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

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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.

Original languageEnglish
Article number226404
JournalPhysical Review Letters
Volume104
Issue number22
DOIs
Publication statusPublished - 2010 Jun 3
Externally publishedYes

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spin dynamics
magnets
photoelectric emission
insulators
ground state
energy
spectroscopy
excitation
ions

ASJC Scopus subject areas

  • Physics and Astronomy(all)

Cite this

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.

Research output: Contribution to journalArticle

Takubo, K, Nambu, Y, Nakatsuji, S, Wakisaka, Y, Sudayama, T, Fournier, D, Levy, G, Damascelli, A, Arita, M, Namatame, H, Taniguchi, M & Mizokawa, T 2010, 'Separation between low-energy hole dynamics and spin dynamics in a frustrated magnet', Physical Review Letters, vol. 104, no. 22, 226404. https://doi.org/10.1103/PhysRevLett.104.226404
Takubo K, Nambu Y, Nakatsuji S, Wakisaka Y, Sudayama T, Fournier D et al. Separation between low-energy hole dynamics and spin dynamics in a frustrated magnet. Physical Review Letters. 2010 Jun 3;104(22). 226404. https://doi.org/10.1103/PhysRevLett.104.226404
Takubo, Kou ; Nambu, Yusuke ; Nakatsuji, Satoru ; Wakisaka, Yuki ; Sudayama, Takaaki ; Fournier, David ; Levy, Giorgio ; Damascelli, Andrea ; Arita, Masashi ; Namatame, Hirofumi ; Taniguchi, Masaki ; Mizokawa, Takashi. / Separation between low-energy hole dynamics and spin dynamics in a frustrated magnet. In: Physical Review Letters. 2010 ; Vol. 104, No. 22.
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AU - Fournier, David

AU - Levy, Giorgio

AU - Damascelli, Andrea

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