JOPSS - Search Results

Journal Articles

Breakdown of linear spin-wave theory and existence of spinon bound states in the frustrated kagome-lattice antiferromagnet

Mattan, K.*; Ono, Toshio*; Kawamura, Seiko; Nakajima, Kenji; Nambu, Yusuke*; Sato, Taku*

Physical Review B, 105(13), p.134403_1 - 134403_8, 2022/04

https://doi.org/10.1103/PhysRevB.105.134403

Times Cited Count：3 Percentile：45.85(Materials Science, Multidisciplinary)

Spin dynamics of the spin-1/2 kagome-lattice antiferromagnet Cs $_{2}$ Cu $_{3}$ SnF $_{12}$ was studied using high-resolution, time-of-flight inelastic neutron scattering. The flat mode, a characteristic of the frustrated kagome antiferromagnet, and the low-energy dispersive mode, which is dominated by magnons, can be well described by the linear spin-wave theory. However, the theory fails to describe three weakly dispersive modes between 9 and 14 meV. These modes could be attributed to two-spinon bound states, which decay into free spinons away from the zone center and at a high temperature, giving rise to continuum scattering.

Journal Articles

Gapless spin liquid in a square-kagome lattice antiferromagnet

Fujihara, Masayoshi*; Morita, Katsuhiro*; Mole, R.*; Mitsuda, Setsuo*; Toyama, Takami*; Yano, Shinichiro*; Yu, D.*; Sota, Shigetoshi*; Kuwai, Tomohiko*; Koda, Akihiro*; et al.

Nature Communications (Internet), 11, p.3429_1 - 3429_7, 2020/07

https://doi.org/10.1038/s41467-020-17235-z

Times Cited Count：39 Percentile：92.14(Multidisciplinary Sciences)

Journal Articles

=0 long-range magnetic order in centennialite CaCu $_{3}$ (OD) $_{6}$ Cl $_{2}$ 0.6D $_{2}$ O; A Spin- $frac{1}{2}$ perfect kagome antiferromagnet with $J_{1}$ - $J_{2}$ - $J_{d}$

Iida, Kazuki*; Yoshida, Hiroyuki*; Nakao, Akiko*; Jeschke, H. O.*; Iqbal, Y.*; Nakajima, Kenji; Kawamura, Seiko; Munakata, Koji*; Inamura, Yasuhiro; Murai, Naoki; et al.

Physical Review B, 101(22), p.220408_1 - 220408_6, 2020/06

https://doi.org/10.1103/PhysRevB.101.220408

Times Cited Count：22 Percentile：80.82(Materials Science, Multidisciplinary)

Crystal and magnetic structures of the mineral centennialite CaCu $_{3}$ (OD) $_{6}$ Cl $_{2}$ 0.6D $_{2}$ O are investigated by means of synchrotron X-ray diffraction and neutron diffraction measurements complemented by density functional theory (DFT) and pseudofermion functional renormalization group (PFFRG) calculations. In CaCu $_{3}$ (OD) $_{6}$ Cl $_{2}$ 0.6D $_{2}$ O, Cu $^{2+}$ ions form a geometrically perfect kagome network with antiferromagnetic $J_{1}$ . No intersite disorder between Cu $^{2+}$ and Ca $^{2+}$ ions is detected. CaCu $_{3}$ (OD) $_{6}$ Cl $_{2}$ 0.6D $_{2}$ O enters a magnetic long-range ordered state below $T_{rm N}$ = 7.2 K, and the =0 magnetic structure with negative vector spin chirality is obtained. The ordered moment at 0.3 K is suppressed to 0.58(2)B. Our DFT calculations indicate the presence of antiferromagnetic $J_{2}$ and ferromagnetic $J_{d}$ superexchange couplings of a strength which places the system at the crossroads of three magnetic orders (at the classical level) and a spin- $frac{1}{2}$ PFFRG analysis shows a dominance of =0 type magnetic correlations, consistent with and indicating proximity to the observed =0 spin structure. The results suggest that this material is located close to a quantum critical point and is a good realization of a $J_{1}$ - $J_{2}$ - $J_{d}$ kagome antiferromagnet.

Journal Articles

Quantum spin liquid in the kagome-lattice antiferromagnet and related systems

Nakano, Hiroki*; Sakai, Toru

Journal of Physics; Conference Series, 868, p.012006_1 - 012006_10, 2017/07

https://doi.org/10.1088/1742-6596/868/1/012006

Times Cited Count：3 Percentile：78.46(Physics, Applied)

The spin gap issue of the kagome lattice antiferromagnet is investigated by the finite size scaling analysis applied for the energy spectrum of the rhombic clusters calculated by the numerical exact diagonalization. The conclusion is that the kagome lattice antiferromagnet is gapless, as well as the triangular lattice one.

Journal Articles

Exotic field induced quantum phase transition of the kagome lattice antiferromagnet

Sakai, Toru; Nakano, Hiroki*

Physics Procedia, 75, p.821 - 828, 2015/12

https://doi.org/10.1016/j.phpro.2015.12.106

Times Cited Count：0 Percentile：0.04(Physics, Applied)

The magnetization process of the S=1/2 kagome-lattice antiferromagnet is investigated using the numerical diagonalization up to 42-spin clusters. The critical exponent analysis confirms the unconventional magnetization behavior around the 1/3 magnetization plateau-like anomaly; the field derivative is infinite at the low-field side, while it is zero at the high-field side. We also confirm that a magnetization jump appears at 1/3 of the saturation magnetization in distorted kagome-lattice antiferromagnets.

Journal Articles