Spin dynamics and magnetism of spin systems with frustrations
Final Report Abstract
1. We studied magnetic properties of a quantum spin ladder CPPP in proximity to the isotropic limit. Remarkably, no sign of magnetic ordering was observed in the fieldinduced phase down to 40 mK. 2. We published a review article on the spin dynamics in quantum sine-Gordon chains, studied with high-field ESR studies. 3. We studied high-field spin-flop transition in the natural mineral green dioptase. The observations are described taking into account structural peculiarities of this material. 4. We performed ESR in in the molecular-based magnet CuPOF, allowing us to obtain important information on the spin-Hamiltonian parameters of this quasi-two-dimensional material. 5. Using high-field ESR technique, we observed several magnon modes in the honeycomblattice material α-RuCl3. This observation allowed us to make important statement about the nature of the elementary excitations in this frustrated material. 6. We studied the spin-dimer ground state in the anionic mixed-valence compound Rb4O6, which is driven by consecutive charge and orbital ordering transitions. 7. ESR was used to study of spin relaxation in the strong-leg spin ladder DIMPY with nonmagnetic dilution. 8. We studied low-temperature thermal conductivity of the spin-1/2 triangular-lattice Cs2CuCl4. Based on that, the one-dimensional nature of magnetic correlations was revealed in this frustrated material, in spite of its two-dimensional triangular structure. 9. We studied one- and three-dimensional quantum phase transitions and anisotropy in frustrated spin system Rb2Cu2Mo3O12. 10. We observed the 2/3 magnetization plateau in a frustrated S=1 isolated spin-triangle compound. The plateau was suggested to be as a remarkable result of the interplay between Heisenberg and biquadratic exchange interactions. 11. We studied magnetic structure and spin waves in the frustrated ferro-antiferromagnet Pb2VO(PO4)2. 12. We proposed a new approach, allowing not only to quasi-continuously tune the exchange parameters by hydrostatic pressure in spin systems with triangular lattice and staggered Dzyaloshinskii-Moriya interaction, but also to accurately monitor them. The approach was used for Cs2CuCl4, open a new direction for investigating quantum spin systems. Moreover, a number of new field-induced transitions were observed in the high-pressure phase, whose detailed interpretation remains open question. 13. We studied magnetic properties and quantum criticality in the coupled two-leg spin ladder Ba2CuTeO6. 14. We studied low-temperature magnetic structure and magnetic properties of the quasione-dimensional S=1/2 Heisenberg helimagnet CuCl2⋅2NC5H5.
Publications
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Low-temperature magnetic structure and electron paramagnetic resonance properties of the quasi-one-dimensional S=1/2 Heisenberg helimagnet CuCl2⋅2NC5H5, Phys. Rev. B 95, 195125 (2017)
Ponomaryov, A. N.; Zviagina, L.; Wosnitza, J.; Thede, M.; Ressouche, E.; Povarov, K. Yu.; Zheludev, A.; Landee, C. P. & Zvyagin, S. A.
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Unconventional spin dynamics in the honeycomb-lattice material α−RuCl3: High-field electron spin resonance studies, Phys. Rev. B 96, 241107(R) (2017)
Ponomaryov, A. N.; Schulze, E.; Wosnitza, J.; Lampen-Kelley, P.; Banerjee, A.; Yan, J.-Q.; Bridges, C. A.; Mandrus, D. G.; Nagler, S. E.; Kolezhuk, A. K. & Zvyagin, S. A.
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Evidence of one-dimensional magnetic heat transport in the triangular-lattice antiferromagnet Cs2CuCl4, Phys. Rev. Res. 1, 032022 (2019)
Schulze, E.; Arsenijevic, S.; Opherden, L.; Ponomaryov, A. N.; Wosnitza, J.; Ono, T.; Tanaka, H. & Zvyagin, S. A.
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Pressure-tuning the quantum spin Hamiltonian of the triangular lattice antiferromagnet Cs2CuCl4, Nat. Comm. 10, 1064 (2019)
Zvyagin, S. A.; Graf, D.; Sakurai, T.; Kimura, S.; Nojiri, H.; Wosnitza, J.; Ohta, H.; Ono, T. & Tanaka, H.
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Extremely well isolated two-dimensional spin- 1/2 antiferromagnetic Heisenberg layers with a small exchange coupling in the molecular-based magnet CuPOF, Phys. Rev. B 102, 064431 (2020)
Opherden, D.; Nizar, N.; Richardson, K.; Monroe, J. C.; Turnbull, M. M.; Polson, M.; Vela, S.; Blackmore, W. J. A.; Goddard, P. A.; Singleton, J.; Choi, E. S.; Xiao, F.; Williams, R. C.; Lancaster, T.; Pratt, F. L.; Blundell, S. J.; Skourski, Y.; Uhlarz, M.; Ponomaryov, A. N.; ... & Landee, C. P.
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Nature of Magnetic Excitations in the High-Field Phase of α-RuCl3, Phys. Rev. Lett. 125, 037202 (2020)
Ponomaryov, A. N.; Zviagina, L.; Wosnitza, J.; Lampen-Kelley, P.; Banerjee, A.; Yan, J.-Q.; Bridges, C. A.; Mandrus, D. G.; Nagler, S. E. & Zvyagin, S. A.
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Magnetic properties of a quantum spin ladder in proximity to the isotropic limit, Phys. Rev. B 103, 205131 (2021)
Zvyagin, S. A.; Ponomaryov, A. N.; Ozerov, M.; Schulze, E.; Skourski, Y.; Beyer, R.; Reimann, T.; Zviagina, L. I.; Green, E. L.; Wosnitza, J.; Sheikin, I.; Bouillot, P.; Giamarchi, T.; Wikara, J. L.; Turnbull, M. M. & Landee, C. P.
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Spin dynamics in quantum sine-Gordon chains: high-field ESR studies, Appl. Magn. Res. 52, 337 (2021)
Zvyagin, Sergei
