Dresden 2009 – wissenschaftliches Programm
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TT: Fachverband Tiefe Temperaturen
TT 5: Postersession Superconductivity: Materials - Fabrication and Properties
TT 5.17: Poster
Montag, 23. März 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 LixSr2CuO2Br2. 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 VOx-NTs, our data confirm a higher number of magnetic V4+ sites. Interestingly, room temperature ferromagnetism evolves after electrochemical intercalation of Li making VOx-NTs a novel type of self-assembled nanoscaled magnets.