Dresden 2009 – scientific programme

Parts | Days | Selection | Search | Downloads | Help

TT: Fachverband Tiefe Temperaturen

TT 5: Postersession Superconductivity: Materials - Fabrication and Properties

TT 5.17: Poster

Monday, March 23, 2009, 13:00–16:45, P1A

Superconductivity and magnetism in electrochemically doped oxides — •Andreia Ioana Popa¹, Hemke Maeter², Christine Täschner¹, Ingo Hellmann¹, Rüdiger Klingeler¹, Bernd Büchner¹, and Hans-Henning Klauß² — ¹Leibniz-Institute for Solid State and Materials Research IFW Dresden, Germany — ²IFP, TU Dresden, Germany

We study the magnetic and electronic properties of transition metal oxides in which the valency of the metal ions is modified electrochemically by Li intercalation/deintercalation. The electrochemical doping strongly affects the electronic and magnetic properties. One example is the evolution of superconductivity in the CuO₂ planes of Li_xSr₂CuO₂Br₂. Electron doping is realized by Li-intercalation and superconductivity is found below 9K. Electrochemical treatment hence allows studying the electronic phase diagram of this new electron doped cuprate superconductor. Another relevant class of materials under study are mixed valent vanadium-oxide multiwall nanotubes which represent a technologically relevant material for lithium-ion batteries. Upon electron doping of VO_x-NTs, our data confirm a higher number of magnetic V⁴⁺ sites. Interestingly, room temperature ferromagnetism evolves after electrochemical intercalation of Li making VO_x-NTs a novel type of self-assembled nanoscaled magnets.