Anisotropic low-temperature magnetoresistivity in the normal state of L2−xCexCuO4 single crystals

✍ Scribed by M.A Crusellas; J Fontcuberta; S Piñol

• Publisher: Elsevier Science
• Year: 1994
• Tongue: English
• Weight: 664 KB
• Volume: 226
• Category: Article
• ISSN: 0921-4534
• DOI: 10.1016/0921-4534(94)90210-0

✦ Synopsis

We report in-plane pab(T, H) and c-axis pc(T, H) electrical magnetoresistivity measurements on several L2_xCexCuO4 (L= Pr, Sm, Nd) superconducting single crystals. It is found that in the normal state both resistivities Pat, (T) and Pc(T) display a minimum at certain temperatures '~ Tmi. and TCi. which separates regions of metallic behavior at T> Tmi, from semiconducting-like behavior at T< Train. In the low-temperature region ( T< T~a~), Pab(T) has a logarithmic temperature dependence p~b~ -In T and negative magnetoresistivity which are argued to be due to 2D localization effects. In contrast, at low temperatures, Pc(T) can be described in terms of a hopping conductivity.