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Updated: Sep 20, 2026

Methods of Ex Situ and In Situ Investigations of Structural Transformations: The Case of Crystallization of Metallic Glasses
Published on: June 7, 2018
Correlation of the local and the macroscopic properties of high-temperature superconductors: EXAFS data analysis
1Moscow Engineering Physics Institute (State University), Kashirskoe shosse 31, 115409 Moscow, Russia. menushen@htsc.mephi.ru
Abstract:
Based on temperature-dependent EXAFS studies of Ba(1-x)K(x)BiO(3) superconducting oxide, a model of the relationship between the local crystal and the local electronic structures has been proposed. Oxygen ions were found to vibrate in a double-well potential and their vibrations are correlated with the local electron pair transfer due to the dynamical exchange BiO(6) <--> BiL(2)O(6), where L(2) denotes the hole pair in the antibonding Bi 6s O2p(sigma*) orbital of the octahedral complex. The similarity of the EXAFS spectra features of Ba(1-x)K(x)BiO(3) and La(2-x)Sr(x)CuO(4) allowed us to propose a similar model for Cu-based superconducting oxides. The model, in a common approach, explains the antiferromagnetic state, metal-insulator phase transition and the appearance of superconductivity at Sr(2+) doping of La(2)CuO(4), and eliminates discrepancy between the neutron-scattering and EXAFS data.
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