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- W2014364043 abstract "We study the ground state properties of the Heisenberg spin-$frac{1}{2}$ chain with ferromagnetic nearest-neighbor and antiferromagnetic next-nearest-neighbor interactions using two approximate methods. One of them is the Jordan-Wigner mean-field theory and another approach is based on the transformation of spin operators to Bose ones and on the variational treatment of bosonic Hamiltonian. Both approaches give close results for the ground state energy and the magnetization curve at $T=0$. It is proved that quantum fluctuations change the classical critical exponents in the vicinity of the transition point from the ferromagnetic to the singlet ground state. The magnetization processes display a different behavior in the regions near and far from the transition point. The relation of the obtained results to the experimental magnetization curve in ${mathrm{Rb}}_{2}{mathrm{Cu}}_{2}{mathrm{Mo}}_{3}{mathrm{O}}_{12}$ is discussed." @default.
- W2014364043 created "2016-06-24" @default.
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- W2014364043 date "2006-01-03" @default.
- W2014364043 modified "2023-10-18" @default.
- W2014364043 title "Frustrated ferromagnetic spin-<mml:math xmlns:mml=http://www.w3.org/1998/Math/MathML display=inline><mml:mstyle scriptlevel=1><mml:mfrac bevelled=false><mml:mn>1</mml:mn><mml:mn>2</mml:mn></mml:mfrac></mml:mstyle></mml:math>chain in a magnetic field" @default.
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- W2014364043 doi "https://doi.org/10.1103/physrevb.73.024402" @default.
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