Magnetic levitation using high-temperature superconductors: a materials perspective

Chen, Q.Y.

doi:10.1109/19.199416

Cited by 6 publications

(4 citation statements)

References 5 publications

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“…helium is briefly described in [29]). In addition, the latent heat of evaporation of helium-4 is much lower than that of liquid nitrogen (20.6 J g −1 and 199 J g −1 , respectively, at their boiling temperatures 4 ) and so it evaporates very quickly in a simple dewar as the one used here.…”

Section: Methodsmentioning

confidence: 97%

“…Meissner effect, i.e. the expulsion of magnetic field from a superconducting material, has been studied extensively, both from the theoretical and experimental points of view [1][2][3][4][5][6][7][8]. 1 To explain analytically the observed results different methods are used [11,12], which are, for some simple situations, tractable by students.…”

Section: Introductionmentioning

confidence: 99%

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Magnetic levitation on a type-I superconductor as a practical demonstration experiment for students

Osorio¹,

Lahera²,

Suderow³

2012

Eur. J. Phys.

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Abstract. We describe and discuss an experimental set-up which allows undergraduate and graduate students to view and study magnetic levitation on a type-I superconductor. The demonstration can be repeated many times using one readily available 25 liter liquid helium dewar. We study the equilibrium position of a magnet that levitates over a lead bowl immersed in a liquid hand-held helium cryostat. We combine the measurement of the position of the magnet with simple analytical calculations. This provides a vivid visualization of magnetic levitation from the balance between pure flux expulsion and gravitation. The experiment contrasts and illustrates the case of magnetic levitation with high temperature type-II superconductors using liquid nitrogen, where levitation results from partial flux expulsion and vortex physics.

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Section: Methodsmentioning

confidence: 97%

Section: Introductionmentioning

confidence: 99%

Magnetic levitation on a type-I superconductor as a practical demonstration experiment for students

Osorio¹,

Lahera²,

Suderow³

2012

Eur. J. Phys.

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“…The levitation observed when approaching superconducting samples and magnets has been extensively studied [15,16,17]. The Meissner effect i.e., the expulsion of the magnetic field from the superconductor, is a consequence of the existence of supercurrents which cancel the magnetic field in any point of the superconductor.…”

Section: Meissner Effect and Levitationmentioning

confidence: 99%

“…The levitation observed when approaching superconducting samples and magnets has been extensively studied [15,16,17]. The ¶ See, for instance, references [10,11].…”

Section: Meissner Effect and Levitationmentioning

confidence: 99%

Demonstration experiments for solid-state physics using a table-top mechanical Stirling refrigerator

Osorio¹,

Palacio-Morales²,

Rodrigo³

et al. 2012

Eur. J. Phys.

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Liquid free cryogenic devices are acquiring importance in basic science and engineering. But they can also lead to improvements in teaching low temperature an solid state physics to graduate students and specialists. Most of the devices are relatively expensive, but small sized equipment is slowly becoming available. Here, we have designed several simple experiments which can be performed using a small Stirling refrigerator. We discuss the measurement of the critical current and temperature of a bulk YBa 2 Cu 3 O 7−δ (YBCO) sample, the observation of the levitation of a magnet over a YBCO disk when cooled below the critical temperature and the observation of a phase transition using ac calorimetry. The equipment can be easily handled by students, and also used to teach the principles of liquid free cooling.

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Hybrid high Tc superconducting magnetic bearings for flywheel energy storage system

Chen¹,

Xia²,

Ma³

et al. 1994

Applied Superconductivity

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Magnetic levitation using high-temperature superconductors: a materials perspective

Cited by 6 publications

References 5 publications

Magnetic levitation on a type-I superconductor as a practical demonstration experiment for students

Magnetic levitation on a type-I superconductor as a practical demonstration experiment for students

Demonstration experiments for solid-state physics using a table-top mechanical Stirling refrigerator

Hybrid high Tc superconducting magnetic bearings for flywheel energy storage system

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