Separation between low-energy hole dynamics and spin dynamics in a frustrated magnet

Kou Takubo; Yusuke Nambu; Satoru Nakatsuji; Yuki Wakisaka; Takaaki Sudayama; David Fournier; Giorgio Levy; Andrea Damascelli; Masashi Arita; Hirofumi Namatame; Masaki Taniguchi; Takashi Mizokawa

doi:10.1103/PhysRevLett.104.226404

Separation between low-energy hole dynamics and spin dynamics in a frustrated magnet

Kou Takubo, Yusuke Nambu, Satoru Nakatsuji, Yuki Wakisaka, Takaaki Sudayama, David Fournier, Giorgio Levy, Andrea Damascelli, Masashi Arita, Hirofumi Namatame, Masaki Taniguchi, Takashi Mizokawa

研究成果: Article › 査読

6 被引用数 (Scopus)

抄録

An angle-resolved photoemission spectroscopy (ARPES) study is reported on a Mott insulator NiGa2S4 in which Ni2⁺ (S=1) ions form a triangular lattice and the Ni spins do not order even in its ground state. The first ARPES study on the two-dimensional spin-disordered system shows that low-energy hole dynamics at high temperatures is characterized by wave vectors QE which are different from wave vectors QM dominating low-energy spin excitations at low temperatures. The unexpected difference between QE and QM is deeply related to charge fluctuation across the Mott gap in the frustrated lattice and is a key issue to understand the spin-disordered ground states in Mott insulators.

本文言語	English
論文番号	226404
ジャーナル	Physical Review Letters
巻	104
号	22
DOI	https://doi.org/10.1103/PhysRevLett.104.226404
出版ステータス	Published - 2010 6 3
外部発表	はい

ASJC Scopus subject areas

Physics and Astronomy(all)

文献へのアクセス

10.1103/PhysRevLett.104.226404

他のファイルとリンク

フィンガープリント「Separation between low-energy hole dynamics and spin dynamics in a frustrated magnet」の研究トピックを掘り下げます。これらがまとまってユニークなフィンガープリントを構成します。

引用スタイル

Separation between low-energy hole dynamics and spin dynamics in a frustrated magnet. / Takubo, Kou; Nambu, Yusuke; Nakatsuji, Satoru; Wakisaka, Yuki; Sudayama, Takaaki; Fournier, David; Levy, Giorgio; Damascelli, Andrea; Arita, Masashi; Namatame, Hirofumi; Taniguchi, Masaki; Mizokawa, Takashi.

In: Physical Review Letters, Vol. 104, No. 22, 226404, 03.06.2010.

研究成果: Article › 査読

@article{414ea07007e24ac0a506cb7d8d9f2fa8,

title = "Separation between low-energy hole dynamics and spin dynamics in a frustrated magnet",

abstract = "An angle-resolved photoemission spectroscopy (ARPES) study is reported on a Mott insulator NiGa2S4 in which Ni2+ (S=1) ions form a triangular lattice and the Ni spins do not order even in its ground state. The first ARPES study on the two-dimensional spin-disordered system shows that low-energy hole dynamics at high temperatures is characterized by wave vectors QE which are different from wave vectors QM dominating low-energy spin excitations at low temperatures. The unexpected difference between QE and QM is deeply related to charge fluctuation across the Mott gap in the frustrated lattice and is a key issue to understand the spin-disordered ground states in Mott insulators.",

author = "Kou Takubo and Yusuke Nambu and Satoru Nakatsuji and Yuki Wakisaka and Takaaki Sudayama and David Fournier and Giorgio Levy and Andrea Damascelli and Masashi Arita and Hirofumi Namatame and Masaki Taniguchi and Takashi Mizokawa",

year = "2010",

month = jun,

day = "3",

doi = "10.1103/PhysRevLett.104.226404",

language = "English",

volume = "104",

journal = "Physical Review Letters",

issn = "0031-9007",

publisher = "American Physical Society",

number = "22",

}

TY - JOUR

T1 - Separation between low-energy hole dynamics and spin dynamics in a frustrated magnet

AU - Takubo, Kou

AU - Nambu, Yusuke

AU - Nakatsuji, Satoru

AU - Wakisaka, Yuki

AU - Sudayama, Takaaki

AU - Fournier, David

AU - Levy, Giorgio

AU - Damascelli, Andrea

AU - Arita, Masashi

AU - Namatame, Hirofumi

AU - Taniguchi, Masaki

AU - Mizokawa, Takashi

PY - 2010/6/3

Y1 - 2010/6/3

N2 - An angle-resolved photoemission spectroscopy (ARPES) study is reported on a Mott insulator NiGa2S4 in which Ni2+ (S=1) ions form a triangular lattice and the Ni spins do not order even in its ground state. The first ARPES study on the two-dimensional spin-disordered system shows that low-energy hole dynamics at high temperatures is characterized by wave vectors QE which are different from wave vectors QM dominating low-energy spin excitations at low temperatures. The unexpected difference between QE and QM is deeply related to charge fluctuation across the Mott gap in the frustrated lattice and is a key issue to understand the spin-disordered ground states in Mott insulators.

AB - An angle-resolved photoemission spectroscopy (ARPES) study is reported on a Mott insulator NiGa2S4 in which Ni2+ (S=1) ions form a triangular lattice and the Ni spins do not order even in its ground state. The first ARPES study on the two-dimensional spin-disordered system shows that low-energy hole dynamics at high temperatures is characterized by wave vectors QE which are different from wave vectors QM dominating low-energy spin excitations at low temperatures. The unexpected difference between QE and QM is deeply related to charge fluctuation across the Mott gap in the frustrated lattice and is a key issue to understand the spin-disordered ground states in Mott insulators.

UR - http://www.scopus.com/inward/record.url?scp=77953173442&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=77953173442&partnerID=8YFLogxK

U2 - 10.1103/PhysRevLett.104.226404

DO - 10.1103/PhysRevLett.104.226404

M3 - Article

AN - SCOPUS:77953173442

VL - 104

JO - Physical Review Letters

JF - Physical Review Letters

SN - 0031-9007

IS - 22

M1 - 226404

ER -