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

^*この研究の対応する著者

研究成果: Article › 査読

6 被引用数 (Scopus)

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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月 3
外部発表	はい

ASJC Scopus subject areas

物理学および天文学（全般）

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10.1103/PhysRevLett.104.226404

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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.",

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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

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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.

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

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