Orbital-selective metal- insulator transition lifting the t2g band hybridization in the Hund metal Sr3(Ru1-xMnx)2O7

被引：4

作者：

Nakayama, M. ^{[1
]}

Kondo, Takeshi ^{[1
]}

Kuroda, K. ^{[1
]}

Bareille, C. ^{[1
]}

Watson, M. D. ^{[2
]}

Kunisada, S. ^{[1
]}

Noguchi, R. ^{[1
]}

Kim, T. K. ^{[2
]}

Hoesch, M. ^{[2
,3
]}

Yoshida, Y. ^{[4
]}

Shin, S. ^{[1
]}

机构：

[1] Univ Tokyo, ISSP, Kashiwa, Chiba 2778581, Japan

[2] Diamond Light Source, Harwell Campus, Didcot OX11 0DE, Oxon, England

[3] DESY, DESY Photon Sci, Notkestr 85, D-22607 Hamburg, Germany

[4] Natl Inst Adv Ind Sci & Technol, Elect & Photon Res Inst, Tsukuba, Ibaraki 3058568, Japan

来源：

PHYSICAL REVIEW B | 2018年 / 98卷 / 16期

关键词：

SR2RUO4;

D O I：

10.1103/PhysRevB.98.161102

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

We reveal the orbital-selective metal-insulator transition in a 4d multiorbital system, Sr-3(Ru1-xMnx)(2)O-7 (x = 0-0.2), by means of angle-resolved photoemission spectroscopy. With a small substitution (x = 0.05) of Mn with localized 3d orbitals, the spectra for the 4d(xy) band become incoherent with a large gap, while the 4d(xz/yz) bands stay metallic with sharp quasiparticle peaks. Intriguingly, this lifts band hybridization among 4d orbitals, and causes a two-to one-dimensional crossover in the remaining Fermi surface. Significant nesting in the remaining Fermi surface is implied to induce the reported magnetic ordering, and yields the insulating bulk state at higher Mn substitution, where all bands are gapped and totally incoherent. The availability of orbital-selective tuning of the pseudogap by a small impurity will prompt further theoretical studies of Hund's metals, which were recognized only recently in condensed matter physics.

引用

页数：5

共 34 条

[1] Nested Fermi surface and electronic instability in Ca3Ru2O7 [J].