Observation of a pseudogap in the vicinity of the metal–insulator transition in the perovskite-type vanadium oxides Nd1−xSrxVO3

Shintaro Yamamoto, Daiki Ootsuki, Daiya Shimonaka, Daisuke Shibata, Kenjiro Kodera, Mario Okawa, Tomohiko Saitoh, Masafumi Horio, Atsushi Fujimori, Hiroshi Kumigashira, Kanta Ono, Eiji Ikenaga, Shigeki Miyasaka, Setsuko Tajima, Teppei Yoshida

Research output: Contribution to journalArticlepeer-review

1 Citation (Scopus)

Abstract

We have performed a photoemission study of the Mott–Hubbard system Nd1xSrxVO3 (x = 0.20 and 0.30) to investigate the electronic structure in the vicinity of the metal–insulator transition. By using bulk sensitive hard X-ray photoemission spectroscopy, we have observed a large coherent spectral weight near the Fermi level compared to those observed with surface-sensitive low photons. In particular, a pseudogap with an energy of ~0.2 eV has been observed near the Fermi level, which is consistent with a prediction with a dynamical cluster approximation calculation. In order to understand the characteristic features in the Mott–Hubbard-type metal–insulator transition, particularly the pseudogap opening at x = 0.2 and 0.3, a phenomenological model of the self-energy has been proposed.

Original languageEnglish
Article number024708
Journaljournal of the physical society of japan
Volume87
Issue number2
DOIs
Publication statusPublished - 2018
Externally publishedYes

ASJC Scopus subject areas

  • Physics and Astronomy(all)

Fingerprint

Dive into the research topics of 'Observation of a pseudogap in the vicinity of the metal–insulator transition in the perovskite-type vanadium oxides Nd<sub>1−x</sub>Sr<sub>x</sub>VO<sub>3</sub>'. Together they form a unique fingerprint.

Cite this