Universal Behavior of Magnetoresistance in Organic Dirac Electron Systems

Ryotaro Kobara; Shin Igarashi; Yoshitaka Kawasugi; Ryusei Doi; Toshio Naito; Masafumi Tamura; Reizo Kato; Yutaka Nishio; Koji Kajita; Naoya Tajima

doi:10.7566/JPSJ.89.113703

Universal Behavior of Magnetoresistance in Organic Dirac Electron Systems

Strongly Correlated Electrons 2020-10-28 v1

Authors: Ryotaro Kobara , Shin Igarashi , Yoshitaka Kawasugi , Ryusei Doi , Toshio Naito , Masafumi Tamura , Reizo Kato , Yutaka Nishio , Koji Kajita , Naoya Tajima

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Abstract

In-plane magnetoresistance for organic massless Dirac electron system (OMDES) $\alpha$ -(BEDT-TTF) $_2$ I $_3$ and $\theta$ -(BEDT-TTF) $_2$ I $_3$ in addition to possible candidates of the OMDES $\alpha$ -(BETS) $_2$ I $_3$ and $\alpha$ -(BEDT-STF) $_2$ I $_3$ , was investigated under hydrostatic pressure. We have found the universal behavior of the in-plane magnetoresistance under a low magnetic field perpendicular to two-dimensional plane. As for $\alpha$ -(BEDT-TTF) $_2$ I $_3$ , the universality was examined with the parameters of temperature, magnetic field and its direction. We suggest that the universal magnetoresistance behavior is found even for the gapped state of $\alpha$ -(BEDT-TTF) $_2$ I $_3$ under intermediate pressure, when the thermal energy exceeds the gap.

Keywords

organic dirac electron systems magnetoresistance hydrostatic pressure universal behavior bedt-ttf salts two-dimensional plane

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@article{arxiv.2010.09160,
  title  = {Universal Behavior of Magnetoresistance in Organic Dirac Electron Systems},
  author = {Ryotaro Kobara and Shin Igarashi and Yoshitaka Kawasugi and Ryusei Doi and Toshio Naito and Masafumi Tamura and Reizo Kato and Yutaka Nishio and Koji Kajita and Naoya Tajima},
  journal= {arXiv preprint arXiv:2010.09160},
  year   = {2020}
}

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11 pages, 4 figures

Universal Behavior of Magnetoresistance in Organic Dirac Electron Systems

Abstract

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