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20 April 2024

» arxiv » cond-mat/9805225

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Hole depletion and localization due to disorder in insulating PrBa2Cu3O7-d: a Compton scattering study
Abhay Shukla ; Bernardo Barbiellini ; Andreas Erb ; Alfred A. Manuel ; Thomas Buslaps ; Veijo Honkimaki ; Pekka Suortti ;
Date:	19 May 1998
Subject:	Superconductivity \| cond-mat.supr-con
Abstract:	The (mostly) insulating behaviour of PrBa2Cu3O7-d is still unexplained and even more interesting since the occasional appearance of superconductivity in this material. Since YBa2Cu3O7-d is nominally iso-structural and always superconducting, we have measured the electron momentum density in these materials. We find that they differ in a striking way, the wavefunction coherence length in PrBa2Cu3O7-d being strongly suppressed. We conclude that Pr on Ba-site substitution disorder is responsible for the metal-insulator transition. Preliminary efforts at growth with a method to prevent disorder yield 90K superconducting PrBa2Cu3O7-d crystallites.
Source:	arXiv, cond-mat/9805225
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