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Dresden 2020 – wissenschaftliches Programm

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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 TC=357K [1]. The change in conducting behavior is accompanied by a change in crystal structure of the layered ruthenate. The conducting phase above TC has an elongated c-axis (c=12.26Å) compared to the non-conducting phase (c=11.77Å) below TC [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.

Funded by the Deutsche Forschungsgemeinschaft via CRC 1238.

[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)

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