Metal-insulator transition in Ba3-xSrxNb5 O15

Yuhki Kondoh, Ryosuke Takei, Tetsuji Okuda, Kazunori Ueno, Yumiko Katayama, Takuo Saiki, Wataru Sekino, Tomomasa Kajita, Takuro Katsufuji

Research output: Contribution to journalArticlepeer-review

Abstract

We investigated single crystals of Ba3-xSrxNb5O15 with a tetragonal tungsten bronze (TTB) structure, which exhibits a metal-insulator transition with x. We found that there is a one-dimensional anisotropy with a higher dc conductivity along the c axis in the metallic phase, but it disappears in the insulating phase. The optical conductivity spectra of the metallic samples show similar anisotropy to the dc conductivity, but the anisotropy persists even in the insulating phase. These experimental results, together with the result of magnetic susceptibility, indicate that the disorder caused by the Sr ions loosely bound to the surrounding oxygen ions plays an important role in the metal-insulator transition.

Original languageEnglish
Article number125128
JournalPhysical Review B
Volume104
Issue number12
DOIs
Publication statusPublished - 2021 Sep 15

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics

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