Direct mechanical measurement of pinning forces on type-II superconductors

Eggendorfer, G.

doi:10.1007/bf00655461

Cited by 10 publications

(3 citation statements)

References 21 publications

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“…In an experiment devised by EGGENDORFER [EGG73], the sample in the form of a disc is suspended from a torsion balance in a magnetic field directed along the axis of suspension. Suitably attached leads permit current to flow radially across the sample.…”

Section: Torque Magnetometrymentioning

confidence: 99%

Applied Superconductivity, Metallurgy, and Physics of Titanium Alloys

Collings¹

1986

207

125

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All rights reservedNo part of this book may be reproduced, stored in a retrieval system, or transmitted in any form or by any means, electronic, mechanical, photocopying, microfilming, recording, or otherwise, without written permission from the Publisher To BETTY JANE AND CHRISTOPHER also to an international community of low-temperature physicists and cryogenic engineers whose work is represented on these pagesType-2 Superconductor in the Critical Mixed State.-Carbon-replicated electron micrograph of a ferromagnetic-particle-decorated representation of the arrangement of axially directed flux lines in an annealed-and-deformed Pb-In(6.3 at.OJo) 4-mm!6 rod in the trapping critical state (see, e.g., Figure 16-7). The arrangement of the flux lines was found to change continuously from long-range-ordered in the relatively high field (-70 G) interior region of the sample (;;, 400 ,an deep) [left-hand plate], to amorphous in the low-residual-field region just below the surface (,,; 100,an deep) [right-hand plate]. In this material, for which K = 2 at 1.2 K, the flux-lattice parameter at 70 G is about 0.6 I'm. Original micrograph courtesy of U. Essmann, Max-Planck-Institute fUr Metallforschung, Institut fUr Physik, Stuttgart, West Germany. (Reference: H. Trauble and U. Essmann, J. Appl. Phys. 39,4052-4059 (1968))1.General Preface xi property optimization. (iii) Superconductor and superconducting magnet design engineers for whom the chapters on Stability, AC Loss, and Conductor Design are intended. (iv) Manufacturers of "NbTi" alloy superconductors who wish to become reapprised of the Ti-alloy metallurgy and metal physics that underlies the behavior and properties of their product. Administrative Credits and Genesis

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Section: Torque Magnetometrymentioning

confidence: 99%

Applied Superconductivity, Metallurgy, and Physics of Titanium Alloys

Collings¹

1986

207

125

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“…A deviation from this position causes a difference in the pulse durations, which is converted into adc output voltage of (11) controlling (12). The angular position of (7) and the sample with respect to (4) twisting angle of (5) is proportional to the compensating torque and can be measured by means of a linear potentiometer (14) connected to (13), whose output voltage via slip rings can be plotted with an XY recorder (15) as function of the applied field H0 or the rotational frequency f. A light barrier consisting of lamp (16), photodiode (17), and 100 equidistant holes near the outer circumference of (4) followed by a frequency-to-voltage converter (18) serves to measure f.…”

Section: Apparatusmentioning

confidence: 99%

“…A vortex element ds whose position is given by the vector r pointing from the rotational axis toward ds and which is moving with a velocity component v• perpendicular to ds contributes a torque aD=rxag (4) with dg = kv(v•177 ds + ~v• ds. Summing over all individual contributions gives the total torque acting on the sample:…”

Section: Analysis Of Torquementioning

confidence: 99%

Magnetization and torque measurements on rotating niobium cylinders and ellipsoids

1978

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The magnetization and torque of niobium samples of different shapes rotating in a magnetic field are studied with emphasis on the behavior near the upper critical field He2. The observed rotational magnetization is free of hysteresis and is found to represent a good approximation to the thermodynamic equilibrium magnetization of the samples if pinning is not too strong and the frequency of rotation is sufficiently low. The viscous contribution to the torque exhibits a step at HoE whose dependence on sample geometry is in good agreement with predictions derived under the simple assumption of a homogeneous arrangement of parallel straight vortices in the rotating sample.

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