Anisotropic behavior in untwinned YBa2Cu4O8: Optical, magnetic and transport measurements at high pressure

✍ Scribed by B. Bucher; J. Karpinski; E. Kaldis; P. Wachter

• Publisher: Elsevier Science
• Year: 1990
• Tongue: English
• Weight: 1007 KB
• Volume: 167
• Category: Article
• ISSN: 0921-4534
• DOI: 10.1016/0921-4534(90)90350-n

✦ Synopsis

We have investigated the anisotropic propertles of untwinned, smgle crystal YBa2Cud0, in the directions ofthe U-and h-axes. .Along the h-direction, one has in addition to the plane a doubled CuO chain. Resistivity measurements (0-I5 kbar) have rehealed an anisotropy of a factor three. The transition temperature of one sample was different with respect to the aand b-dlrection.

Polarized microspot reflectivity spectra have shown a shift of the plasma edges of about 1 cV. The determination of lfCz( T) with H'"' perpendicular and parallel to the plane also has given a high anisotropq.

In the context of magnetic and elastic bound bipolarons which can suffer a Bose condensation some experimental facts can be understood.