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Soft modes and structural phase transitions [PDF]

Bulletin of Materials Science, 1979
This paper presents a survey of soft modes and their relationship to structural phase transitions. After introducing the concept of a soft mode, the origin of softening is considered from a lattice-dynamical point.
G Venkataraman
exaly   +2 more sources

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A mechanism for a soft mode instability

Physics Letters A, 1980
no ...
Langford, W. F., Arneodo, A., Coullet, P., Tresser, C., Coste, J.   +4 more
openaire   +1 more source

Democracy, Legitimacy and Soft Modes of Governance in the EU: The Empirical Turn

Journal of European Integration, 2007
During the past few years, the european union (eu) has made increasing use of the so-called soft modes of governance (smg), modes based on voluntary and non-sanctioning forms of public action, where state and non-state actors interact in extensive ...
Susana Borràs
exaly   +2 more sources

Soft dipole mode in 8He

Physics of Particles and Nuclei Letters, 2009
The low-lying spectrum of 8He was studied in the 3H(6He, p)8He transfer reaction for small center of mass angles. The 0+ ground state (g.s.) of 8He and excited states, 2+ at 3.6–3.9 MeV and (1+) at 5.3–5.5 MeV, were populated with cross sections of 200, 100–250, and 90–125 μb/sr.
Grigorenko, L.V., Golovkov, M.S., Ter-Akopian, G.M., Fomichev, A.S., Oganessian, Yu.Ts., A. Gorshkov, V., Krupko, S.A., M. Rodin, A., I. Sidorchuk, S., S. Slepnev, R., V. Stepantsov, S., Wolski, R., Y. Pang, D., Chudoba, V., Korsheninnikov, A.A., A. Kuzmin, E., Nikolskii, E.Yu., Novatskii, B.G., Stepanov, D.N., Roussel-Chomaz, P., Mittig, W., Ninane, A., Hanappe, F., Stuttgé, L., Yukhimchuk, A.A., Perevozchikov, V.V., Vinogradov, Yu.I., K. Grishechkin, S., Zlatoustovskiy, S.V.   +28 more
openaire   +3 more sources

Soft modes in betaines

Ferroelectrics, 1988
Abstract Betainea are a new family of crystals including ferroelectric, antiferroelectric and incommensurate crystals /1–3/. We have used submillimeter backward wave oscillator spectroscopy /4/ to investigate the dynamical properties of betainearsenate (BA), deuterated BA (DBA), betainephosphate (BP) and betainecalciumchloride (BCC) at the frequencies ...
Yu. G. Goncharov, G. V. Kozlov, A. A. Volkov, J. Albers, J. Petzelt   +4 more
openaire   +1 more source

The spectrum of vibration modes in soft opals

The Journal of Chemical Physics, 2005
Numerous vibrational modes of spherical submicrometer particles in fabricated soft opals are experimentally detected by Brillouin light scattering and theoretically identified by their spherical harmonics by means of single-phonon scattering-cross-section calculations. The particle size polydispersity is reflected in the line shape of the low-frequency
Cheng, W., Wang, J., Jonas, U., Steffen, W., Fytas, G., Penciu, R., Economou, E.   +6 more
openaire   +3 more sources

Conformational Changes in DNA and Soft Modes

Journal of Biomolecular Structure and Dynamics, 1985
In this paper we explore the applicability of the soft mode approach to study the conformational transitions of DNA. It is believed that the A-B conformation change is a first order transition. Soft mode theories only apply to the initial stages of a first order transition.
K V, Devi Prasad, E W, Prohofsky
openaire   +2 more sources

Soft Modes and Mode Splitting in Paramagnetic TbP§

1980
In contrast to spin-only systems the paramagnetic phases of systems with crystal field split ground multiplets exhibit magnetic excitations of finite energy. In the presence of a magnetic exchange coupling the excitons will propagate through the lattice. A measurement of the dispersion allows in principle an insight into the exchange interaction, which
Knorr, K., Loidl, Alois, Kjems, J. K.
openaire   +2 more sources