Competing Ground States of Metal–Halide Ladders

Funase, Kei-ichi; Yamamoto, Shoji

doi:10.1143/jpsj.75.044717

Cited by 13 publications

(16 citation statements)

References 51 publications

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“…SrCu 2 O 3 behaves as a d-p ladder of the Hubbard type, 29 whereas NaV 2 O 5 is well describable within a single-band HolsteinHubbard Hamiltonian. 30 On the other hand, the newly synthesized metal-halide ladders are double featured with competing electron-electron and electron-phonon interactions 31 and are possibly of d-p--mixed character. Such a multicolored stage potentially exhibits a variety of electronic states, and it is highly interesting to control them chemically and physically.…”

Section: Introductionmentioning

confidence: 99%

Optical characterization of platinum-halide ladder compounds

Yamamoto

Ohara

2007

Phys. Rev. B

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Varieties of quasi-one-dimensional halogen ͑X͒-bridged transition-metal ͑M͒ complexes, ͑C 8 H 6 N 4 ͒ ϫ͓Pt͑C 2 H 8 N 2 ͒X͔ 2 X͑ClO 4 ͒ 3 ·H 2 O ͑X =Br,Cl͒ and ͑C 10 H 8 N 2 ͓͒Pt͑C 4 H 13 N 3 ͒Br͔ 2 Br 4 ·2H 2 O, comprising two-leg ladders of mixed-valent platinum ions, are described in terms of a multiband extended Peierls-Hubbard Hamiltonian. The polarized optical-conductivity spectra are theoretically reproduced, and the ground-state valence distributions are reasonably determined. The latter variety, whose interchain valence arrangement is out of phase, is reminiscent of conventional MX single-chain compounds, while the former variety, whose interchain valence arrangement is in phase, reveals itself as a d-p--hybridized multiband ladder material.

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Section: Introductionmentioning

confidence: 99%

Optical characterization of platinum-halide ladder compounds

Yamamoto

Ohara

2007

Phys. Rev. B

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“…They are made in similar ladder structures but in distinct ground states of mixed valence, 36,37 which are optically distinguishable.…”

Section: 33mentioning

confidence: 99%

Ground-State Properties of a Peierls–Hubbard Triangular Prism

Yamamoto¹,

Ohara²,

Ozaki³

2010

J. Phys. Soc. Jpn.

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Motivated by recent chemical attempts at assembling halogen-bridged transition-metal complexes within a nanotube, we model and characterize a platinum-halide triangular prism in terms of a Peierls-Hubbard Hamiltonian. Based on a group-theoretical argument, we reveal a variety of valence arrangements, including heterogeneous or partially metallic charge-density-wave states. Quantum and thermal phase competitions are numerically demonstrated with particular emphasis on novel insulator-to-metal and insulator-to-insulator transitions under doping, the former of which is of the first order, while the latter of which is of the second order.

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“…Besides Pt 2 X chains, ladder-shaped PtX complexes have been recently synthesized, 59,60 exhibiting ground-state variations. 61,62,63 We hope our calculations will stimulate extensive optical explorations of new varieties of metalhalide complexes.…”

Section: )mentioning

confidence: 99%

Photoproduction of spin and charge carriers in halogen-bridged binuclear platinum chain complexes

Yamamoto¹,

Ohara²

2008

J. Phys.: Condens. Matter

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Nonlinear lattice relaxation of photoexcited diplatinum-halide chain compounds is theoretically investigated within a one-dimensional extended Peierls-Hubbard model. We first illuminate the whole relaxation scenario in terms of variational wave functions and then visualize each relaxation channel numerically integrating the Schrödinger equation. High-energy excitations above the electron-hole continuum tend to relax into polarons, while excitons pumped within the optical gap, unless luminescent, turn into solitonic states nonradiatively. Neutral and charged solitons coexist as stable photoproducts, which has never been observed in conventional platinum-halide chains, and they are highly resonant on the occasion of their birth and geminate recombination.

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Competing Ground States of Metal–Halide Ladders

Cited by 13 publications

References 51 publications

Optical characterization of platinum-halide ladder compounds

Optical characterization of platinum-halide ladder compounds

Ground-State Properties of a Peierls–Hubbard Triangular Prism

Photoproduction of spin and charge carriers in halogen-bridged binuclear platinum chain complexes

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