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

doi:10.1103/PhysRevB.104.125128

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

School of Advanced Science and Engineering

Research output: Contribution to journal › Article › peer-review

3 Citations (Scopus)

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 language	English
Article number	125128
Journal	Physical Review B
Volume	104
Issue number	12
DOIs	https://doi.org/10.1103/PhysRevB.104.125128
Publication status	Published - 2021 Sept 15

ASJC Scopus subject areas

Electronic, Optical and Magnetic Materials
Condensed Matter Physics

Access to Document

10.1103/PhysRevB.104.125128

Cite this

@article{05468ea3784c4003bcd6af9a9c08e2f2,

title = "Metal-insulator transition in Ba3-xSrxNb5 O15",

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.",

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

note = "Funding Information: We thank T. Mizokawa, T. Yasuda, and N. L. Saini for fruitful discussions. This work was supported by JSPS KAKENHI Grants No. 19H01853, No. 21H01038, and JST CREST Grant No. JPMJCR15Q2. Publisher Copyright: {\textcopyright} 2021 American Physical Society.",

year = "2021",

month = sep,

day = "15",

doi = "10.1103/PhysRevB.104.125128",

language = "English",

volume = "104",

journal = "Physical Review B",

issn = "2469-9950",

publisher = "American Physical Society",

number = "12",

}

TY - JOUR

T1 - Metal-insulator transition in Ba3-xSrxNb5 O15

AU - Kondoh, Yuhki

AU - Takei, Ryosuke

AU - Okuda, Tetsuji

AU - Ueno, Kazunori

AU - Katayama, Yumiko

AU - Saiki, Takuo

AU - Sekino, Wataru

AU - Kajita, Tomomasa

AU - Katsufuji, Takuro

N1 - Funding Information: We thank T. Mizokawa, T. Yasuda, and N. L. Saini for fruitful discussions. This work was supported by JSPS KAKENHI Grants No. 19H01853, No. 21H01038, and JST CREST Grant No. JPMJCR15Q2. Publisher Copyright: © 2021 American Physical Society.

PY - 2021/9/15

Y1 - 2021/9/15

N2 - 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.

AB - 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.

UR - http://www.scopus.com/inward/record.url?scp=85115745015&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=85115745015&partnerID=8YFLogxK

U2 - 10.1103/PhysRevB.104.125128

DO - 10.1103/PhysRevB.104.125128

M3 - Article

AN - SCOPUS:85115745015

SN - 2469-9950

VL - 104

JO - Physical Review B

JF - Physical Review B

IS - 12

M1 - 125128

ER -

Metal-insulator transition in Ba3-xSrxNb5 O15

Abstract

ASJC Scopus subject areas

Access to Document

Other files and links

Fingerprint

Cite this