Temperature Dependence of Spin and Bond Ordering in a Spin-Peierls System
نویسندگان
چکیده
منابع مشابه
Temperature dependence of the spin-Peierls energy gap and anomalous line shapes in CuGeO3.
Neutron scattering measurements on a large single crystal of CuGeO3 have been used to determine the temperature-dependence of the spin-Peierls energy gap. While the power law behavior of the intensity of structural superlattice peaks is well fit by I(T) ∝ (Tc − T) 2β with an exponent of β = 0.33, the exponent for the temperature dependence of the energy gap is significantly smaller than expecte...
متن کاملFrustrated spin-Peierls chains.
We study the phase diagram, ground state properties, and excitation gaps of a frustrated spin-Peierls chain, i.e. a spin-Peierls chain with both nearest neighbor exchange J1 and next nearest neighbor exchange J2. The phase diagram is calculated using a bosonization Renormalization-Group (RG) method. We propose a (bosonic) bond-operator mean field approximation to calculate the ground state prop...
متن کاملSpin-Peierls transition in TiPO4
The complex interplay between charge, orbital, spin and lattice degrees of freedom in low-dimensional systems with pronounced quantum fluctuations allows for a plethora of complex and unusual ground states. Most of the prominent examples of low-dimensional quantum antiferromagnets with exotic ground states contain Cu (3d, S = 1/2) ions with one hole present in the eg orbitals. Compounds of earl...
متن کامل0 Superexchange and lattice distortions in the spin – Peierls system
We present a study of the nearest–neighbor (nn) and next–nearest–neighbor (nnn) exchange constants between magnetic Cu centers of the spin–Peierls material CuGeO 3. The dependence of these constants on the lattice parameters (modified e.g. by variation of temperature, pressure or doping) is calculated. Based on the observation that the bond angles are more susceptible than the bond lengths we p...
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: Journal of the Physical Society of Japan
سال: 2000
ISSN: 0031-9015,1347-4073
DOI: 10.1143/jpsj.69.2634