Low-frequency spin dynamics in the orthorhombic phase of La2CuO4

Magnetic susceptibility of the body-centred orthorhombic La2CuO4 system

Abstract. A model Hamiltonian representing the Cu spins in La2CuO4 in its lowtemperature body-centred orthorhombic phase, that includes both spin-orbit generated Dzyaloshinskii-Moriya interactions and interplanar exchange, is examined within the RPA utilizing a Tyablikov decoupling of various high-order Green’s functions. The magnetic susceptibility is evaluated as a function of temperature and...

Evolution of the low-frequency spin dynamics in ferromagnetic manganites

Elastic and inelastic neutron scattering was used to study two ferromagnetic manganites A1−xBxMnO3 (x ≈ 0.3) with Tc=197.9 K and 300.9 K. The spin dynamical behavior of these is similar at low temperatures, but drastically different at temperatures around Tc. While the formation of spin clusters of size (∼ 20 Å) dominates the spin dynamics of the 197.9 K sample close to Tc, the paramagnetic to ...

Spin glass state in doped La2CuO4

The lightly doped La2CuO4 of the high temperature superconducting Cu oxides shows spin glass behavior at very low temperatures, which reflects the effects of quantum fluctuations and frustration upon doping. Recent neutron scattering experiments revealed a formation of spin stripes at the same low concentration of doping. A specific relation between the two important properties of spin glass be...

the study of bright and surface discrete cavity solitons dynamics in saturable nonlinear media

امروزه سالیتون ها بعنوان امواج جایگزیده ای که تحت شرایط خاص بدون تغییر شکل در محیط منتشر می-شوند، زمینه مطالعات گسترده ای در حوزه اپتیک غیرخطی هستند. در این راستا توجه به پدیده پراش گسسته، که بعنوان عامل پهن شدگی باریکه نوری در آرایه ای از موجبرهای جفت شده، ظاهر می گردد، ضروری است، زیرا سالیتون های گسسته از خنثی شدن پراش گسسته در این سیستم ها بوسیله عوامل غیرخطی بوجود می آیند. گسستگی سیستم عامل...

Comment on "spin correlations in the paramagnetic phase and ring exchange in La2CuO4".