Pressure-induced metallization in iron-based ladder compounds Ba 1-x Cs x Fe 2 Se 3

Takafumi Hawai, Chizuru Kawashima, Kenya Ohgushi, Kazuyuki Matsubayashi, Yusuke Nambu, Yoshiya Uwatoko, Taku J. Sato, Hiroki Takahashi

研究成果: Article

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Electrical resistivity measurements have been performed on the iron-based ladder compounds Ba 1-x Cs x Fe 2 Se 3 (x = 0, 0.25, 0.65, and 1) under high pressure. A cubic anvil press was used up to 8.0 GPa, whereas further higher pressure was applied using a diamond anvil cell up to 30.0 GPa. Metallic behavior of the electrical conductivity was confirmed in the x = 0.25 and 0.65 samples for pressures greater than 11.3 and 14.4 GPa, respectively, with the low-temperature log T upturn being consistent with weak localization of 2D electrons due to random potential. At pressures higher than 23.8 GPa, three-dimensional Fermi-liquid-like behavior was observed in the latter sample. No metallic conductivity was observed in the parent compounds BaFe 2 Se 3 (x = 0) up to 30.0 GPa and CsFe 2 Se 3 (x = 1) up to 17.0 GPa. The present results indicate that the origins of the insulating ground states in the parent and intermediate compounds are intrinsically different; the former is a Mott insulator, whereas the latter is an Anderson insulator owing to the random substitution of Cs for Ba.

ジャーナルjournal of the physical society of japan
出版物ステータスPublished - 2017 1 1

ASJC Scopus subject areas

  • Physics and Astronomy(all)

フィンガープリント Pressure-induced metallization in iron-based ladder compounds Ba <sub>1-x</sub> Cs <sub>x</sub> Fe <sub>2</sub> Se <sub>3</sub>' の研究トピックを掘り下げます。これらはともに一意のフィンガープリントを構成します。

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