707 research outputs found
Hybridization and Decay of Magnetic Excitations in two-dimensional Triangular Lattice Antiferromagnets
Elementary quasiparticles in solids such as phonons and magnons occasionally
have nontrivial interactions between them, as well as among themselves. As a
result, their energy eigenvalues are renormalized, the quasiparticles
spontaneously decay into a multi-particle continuum state, or they are
hybridized with each other when their energies are close. As discussed in this
review, such anomalous features can appear dominantly in quantum magnets but
are not, a priori, negligible for magnetic systems with larger spin values and
noncollinear magnetic structures. We review the unconventional magnetic
excitations in two-dimensional triangular lattice antiferromagnets and discuss
their implications on related issues.Comment: 18 pages, 9 figure
Quantum States of Neutrons in Magnetic Thin Films
We have studied experimentally and theoretically the interaction of polarized
neutrons with magnetic thin films and magnetic multilayers. In particular, we
have analyzed the behavior of the critical edges for total external reflection
in both cases. For a single film we have observed experimentally and
theoretically a simple behavior: the critical edges remain fixed and the
intensity varies according to the angle between the polarization axis and the
magnetization vector inside the film. For the multilayer case we find that the
critical edges for spin up and spin down polarized neutrons move towards each
other as a function of the angle between the magnetization vectors in adjacent
ferromagnetic films. Although the results for multilayers and single thick
layers appear to be different, in fact the same spinor method explains both
results. An interpretation of the critical edges behavior for the multilyers as
a superposition of ferromagnetic and antifferomagnetic states is given.Comment: 6 pages, 5 figure
Magnetocaloric properties of (RE)GaO (RE=Tb,Gd,Nd,Dy)
We report the characteristic magnetic properties of several members of the
rare earth garnet family, GdGaO (GGG), DyGaO
(DGG), TbGaO (TGG), and NdGaO (NGG), and compare
their relative potential utility for magnetocaloric cooling, including their
minimal adiabatic demagnetisation refrigeration (ADR) temperatures and relative
cooling parameters. A main objective of this work was to find potential
improvements over the magnetocaloric properties of GGG for use in low
temperature ADR cryostats. Using Tb and Dy in the RE-site offers
in principle higher saturation magnetisation and Nd gives a lower de
Gennes factor and therefore potentially low transition temperature. Our results
show that DyGaO yields an optimal relative cooling parameter
() at low applied fields and a low transition temperature, which would
allow for the design of more efficient ADR cryostats.Comment: 10 pages, 10 figures, submitted to Physical Review Applie
Optimized signal deduction procedure for the MIEZE neutron spectroscopy technique
We report a method to determine the phase and amplitude of sinusoidally
modulated event rates, binned into 4 bins per oscillation. The presented
algorithm relies on a reconstruction of the unknown parameters. It omits a
calculation intensive fitting procedure and avoids contrast reduction due to
averaging effects. It allows the current data acquisition bottleneck to be
relaxed by a factor of 4. Here, we explain the approach in detail and compare
it to the established fitting procedures of time series having 4 and 16 time
bins per oscillation. In addition we present the empirical estimates of the
errors of the three methods and compare them to each other. We show that the
reconstruction is unbiased, asymptotic, and efficient for estimating the phase.
Reconstructing the contrast, which corresponds to the amplitude of the
modulation, is roughly 10% less efficient than fitting 16 time binned
oscillations. Finally, we give analytical equations to estimate the error for
phase and contrast as a function of their initial values and counting
statistics.Comment: 14 pages, 5 figures, submitted to IOP Measurement Science and
Technolog
Magnetic excitations of the Cu quantum spin chain in SrCuPtO
We report the magnetic excitation spectrum as measured by inelastic neutron
scattering for a polycrystalline sample of SrCuPtO. Modeling the data
by the 2+4 spinon contributions to the dynamical susceptibility within the
chains, and with interchain coupling treated in the random phase approximation,
accounts for the major features of the powder-averaged structure factor. The
magnetic excitations broaden considerably as temperature is raised, persisting
up to above 100 K and displaying a broad transition as previously seen in the
susceptibility data. No spin gap is observed in the dispersive spin excitations
at low momentum transfer, which is consistent with the gapless spinon continuum
expected from the coordinate Bethe ansatz. However, the temperature dependence
of the excitation spectrum gives evidence of some very weak interchain
coupling.Comment: 9 pages, 5 figure
Correlation between bulk thermodynamic measurements and the low temperature resistance plateau in SmB6
Topological insulators are materials characterized by dissipationless,
spin-polarized surface states resulting from non-trivial band topologies.
Recent theoretical models and experiments suggest that SmB6 is the first
topological Kondo insulator, in which the topologically non-trivial band
structure results from electron-electron interactions via Kondo hybridization.
Here, we report that the surface conductivity of SmB6 increases systematically
with bulk carbon content. Further, addition of carbon is linked to an increase
in n-type carriers, larger low temperature electronic contributions to the
specific heat with a characteristic temperature scale of T* = 17 K, and a
broadening of the crossover to the insulating state. Additionally, X-ray
absorption spectroscopy shows a change in Sm valence at the surface. Our
results highlight the importance of phonon dynamics in producing a Kondo
insulating state and demonstrate a correlation between the bulk thermodynamic
state and low temperature resistance of SmB6
Renormalization of spin excitations in hexagonal HoMnO3 by magnon-phonon coupling
Hexagonal HoMnO3, a two-dimensional Heisenberg antiferromagnet, has been
studied via inelastic neutron scattering. A simple Heisenberg model with a
single-ion anisotropy describes most features of the spin-wave dispersion
curves. However, there is shown to be a renormalization of the magnon energies
located at around 11 meV. Since both the magnon-magnon interaction and
magnon-phonon coupling can affect the renormalization in a noncollinear magnet,
we have accounted for both of these couplings by using a Heisenberg XXZ model
with 1=S expansions [1] and the Einstein site phonon model [13], respectively.
This quantitative analysis leads to the conclusion that the renormalization
effect primarily originates from the magnon-phonon coupling, while the
spontaneous magnon decay due to the magnon-magnon interaction is suppressed by
strong two-ion anisotropy.Comment: 5 pages, 4 figure
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