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KFM: Fachverband Kristalline Festkörper und deren Mikrostruktur

KFM 15: Postersession KFM

KFM 15.20: Poster

Donnerstag, 19. März 2020, 16:00–18:30, P2/1OG

Current induced insulator-metal transition in Ca₂RuO₄ — •Konstantin Dietrich, Christoph Grams, Kevin Jenni, Markus Braden, and Joachim Hemberger — II. Physikalisches Institut, Universität zu Köln, Germany

Ca₂RuO₄ is a Mott insulator with a first order metal insulator transition at a critical temperature of T_C=357K [1]. The change in conducting behavior is accompanied by a change in crystal structure of the layered ruthenate. The conducting phase above T_C has an elongated c-axis (c=12.26Å) compared to the non-conducting phase (c=11.77Å) below T_C [2].

This phase transition can not only be induced by a change in temperature but also by application of an electrical field [3]. At temperatures below 50K the application of small currents can even induce very strong diamagnetic behavior [4].

Using pulsed spectroscopy, we investigate the dynamics of this field-induced switching process. We are able to discriminate heating effects by separating the time-scales for temperature and field induced transitioning and we can identify the signatures of inner contacts due to the coexistence of metallic and insulating phases.

[1] C. S. Alexander et al., Phys. Rev. B 60, 12 (1999)
[2] O. Friedt et al., Phys. Rev. B 63, 174432 (2001)
[3] F. Nakamura et al., Sci. Rep. 3, (2013)
[4] C. Sow et al., Science 358, 1084 (2017)