Challenges
Datasets
Workspaces
Papers
Discussions
Leaderboard
Log inSign up
Challenges
Datasets
Workspaces
Papers
Discussions
Leaderboard
Blog
Job Board
Q3AS

© 2026 Aqora Quantum S.A.S.

TermsPrivacyLegal Notice

Journal of the Physical Society of Japan

Single-Length-Scaling Analysis for Antiferromagnetic Fractons in Dilute Heisenberg System RbMn0.4Mg0.6F3

Shinichi Itoh, Tsuneyoshi Nakayama, Ryoichi Kajimoto, Mark A. Adams

Published Dec 25, 2008• 3 citations
Publisher

Abstract

The dynamic structure factors S ( q ,ω) of an ideal percolating network, the three-dimensional (3 d ) dilute Heisenberg antiferromagnet RbMn 0.4 Mg 0.6 F 3 , obtained from high resoluton (Δ E = 17.5 µeV) inelastic neutron scattering (INS) experiments are analyzed for the first time within the framework of the single-length-scaling postulate (SLSP). The analysis confirms the validity of the SLSP and is also used to extract the values of the key exponents governing the spin dynamics, the dynamic exponent (\(z_{\text{AF}} = D_{\text{f}}/\tilde{d}_{\text{AF}}\)) being 2.5 ±0.1 and the spectral dimension \(\tilde{d}_{\text{AF}}\) for antiferromagnetic (AFM) fractons taking a value of unity.

DOI
10.1143/jpsj.78.013707

Related papers

Antiferromagnetic Fractons in Diluted Heisenberg Systems RbMn0.4Mg0.6F3 and Rb2Mn0.598Mg0.402F4

Shinichi Itoh, Tsuneyoshi Nakayama, Mark A. Adams

The dynamical structure factors, S ( q ,ω), for antiferromagnetic fractons in diluted three-dimensional (3D) and two-dimensional (2D) Heisenberg systems, RbMn 0.4 Mg 0.6 F 3 and Rb 2 Mn 0.598 Mg 0.402 F 4 , respectively, with a magnetic concentration close to the percolation concentration, were observed through high-resolution (Δ E = 17.5 µeV) inelastic neutron scattering experiments well below T N . The exponents describing the peak intensity ( A ( q ) ∝ q - y ) and the dispersion relation ( E ( q ) ∝ q z ) were determined to be y = 2.9 ±0.1 and z = 2.5 ±0.1 for the 3D system and y = 2.9 ±0.2 and z = 1.8 ±0.2 for the 2D system, respectively. In addition, the validity of the single-length-scaling postulate (SLSP) was confirmed for S ( q ,ω) by using the above values of y and z . We experimentally demonstrated, for the first time, that the spectral dimension, \(\tilde{d}_{\text{AF}} = 1\), is universal and independent of the embedding Euclidean dimensions of the systems.

Journal of the Physical Society of Japan•Sep 9, 2011•5 citations

Antiferromagnetic Fractons in Percolating Magnets

Shinichi Itoh, Tsuneyoshi Nakayama

We report the observations of the dynamical structure factors S(q,ω) for antifferomagnetic fractons in diluted three-dimensional (3d) and two-dimensional (2d) Heisenberg systems, RbMn0.4Mg0.6F3 and Rb2Mn0.598Mg0.402F4, with a magnetic concentration close to the percolation concentration, which were obtained by means of high-resolution (ΔE = 17.5 μeV) inelastic neutron scattering experiments. The peak intensity A(q) and the dispersion relation E(q) show the clear scaling laws following to A(q) ∝ q−y with y = 2.9 ± 0.1 and E(q) ∝ qz with z = 2.5 ± 0.1 for the 3d system, and y = 2.9 ± 0.2 and z = 1.8 ± 0.2 for the 2d system. The validity of the single-length-scaling postulate (SLSP) for S(q,ω) are demonstrated, for the first time. In addition, we show that the spectral dimension of antiferromagnetic fractons is unity independent of the embedding Euclidean dimension of the systems. These values are consistent with the theoretical predictions.

hamon•Jan 1, 2011•0 citations

Two-Dimensional Antiferromagnetic Fractons in Rb2Mn0.598Mg0.402F4

Shinichi Itoh, Tsuneyoshi Nakayama, Mark A. Adams

The dynamical structure factor S ( q,w ) for diluted two-dimensional Heisenberg antiferromagnet Rb 2 Mn 0.598 Mg 0.402 F 4 was investigated by means of high resolution (Δ E = 17.5μeV) inelastic neutron scattering below T N . The dynamical exponents in the peak intensity ( A ( q ) ∝ q − y ) and the dispersion relation ( E ( q ) ∝ q z ) for antiferromagnetic fractons were determined as y = 2.9±0.2 and z = 1.8±0.2, in good agreement with the numerical study. Also, the validity of the scaling based on the single-length-scaling postulate (SLSP) was confirmed.

Journal of Physics Conference Series•Dec 17, 2012•0 citations

Spin-wave Dynamics of Percolating Heisenberg Antiferromagnets

Kousuke Yakubo, Takamichi Terao, Tsuneyoshi Nakayama

The fracton dynamics of percolating Heisenberg antiferromagnets are studied in terms of a dynamic scaling argument and large-scale numerical analysis. It is shown that the spectral (or fracton) dimension for antiferromagnetic fractons, \(\tilde{d}_{\rm AF}\), is bounded by the relation \(\tilde{d}_{\rm AF}\le 1\). The densities of states (DOS) are calculated for very large percolating antiferromagnets at the critical concentration p c formed on d =2, 3, and 4 simple cubic lattices. It is concluded, from the calculated DOS's, that the spectral dimensions \(\tilde{d}_{\rm AF}\) are very close to unity for any Euclidean dimension d (≥2). We have also calculated the DOS for percolating antiferromagnets above p c in order to clarify the crossover behavior from extended magnons to fractons. In addition, the dynamical structure factor S ( q ,ω) is investigated both analytically and numerically. It is found, postulating a single-length scaling, that the asymptotic behaviors can be characterized by two exponents, the dynamical exponent z AF and a new exponent y . The numerical results for S ( q ,ω) support the validity of the single-length-scale postulate.

Journal of the Physical Society of Japan•Sep 15, 1994•11 citations

Scaling properties of the dynamical structure factor of percolating Heisenberg antiferromagnets

Takamichi Terao, Kousuke Yakubo, Tsuneyoshi Nakayama

The scaling behavior of the dynamical structure factor S(q,\ensuremath{\omega}) of percolating Heisenberg antiferromagnets is investigated in terms of a dynamic scaling argument and numerical calculations. It is found, based on the single-length-scaling postulate, that the asymptotic behavior of S(q,\ensuremath{\omega}) can be characterized by only two exponents: the dynamic exponent ${\mathit{z}}_{\mathit{a}}$ and a new exponent y. This theoretical prediction is confirmed by direct numerical calculations. The values of the exponents ${\mathit{z}}_{\mathit{a}}$ and y are determined for the case of d=2 percolating Heisenberg antiferromagnets.

Physical review. B, Condensed matter•May 1, 1994•7 citations

Localization properties of fractons in percolating structures

Colin John Lambert, G D Hughes

Scaling curves for the density of states and localization length of fractons near a percolation threshold are obtained for dilute and superconducting lattices in both two and three dimensions. These are used to verify the predictions of single-parameter scaling and to show that the energy dependence of the inverse localization length is consistent with known values of the spectral dimensionalities of these structures. The results demonstrate that eigenstates of an infinite, percolating, dilute structure exhibit superlocalization of the form \ensuremath{\psi}(r)\ensuremath{\sim}${\mathit{e}}^{\mathrm{\ensuremath{-}}\mathrm{\ensuremath{\beta}}\mathit{r}\mathrm{\ensuremath{\delta}}}$ with values of \ensuremath{\delta}=1.13\ifmmode\pm\else\textpm\fi{}0.06 and 1.39\ifmmode\pm\else\textpm\fi{}0.07 in two and three dimensions, respectively.

Physical Review Letters•Feb 25, 1991•31 citations
The dynamic structure factors S ( q ,ω) of an ideal percolating network, the three-dimensional (3 d ) dilute Heisenberg antiferromagnet RbMn 0.4 Mg 0.6 F 3 , obtained from high resoluton (Δ E = 17.5 µeV) inelastic neutron scattering (INS) experiments are analyzed for the first time within the framework of the single-length-scaling postulate (SLSP). The analysis confirms the validity of the SLSP and is also used to extract the values of the key exponents governing the spin dynamics, the dynamic exponent ((z_{\text{AF}} = D_{\text{f}}/\tilde{d}{\text{AF}})) being 2.5 ±0.1 and the spectral dimension (\tilde{d}{\text{AF}}) for antiferromagnetic (AFM) fractons taking a value of unity.
The dynamical structure factors, S ( q ,ω), for antiferromagnetic fractons in diluted three-dimensional (3D) and two-dimensional (2D) Heisenberg systems, RbMn 0.4 Mg 0.6 F 3 and Rb 2 Mn 0.598 Mg 0.402 F 4 , respectively, with a magnetic concentration close to the percolation concentration, were observed through high-resolution (Δ E = 17.5 µeV) inelastic neutron scattering experiments well below T N . The exponents describing the peak intensity ( A ( q ) ∝ q - y ) and the dispersion relation ( E ( q ) ∝ q z ) were determined to be y = 2.9 ±0.1 and z = 2.5 ±0.1 for the 3D system and y = 2.9 ±0.2 and z = 1.8 ±0.2 for the 2D system, respectively. In addition, the validity of the single-length-scaling postulate (SLSP) was confirmed for S ( q ,ω) by using the above values of y and z . We experimentally demonstrated, for the first time, that the spectral dimension, d~AF=1\tilde{d}_{\text{AF}} = 1d~AF​=1, is universal and independent of the embedding Euclidean dimensions of the systems.
We report the observations of the dynamical structure factors S(q,ω) for antifferomagnetic fractons in diluted three-dimensional (3d) and two-dimensional (2d) Heisenberg systems, RbMn0.4Mg0.6F3 and Rb2Mn0.598Mg0.402F4, with a magnetic concentration close to the percolation concentration, which were obtained by means of high-resolution (ΔE = 17.5 μeV) inelastic neutron scattering experiments. The peak intensity A(q) and the dispersion relation E(q) show the clear scaling laws following to A(q) ∝ q−y with y = 2.9 ± 0.1 and E(q) ∝ qz with z = 2.5 ± 0.1 for the 3d system, and y = 2.9 ± 0.2 and z = 1.8 ± 0.2 for the 2d system. The validity of the single-length-scaling postulate (SLSP) for S(q,ω) are demonstrated, for the first time. In addition, we show that the spectral dimension of antiferromagnetic fractons is unity independent of the embedding Euclidean dimension of the systems. These values are consistent with the theoretical predictions.
The dynamical structure factor S ( q,w ) for diluted two-dimensional Heisenberg antiferromagnet Rb 2 Mn 0.598 Mg 0.402 F 4 was investigated by means of high resolution (Δ E = 17.5μeV) inelastic neutron scattering below T N . The dynamical exponents in the peak intensity ( A ( q ) ∝ q − y ) and the dispersion relation ( E ( q ) ∝ q z ) for antiferromagnetic fractons were determined as y = 2.9±0.2 and z = 1.8±0.2, in good agreement with the numerical study. Also, the validity of the scaling based on the single-length-scaling postulate (SLSP) was confirmed.
The fracton dynamics of percolating Heisenberg antiferromagnets are studied in terms of a dynamic scaling argument and large-scale numerical analysis. It is shown that the spectral (or fracton) dimension for antiferromagnetic fractons, d~AF\tilde{d}_{\rm AF}d~AF​, is bounded by the relation d~AF≤1\tilde{d}_{\rm AF}\le 1d~AF​≤1. The densities of states (DOS) are calculated for very large percolating antiferromagnets at the critical concentration p c formed on d =2, 3, and 4 simple cubic lattices. It is concluded, from the calculated DOS's, that the spectral dimensions d~AF\tilde{d}_{\rm AF}d~AF​ are very close to unity for any Euclidean dimension d (≥2). We have also calculated the DOS for percolating antiferromagnets above p c in order to clarify the crossover behavior from extended magnons to fractons. In addition, the dynamical structure factor S ( q ,ω) is investigated both analytically and numerically. It is found, postulating a single-length scaling, that the asymptotic behaviors can be characterized by two exponents, the dynamical exponent z AF and a new exponent y . The numerical results for S ( q ,ω) support the validity of the single-length-scale postulate.
The scaling behavior of the dynamical structure factor S(q,\ensuremath{\omega}) of percolating Heisenberg antiferromagnets is investigated in terms of a dynamic scaling argument and numerical calculations. It is found, based on the single-length-scaling postulate, that the asymptotic behavior of S(q,\ensuremath{\omega}) can be characterized by only two exponents: the dynamic exponent za{\mathit{z}}_{\mathit{a}}za​ and a new exponent y. This theoretical prediction is confirmed by direct numerical calculations. The values of the exponents za{\mathit{z}}_{\mathit{a}}za​ and y are determined for the case of d=2 percolating Heisenberg antiferromagnets.
Scaling curves for the density of states and localization length of fractons near a percolation threshold are obtained for dilute and superconducting lattices in both two and three dimensions. These are used to verify the predictions of single-parameter scaling and to show that the energy dependence of the inverse localization length is consistent with known values of the spectral dimensionalities of these structures. The results demonstrate that eigenstates of an infinite, percolating, dilute structure exhibit superlocalization of the form \ensuremath{\psi}(r)\ensuremath{\sim}${\mathit{e}}^{\mathrm{\ensuremath{-}}\mathrm{\ensuremath{\beta}}\mathit{r}\mathrm{\ensuremath{\delta}}}$ with values of \ensuremath{\delta}=1.13\ifmmode\pm\else\textpm\fi{}0.06 and 1.39\ifmmode\pm\else\textpm\fi{}0.07 in two and three dimensions, respectively.