Spin Flop in 1D Quantum Antiferromagnets
نویسندگان
چکیده
منابع مشابه
Surface spin-flop and discommensuration transitions in antiferromagnets
Phase diagrams as a function of anisotropy D and magnetic field H are obtained for discommensurations and surface states for an antiferromagnet in which H is parallel to the easy axis, by modeling it using the ground states of a one-dimensional chain of classical XY spins. A surface spin-flop phase exists for all D, but the interval in H over which it is stable becomes extremely small as D goes...
متن کاملOn the Problem of Spin Diffusion in 1D Antiferromagnets
We study the problem of spin diffusion in magnetic systems without longrange order. We discuss the example of the 1D spin chain. For the system described by the Heisenberg Hamiltonian we show that there are no diffusive excitations. However, the addition of an arbitrarily small dissipation term, such as the spin-phonon interaction leads to diffusive excitations in the long time limit. For those...
متن کاملSpin-wave interactions in quantum antiferromagnets
– We study spin-wave interactions in quantum antiferromagnets by expressing the usual magnon annihilation and creation operators in terms of Hermitian field operators representing transverse staggered and ferromagnetic spin fluctuations. In this parameterization, which was anticipated by Anderson in 1952, the two-body interaction vertex between staggered spin fluctuations vanishes at long wavel...
متن کاملSpin stiffness of mesoscopic quantum antiferromagnets.
We study the spin stiffness of a one-dimensional quantum antiferromagnet in the whole range of system sizes L and temperatures T . We show that for integer and halfodd integer spin case the stiffness differs fundamentally in its L and T dependence, and that in the latter case the stiffness exhibits a striking dependence on the parity of the number of sites. Integer spin chains are treated in te...
متن کاملSpin-Peierls and spin-Hquid phases of Kagomb quantum antiferromagnets
The ground state of the spin-i nearest-neighbor Heisenberg quantum antiferromagnet on the KagomC lattice probably lacks &in order; therefore, conventional spin-wave analysis breaks down. To ascertain the ground state, we instead use a systematic l/n expansion with .SU(n) fermions. Two distinct states occur in the large-n limit, depending on the size of the biquadratic interaction z When ?=O, th...
متن کاملذخیره در منابع من
با ذخیره ی این منبع در منابع من، دسترسی به آن را برای استفاده های بعدی آسان تر کنید
ژورنال
عنوان ژورنال: Progress of Theoretical Physics Supplement
سال: 2002
ISSN: 0375-9687
DOI: 10.1143/ptps.145.125