Helical Quantum States in a Strongly Frustrated Two-Dimensional Magnet |
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Authors: | A V Mikheenkov V E Valiulin A V Shvartsberg A F Barabanov |
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Institution: | 1.Moscow Institute of Physics and Technology,Dolgoprudnyi, Moscow oblast,Russia;2.Vereshchagin Institute for High-Pressure Physics,Russian Academy of Sciences,Troitsk, Moscow oblast,Russia;3.National Research Center “Kurchatov Institute,”,Moscow,Russia |
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Abstract: | Thermodynamic properties of the J1–J2–J3 quantum Heisenberg model are investigated on a square lattice with spin S = 1/2. The calculation of spin–spin correlators, spin excitation spectra, susceptibility, and heat capacity within a spherically symmetric approach shows that the third exchange J3 may qualitatively change the properties of the system. Along with standard short-range order (antiferromagnetic, ferromagnetic, and stripe) structures, various quantum helices arise. In particular, these structures may be isotropic with a local minimum of the spectrum along a circle in the Brillouin zone. The character of these states represents both ferromagnetic and antiferromagnetic “twisted” quantum spin ordering. Moreover, a range of parameters is determined in which heat capacity exhibits two-peak temperature behavior. |
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