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Electrochemical intercalation of O2− in La2CuO4 single crystals

✍ Scribed by R.D. Sanchez; R.M. Torresi; C. Rettori; S. Oseroff; Z. Fisk

Publisher
Elsevier Science
Year
1995
Tongue
English
Weight
413 KB
Volume
40
Category
Article
ISSN
0013-4686

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✦ Synopsis

The electrochemical intercalation of oxygen in La,CuO, single crystals was studied using electron paramagnetic resonance and magnetic susceptibility measurements. Chronoamperometric experiments showed that, in the intercalation process, the 0 2-diffusion in single crystals is extremely slow (D z lo-r6 cmrs-'). This diffusion coefficient depends strongly on temperature and the enthalpy diffusion was found to be ca. 750 kJ deg-' mol-i. Crystals under electro-oxidation for one to two weeks still show the presence of the antiferromagnetic and a superconducting phases. This was supported by the simultaneous observation of line splitting in the EPR spectra and superconducting diamagnetic signal.

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