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JahnTeller Induced Phase Transitions
Study of the Raman Active Modes for the Suzuki
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acoustic anisotropy anomaly antiferromagnetic approximation atoms axis band behaviour birefringence calculated compounds concentration configuration constant contribution correlation corresponding coupling critical crystal cubic curve decrease defects density dielectric dipole dispersion dp/dT effect electronic entropy equation excitation Fermi ferroelectric ferromagnetic figure finite fluctuations free energy frequency function Green's function Hamiltonian heat capacity hydrogen hysteresis impurity increase interaction investigated ions isomerization lattice linear low temperature magnetic field magnetic susceptibility measurements metal hydrides neutron scattering observed obtained order parameter order transition orthorhombic paramagnetic peak perovskites phase diagram phase transition phonon Phys Physical Review plane polarization potential Raman Raman scattering range region resonance room temperature sample second order shown shows soft mode solid soliton spectra spin stoichiometric structure superconducting surface susceptibility symmetry TCNQ temperature dependence tetragonal theory thermal TMMC transition metal variation vector velocity wave wave vector X-ray