89 research outputs found
Spin wave resonances in La_{0.7}Sr_{0.3}MnO_{3} films: measurement of spin wave stiffness and anisotropy field
We studied magnetic field dependent microwave absorption in epitaxial
LaSrMnO films using an X-band Bruker ESR spectrometer. By
analyzing angular and temperature dependence of the ferromagnetic and spin-wave
resonances we determine spin-wave stiffness and anisotropy field. The spin-wave
stiffness as found from the spectrum of the standing spin-wave resonances in
thin films is in fair agreement with the results of inelastic neutron
scattering studies on a single crystal of the same composition [Vasiliu-Doloc
et al., J. Appl. Phys. \textbf{83}, 7343 (1998)].Comment: 15 pages, 7 figures (now figure captions are included
Analysis and Control of mortar Quality with ultrasonic wave attenuation
Wave propagation and attenuation on mortar material are discussed in this paper with a Non Destructive Testing (NDT) which can be used to characterize samples of mortars and effect of microstructure of sand in their hardening. Samples were manufactured using same water/cement ration (w/c) 0.65, and cement/sand ration (c/s) 0.5 in order to simulate the attenuation. The characterization of attenuation in mortar material has been performed by ultrasonic reflection technique using a transducer with central frequency 0.5MHz. It is shown that sand particle size exercises significant influence on the evolution of attenuation, the attenuation parameters give information about average state of the hardening of the mortar itself
A Study of Carbon Substitutions in MgB_2 within the two-band Eliashberg theory
We study the effects of C substitutions in MgB_2 within the two-band model in
the Eliashberg formulation. We use as input the B-B stretching-mode frequency
and the partial densities of states N_{sigma}(EF) and N_{pi}(EF), recently
calculated for Mg(B_{1-x}C_{x})_2 at various x values from first-principles
density functional methods. We then take the prefactor in the Coulomb
pseudopotential matrix, mu, and the interband scattering parameter,
Gamma^{sigma pi}, as the only adjustable parameters. The dependence on the C
content of Tc and of the gaps (Delta_{sigma} and Delta_{pi}) recently measured
in Mg(B_{1-x}C_{x})_2 single crystals indicate an almost linear decrease of mu
on increasing x, with an increase in interband scattering that makes the gaps
merge at x=0.132. In polycrystals, instead, where the gap merging is not
observed, no interband scattering is required to fit the experimental data.Comment: 7 pages, 8 figures, RevTex4. Detailed discussion of the results adde
Structure and Spin Dynamics of LaSrMnO
Neutron scattering has been used to study the structure and spin dynamics of
LaSrMnO. The magnetic structure of this system is
ferromagnetic below T_C = 235 K. We see anomalies in the Bragg peak intensities
and new superlattice peaks consistent with the onset of a spin-canted phase
below T_{CA} = 205 K, which appears to be associated with a gap at q = (0, 0,
0.5) in the spin-wave spectrum. Anomalies in the lattice parameters indicate a
concomitant lattice distortion. The long-wavelength magnetic excitations are
found to be conventional spin waves, with a gapless (< 0.02 meV) isotropic
dispersion relation . The spin stiffness constant D has a
dependence at low T, and the damping at small q follows . An
anomalously strong quasielastic component, however, develops at small wave
vector above 200 K and dominates the fluctuation spectrum as T -> T_C. At
larger q, on the other hand, the magnetic excitations become heavily damped at
low temperatures, indicating that spin waves in this regime are not eigenstates
of the system, while raising the temperature dramatically increases the
damping. The strength of the spin-wave damping also depends strongly on the
symmetry direction in the crystal. These anomalous damping effects are likely
due to the itinerant character of the electrons.Comment: 8 pages (RevTex), 9 figures (encapsulated postscript
Model for the low-temperature magnetic phases observed in doped YBa_2Cu_3O_{6+x}
A classical statistical model for the antiferromagnetic (AFM) ordering of the
Cu-spins in the CuO_2 planes of reduced YBa_2Cu_3O_{6+x} type materials is
presented. The magnetic phases considered are the experimentally observed
high-temperature AFI phase with ordering vector Q_I=(1/2,1/2,0), and the
low-temperature phases: AFII with Q_II=(1/2,1/2,1/2) and intermediate TA (Turn
Angle) phases TAI, TAII and TAIII with components of both ordering vectors. It
is shown that the AFII and TA phases result from an effective ferromagnetic
(FM) type coupling mediated by free spins in the CuO_x basal plane. Good
agreement with experimental data is obtained for realistic model parameters.Comment: 11 pages, 2 Postscript figures, Submitted to Phys.Rev.Let
Magnon Broadening Effect by Magnon-Phonon Interaction in Colossal Magnetoresistance Manganites
In order to study the magnetic excitation behaviors in colossal
magnetoresistance manganites, a magnon-phonon interacting system is
investigated. Sudden broadening of magnon linewidth is obtained when a magnon
branch crosses over an optical phonon branch. Onset of the broadening is
approximately determined by the magnon density of states. Anomalous magnon
damping at the brillouine zone boundary observed in low Curie temperature
manganites is explained.Comment: 4 pages incl. 4 figs. New e-mail: [email protected]
Spin Dynamics in the Magnetic Chains Arrays of Sr14Cu24O41: a Neutron Inelastic scattering Investigation
Below about 150 K, the spin arrangement in the chain arrays of Sr14Cu24O41 is
shown to develop in two dimensions (2D). Both the correlations and the
dispersion of the observed elementary excitations agree well with a model of
interacting dimers. Along the chains, the intra- and inter-dimer distances are
equal to 2 and about 3 times the distance (c) between neighboring Cu ions.
While the intra-dimer coupling is J about 10 meV, the inter-dimer couplings
along and between the chains are of comparable strenght, J// about -1.1 meV and
Jperp about 1.7 meV, respectively. This remarkable 2D arrangement satisfies the
formal Cu valence of the undoped compound. Our data suggest also that it is
associated with a relative sliding of one chain with respect to the next one,
which, as T decreases, develops in the chain direction. A qualitative analysis
shows that nearest inter-dimer spin correlations are ferromagnetic, which, in
such a 2D structure, could well result from frustration effects.Comment: 4 pages, 5 figures, submitted to Phys.Rev.B, date of receipt 29 June
199
Magnon Damping by magnon-phonon coupling in Manganese Perovskites
Inelastic neutron scattering was used to systematically investigate the
spin-wave excitations (magnons) in ferromagnetic manganese perovskites. In
spite of the large differences in the Curie temperatures (s) of different
manganites, their low-temperature spin waves were found to have very similar
dispersions with the zone boundary magnon softening. From the wavevector
dependence of the magnon lifetime effects and its correlation with the
dispersions of the optical phonon modes, we argue that a strong magneto-elastic
coupling is responsible for the observed low temperature anomalous spin
dynamical behavior of the manganites.Comment: 11 pages, 4 figure
Field-induced Commensurate-Incommensurate phase transition in a Dzyaloshinskii-Moriya spiral antiferromagnet
We report an observation of a commensurate-incommensurate phase transition in
a Dzyaloshinskii-Moriya spiral magnet Ba_2CuGe_2O_7. The transition is induced
by applying a magnetic field in the plane of spin rotation. In this experiment
we have direct control over the strength of the commensurate potential, while
the preferred incommensurate period of the spin system remains unchanged.
Experimental results for the period of the soliton lattice and bulk
magnetization as a function of external magnetic field are in quantitative
agreement with theory.Comment: 4 pages, 4 figures, submitted to PR
- …