ) was also analyzed in terms of (1-t)α, with t=T/T c , giving for example α=4±1 for the 1000 Å thick sample. The ESR lineshapes were distorted by rotating the samples in applied magnetic fields. Severe distortion was found for the 1000 Å sample below about 30 K, but the distortion almost disappears at temperatures above 30 K. The applied magnetic field effects were also examined in both field-cooled and zero-field-cooled cases.

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Low-field microwave effects in zero-field-cooled high-Tc superconductors

Physica C Superconductivity ◽

10.1016/0921-4534(89)90039-7 ◽

1989 ◽

Vol 161 (1) ◽

pp. 39-47 ◽

Cited By ~ 22

Author(s):

I. Ciccarello ◽

M. Guccione ◽

M.Li Vigni

Keyword(s):

Zero Field ◽

High Tc Superconductors ◽

High Tc ◽

Low Field ◽

Microwave Effects

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A theoretical study for temperature dependence of levitation force of high-Tc superconductors

Physica C Superconductivity ◽

10.1016/j.physc.2012.10.001 ◽

2013 ◽

Vol 485 ◽

pp. 30-34 ◽

Cited By ~ 8

Author(s):

F. Inanir ◽

Ş. Yildiz ◽

M. Okutan ◽

U. Kolemen

Keyword(s):

Temperature Dependence ◽

Theoretical Study ◽

Levitation Force ◽

High Tc Superconductors ◽

High Tc

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A theoretical analyzation of the microwave absorption near zero field for high Tc superconductors

Solid State Communications ◽

10.1016/0038-1098(90)90216-x ◽

1990 ◽

Vol 75 (8) ◽

pp. 643-646 ◽

Cited By ~ 3

Author(s):

Juh Tzeng Lue ◽

Cho-Chin Wu

Keyword(s):

Microwave Absorption ◽

Zero Field ◽

High Tc Superconductors ◽

High Tc

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A zero-field Cu-NMR study on antiferromagnetic ordered state in four-layered high-Tc superconductors Ba2Ca3Cu4O8(FyO1-y)2

Physica C Superconductivity ◽

10.1016/j.physc.2010.01.012 ◽

2010 ◽

Vol 470 ◽

pp. S211-S212

Author(s):

S. Shimizu ◽

H. Mukuda ◽

Y. Kitaoka ◽

H. Kito ◽

Y. Kodama ◽

...

Keyword(s):

Zero Field ◽

High Tc Superconductors ◽

High Tc ◽

Nmr Study ◽

Ordered State

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INFLUENCE OF WAITING TIME ON THE LEVITATION FORCE BETWEEN A PERMANENT MAGNET AND A SUPERCONDUCTOR

Modern Physics Letters B ◽

10.1142/s0217984908014900 ◽

2008 ◽

Vol 22 (07) ◽

pp. 499-506 ◽

Cited By ~ 7

Author(s):

XING-YI ZHANG ◽

YOU-HE ZHOU ◽

JUN ZHOU

Keyword(s):

Permanent Magnet ◽

Liquid Nitrogen ◽

Waiting Time ◽

Levitation Force ◽

Liquid Nitrogen Temperature ◽

Zero Field ◽

Bulk Superconductors ◽

Growth Method ◽

Ndfeb Permanent Magnet ◽

Ybacuo Bulk

This paper describes the experimental results of the levitation force of single-grained YBaCuO bulk superconductors preparing by the top-seeded melt-growth method with different waiting time tw below an NdFeB permanent magnet. It was found that waiting time has large effects on the zero-field-cooled (ZFC) and field-cooled (FC) levitation force, and the levitation force shows aging characteristics at the liquid nitrogen temperature.

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