A μSR Study of Current-Induced Destruction of Order in 1% Ti Doped Ca2RuO4

Abstract

Due to its electrically activated phase transition from an insulator to a metal, Mott insulator Ca2RuO4 is a material with great potential in researching phase transitions and application of bolometric devices. Although pure Ca2RuO4 is very unstable and thus difficult to obtain in bulk, single-crystal form, a 1% doping of Ti for Ru stabilizes the material with minimal influence on its magnetic and electrical properties. This thesis uses μSR techniques to look at a single crystal of 1% Ti doped Ca2RuO4 under current in order to investigate the magnetic ordering of the material in its metallic state. From this we determine that Ca2RuO4 undergoes a destruction of long-range order when under sufficient current to induce its metallic state if one assumes adequate cooling power of the cryostat. In order to confirm the cooling power of the cryostat used, analyses on the Joule heating from the sample was performed, yielding mixed results, causing the question of whether this data was collected below the currentless ordering temperature of Ca2RuO4 to go unanswered.