title: Electric-field-induced metal maintained by current of the Mott insulator Ca2RuO4.
abstract: Recently, "application of electric field (E-field)" has received considerable attention as a new method to induce novel quantum phenomena since application of E-field can tune the electronic states directly with obvious scientific and industrial advantages over other turning methods. However, E-field-induced Mott transitions are rare and typically require high E-field and low temperature. Here we report that the multiband Mott insulator Ca2RuO4 shows unique insulator-metal switching induced by applying a dry-battery level voltage at room temperature. The threshold field Eth ~40 V/cm is much weaker than the Mott gap energy. Moreover, the switching is accompanied by a bulk structural transition. Perhaps the most peculiar of the present findings is that the induced metal can be maintained to low temperature by a weak current.
authors.affiliation: ADSM, Hiroshima University, Higashi-Hiroshima 739-8530, Japan.
authors.forename: Fumihiko
authors.initials: F
authors.lastname: Nakamura
authors.forename: Mariko
authors.initials: M
authors.lastname: Sakaki
authors.forename: Yuya
authors.initials: Y
authors.lastname: Yamanaka
authors.forename: Sho
authors.initials: S
authors.lastname: Tamaru
authors.forename: Takashi
authors.initials: T
authors.lastname: Suzuki
authors.forename: Yoshiteru
authors.initials: Y
authors.lastname: Maeno