Zobrazeno 1 - 10
of 345
pro vyhledávání: '"Schwabl, F."'
Autor:
Pavlenko, N., Schwabl, F.
Publikováno v:
Appl. Phys. A 80, 217(2005)
We present a phenomenological model of periodic ferroelectric-superconductor (FE-S) heterostructures containing two alternating ferroelectric and superconducting layers. The interaction at the FE-S contacts is described as a coupling of the local car
Externí odkaz:
http://arxiv.org/abs/cond-mat/0309250
The critical fluctuations in SrTiO$_3$ near its $105 K$ structural phase transition were studied with triple axis diffractometry using high energy ($\ge 100 keV$) synchrotron radiation in different SrTiO$_3$ crystals with different oxygen vacancy con
Externí odkaz:
http://arxiv.org/abs/cond-mat/0006127
Publikováno v:
Phys. Rev. B 60, 9630 (1999)
We study the critical dynamics of three-dimensional ferromagnets with uniaxial anisotropy by taking into account exchange and dipole-dipole interaction. The dynamic spin correlation functions and the transport coefficients are calculated within a mod
Externí odkaz:
http://arxiv.org/abs/cond-mat/9904025
We investigate antiferromagnetic spin chains, which are coupled by a weak antiferromagnetic exchange interaction on a hexagonal lattice. We particulary study the role of the dipole-dipole interaction within the framework of a Heisenberg model with ne
Externí odkaz:
http://arxiv.org/abs/cond-mat/9810402
Autor:
Frey, E., Schwabl, F., Henneberger, S., Hartmann, O., Waeppling, R., Kratzer, A., Kalvius, G. M.
Publikováno v:
Phys. Rev. Lett. 79, 5142 (1997)
We resolve a longstanding puzzle for the static and dynamic critical behavior of Gadolinium by a combined theoretical and experimental investigation. It is shown that the spin dynamics of a three dimensional ferromagnet with hcp lattice structure and
Externí odkaz:
http://arxiv.org/abs/cond-mat/9708008
Autor:
Pich, C., Schwabl, F.
We study planar ferromagnetic spin-chain systems with weak antiferromagnetic inter-chain interaction and dipole-dipole interaction. The ground state depends sensitively on the relative strengths of antiferromagnetic exchange and dipole energies kappa
Externí odkaz:
http://arxiv.org/abs/cond-mat/9705280
We report on the properties of a dipolar, antiferromagnetic chain in the framework of linear spin-wave theory. The phase diagram is calculated for an arbitrary ratio of dipolar interaction to exchange interaction and for fields both parallel and perp
Externí odkaz:
http://arxiv.org/abs/cond-mat/9703218
Autor:
Pich, C., Schwabl, F.
The magnetic phase diagram of the quasi one-dimensional spinchain system CsNiF$_3$ below the N\'eel temperature is determined. For magnetic fields perpendicular to the spin chains incommensurate phases are predicted. From linear spin-wave theory we o
Externí odkaz:
http://arxiv.org/abs/cond-mat/9701064
Inelastic neutron scattering measurements were performed on the ferromagnetic chain system CsNiF_3 in the collinear antiferromagnetic ordered state below T_N = 2.67K. The measured spin wave dispersion was found to be in good agreement with linear spi
Externí odkaz:
http://arxiv.org/abs/cond-mat/9608085
Autor:
Schwabl, F., Täuber, U. C.
Publikováno v:
Phil. Trans. R. Soc. A 354 (1996) 2847
We review the theory of second--order (ferro--)elastic phase transitions, where the order parameter consists of a certain linear combination of strain tensor components, and the accompanying soft mode is an acoustic phonon. In three--dimensional crys
Externí odkaz:
http://arxiv.org/abs/cond-mat/9607028