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

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

6 Citations (Scopus)

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.

Original language	English
Article number	226404
Journal	Physical review letters
Volume	104
Issue number	22
DOIs	https://doi.org/10.1103/PhysRevLett.104.226404
Publication status	Published - 2010 Jun 3
Externally published	Yes

ASJC Scopus subject areas

Physics and Astronomy(all)

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10.1103/PhysRevLett.104.226404

Cite this

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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

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.

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

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