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Low energy neutron scattering in the vicinity of the superconducting phase transition

 

作者: N. Bernhoeft,  

 

期刊: Neutron News  (Taylor Available online 1993)
卷期: Volume 4, issue 1  

页码: 21-23

 

ISSN:1044-8632

 

年代: 1993

 

DOI:10.1080/10448639308218931

 

出版商: Taylor & Francis Group

 

数据来源: Taylor

 

摘要:

It has been of interest for a number of years to ask whether one can use the neutron-electron scattering cross-section as a probe of the superconducting phase transition in a manner analogous to that employed so successfully in magnetic metals (1,2). Such an approach may yield dynamic microscopic detail critical in shaping our picture of the superconducting state. As in the case of magnetic metals, which may be most readily understood in the regime where they are strongly exchange enhanced but still retain the symmetry of the normal paramagnetic ground state, we focus attention on scattering cross-section in the normal phase just above the superconducting transition. Until recently, the relatively low temperatures and long length scales involved in the phenomena of superconductivity reduced the possibilities of observation of neutron scattering frolh enhance conductivity fluctuations to the marginal level. Little effort appears to have been expended in this direction. We were stimulated to attempt such experiments early in 1987 by the discovery of the “Hi-Tc” superconducting ceramics for which the high transition temperatures enable significant thermal population to be put into low energy excitations and, second, the contracted spatial scale of pairing, more or less implied by the high transition temperatures and, hence, the inferred effective binding energy which allows measurements to be performed at experimentally accessible scattering angles.

 

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