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

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Abstract

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.

Original languageEnglish
Article number024701
Journaljournal of the physical society of japan
Volume86
Issue number2
DOIs
Publication statusPublished - 2017 Jan 1

ASJC Scopus subject areas

  • Physics and Astronomy(all)

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