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Title: PERSISTENT CURRENTS AT FIELDS ABOVE 23 TESLA

Abstract

No abstract prepared.

Authors:
Publication Date:
Research Org.:
Los Alamos National Lab., NM (US)
Sponsoring Org.:
US Department of Energy (US)
OSTI Identifier:
788303
Report Number(s):
LA-UR-01-6034
TRN: US0302048
DOE Contract Number:
W-7405-ENG-36
Resource Type:
Conference
Resource Relation:
Conference: Conference title not supplied, Conference location not supplied, Conference dates not supplied; Other Information: PBD: 1 Oct 2001
Country of Publication:
United States
Language:
English
Subject:
71 CLASSICAL AND QUANTUM MECHANICS, GENERAL PHYSICS; MAGNETIC FIELDS; ELECTRIC CURRENTS; CORRELATIONS

Citation Formats

N. HARRISON. PERSISTENT CURRENTS AT FIELDS ABOVE 23 TESLA. United States: N. p., 2001. Web.
N. HARRISON. PERSISTENT CURRENTS AT FIELDS ABOVE 23 TESLA. United States.
N. HARRISON. Mon . "PERSISTENT CURRENTS AT FIELDS ABOVE 23 TESLA". United States. doi:. https://www.osti.gov/servlets/purl/788303.
@article{osti_788303,
title = {PERSISTENT CURRENTS AT FIELDS ABOVE 23 TESLA},
author = {N. HARRISON},
abstractNote = {No abstract prepared.},
doi = {},
journal = {},
number = ,
volume = ,
place = {United States},
year = {Mon Oct 01 00:00:00 EDT 2001},
month = {Mon Oct 01 00:00:00 EDT 2001}
}

Conference:
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  • Experimental studies made on organic conducting salts of the composition {alpha}-(BEDT-TTF) 2MHg(SCN)4 (where M = K, Tl and Rb) indicate that they exhibit persistent currents at magnetic fields exceeding 23 T. The presence of currents cannot be explained by the quantum Hall effect, while superconductivity seems unlikely. All indications point towards a new type of dissipationless current flow involving relative gradients in the pinning of a CDW and quantized orbital magnetism.
  • A review is given about the present possibilities to generate magnetic fields beyond 15 T. Whereas it seems feasible to build purely superconducting magnets for fields up to 20 T no conductors with the required critical data are available at present which allow the generation of higher fields. Magnetic fields beyond 15 T are generally produced by resistive, water cooled coils. If fields beyond 25 T have to be generated, problems are encountered because of the large amount of power which is necessary. In order to achieve the highest continuous magnetic fields, hybrid magnets can be built which consist ofmore » an inner resistive part and an outer superconducting coil. The limits of this technique are discussed for various conditions. 14 refs.« less
  • Interactions between localized and itinerant electrons give rise to a variety of classes of materials, including the heavy fermion metals and the Kondo insulators. In the Kondo insulators, a broad, half-filled conduction band is intersected by a nearly dispersionless f-level. Hybridization and correlations give rise to a low temperature quenching of the localized spins accompanied by a loss of carriers. Extremely high magnetic fields should destroy the Kondo interaction (antiferromagnetic coupling to the localized moment). For this reason, the authors have measured, in pulsed magnetic fields of 61 T, the longitudinal, transverse, and Hall resistivity of Ce{sub 3}Bi{sub 4}Pt{sub 3}.more » Samples with very different disorder reveal that magnetic fields above {approximately}20T suppress extrinsic low temperature behavior. A large negative magnetoresistance is found to be governed by spin interactions (longitudinal and transverse magnetoresistance are essentially identical). The negative magnetic resistance is accompanied by an equally dramatic increase in the number of carriers measured by the Hall resistivity. The data are consistent with the linear collapse of a spin excitation gap which closes at {approximately}50T. However, roughly constant carrier density from {approximately}50T to 61T suggests that the metallic behavior above 50T results from collapse of a coherence gap rather than simple energy band crossing.« less