Zobrazeno 1 - 10
of 293
pro vyhledávání: '"Dmitriev, D. V."'
Autor:
Dmitriev, D. V., Krivnov, V. Ya.
The spin-$\frac{1}{2}$ Heisenberg diamond chain with ferro- and antiferromagnetic exchange interactions is studied. The phase boundary in the parametric space of these interactions is determined, where the transition between the ferromagnetic and oth
Externí odkaz:
http://arxiv.org/abs/2410.05418
Autor:
Dmitriev, D. V., Krivnov, V. Ya.
Publikováno v:
J. Phys.: Condens. Matter 36, 195801 (2024)
We study the frustrated spin-$\frac{1}{2}$ model consisting of a linear chain of triangles with ferro (F)- and antiferromagnetic (AF) interactions connected by ferromagnetic interactions (triangles chain). The ground state phase diagram as a function
Externí odkaz:
http://arxiv.org/abs/2312.05544
Autor:
Dmitriev, D. V., Krivnov, V. Ya.
Publikováno v:
J. Phys.: Condens. Matter 35 (44), 445802 (2023)
We study the delta-chain with spin-$1$ on basal sites and spin-$\frac{1}{2}$ on apical sites. The Heisenberg interaction between neighbor basal spins is antiferromagnetic (AF) and the interaction between basal and apical spins is ferromagnetic (F). W
Externí odkaz:
http://arxiv.org/abs/2305.18124
Publikováno v:
Monthly Notices of the Royal Astronomical Society, Volume 520, Issue 3, April 2023, Pages 3706-3711
It has been shown that during the outburst of accretion activity observed in UX Ori type star RZ Psc in 2013, the accretion rate increased approximately by an order of magnitude. This means that the accretion process at the late stages of the Pre-Mai
Externí odkaz:
http://arxiv.org/abs/2301.11693
Autor:
Krivnov, V. Ya., Dmitriev, D. V.
Publikováno v:
Journal of Physics: Condensed Matter, 35(9), 095802 (2023)
We investigate spin-$\frac{1}{2}$ anisotropic model of a linear chain of triangles with competing ferro- and antiferromagnetic interactions and ferromagneic Heisenberg interactions between triangles. For a certain ratio between interactions the one-m
Externí odkaz:
http://arxiv.org/abs/2209.14459
Autor:
Dmitriev, D. V., Krivnov, V. Ya.
Publikováno v:
J. Phys.: Condens. Matter 33, 435802 (2021)
We consider a class of anisotropic spin-$\frac{1}{2}$ models with competing ferro- and antiferromagnetic interactions on two-dimensional Tasaki and kagome lattices consisting of corner sharing triangles. For certain values of the interactions the gro
Externí odkaz:
http://arxiv.org/abs/2106.07965
Publikováno v:
Condens. Matter Phys., 2020, vol. 23, No. 4, 43710
In contrast to strongly frustrated classical systems, their quantum counterparts typically have a non-degenerate ground state. A counterexample is the celebrated Heisenberg sawtooth spin chain with ferromagnetic zigzag bonds $J_1$ and competing antif
Externí odkaz:
http://arxiv.org/abs/2009.05809
Publikováno v:
Eur. Phys. J. B (2020) 93: 161
We consider the strongly anisotropic spin-1/2 $XXZ$ model on the sawtooth-chain lattice with ferromagnetic longitudinal interaction $J^{zz}=\Delta J$ and aniferromagnetic transversal interaction $J^{xx}=J^{yy}=J>0$. At $\Delta=-1/2$ the lowest one-ma
Externí odkaz:
http://arxiv.org/abs/2004.14730
Publikováno v:
Phys. Rev. B 101, 054427 (2020)
We study the thermodynamics of the delta-chain with competing ferro- and antiferromagnetic interactions in an external magnetic field which generalizes the field-free case studied previously. This model plays an important role for the recently synthe
Externí odkaz:
http://arxiv.org/abs/1911.03081
Publikováno v:
Phys. Rev. B 99, 094410 (2019)
Motivated by a novel cyclic compound $Fe_{10}Gd_{10}$ with record ground state spin in which the arrangement of magnetic ions with $s=\frac{5}{2}$ and $s=\frac{7}{2}$ corresponds to a saw-tooth chain we investigate the thermodynamics of the delta-cha
Externí odkaz:
http://arxiv.org/abs/1812.10760