848 research outputs found
rCBFand the rCMRglucose in experimental hydrocephalus measured by the double tracer method of autoradiography
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Macroscopic and Local Magnetic Moments in Si-doped CuGeO with Neutron and SR Studies
The temperature-concentration phase diagram of the Si-doped spin-Peierls
compound CuGeO is investigated by means of neutron scattering and muon
spin rotation spectroscopy in order to determine the microscopic distribution
of the magnetic and lattice dimerised regions as a function of doping. The
analysis of the zero-field muon spectra has confirmed the spatial inhomogeneity
of the staggered magnetisation that characterises the antiferromagnetic
superlattice peaks observed with neutrons. In addition, the variation of the
macroscopic order parameter with doping can be understood by considering the
evolution of the local magnetic moment as well as of the various regions
contributing to the muon signal
Torsion divisors of plane curves and Zariski pairs
In this paper we study the embedded topology of reducible plane curves having
a smooth irreducible component. In previous studies, the relation between the
topology and certain torsion classes in the Picard group of degree zero of the
smooth component was implicitly considered. We formulate this relation clearly
and give a criterion for distinguishing the embedded topology in terms of
torsion classes. Furthermore, we give a method of systematically constructing
examples of curves where our criterion is applicable, and give new examples of
Zariski tuples.Comment: 19 page
Helimagnon Bands as Universal Spin Excitations of Chiral Magnets
MnSi is a cubic compound with small magnetic anisotropy, which stabilizes a
helimagnetic spin spiral that reduces to a ferromagnetic and antiferromagnetic
state in the long- and short-wavelength limit, respectively. We report a
comprehensive inelastic neutron scattering study of the collective magnetic
excitations in the helimagnetic state of MnSi. In our study we observe a rich
variety of seemingly anomalous excitation spectra, as measured in well over
twenty different locations in reciprocal space. Using a model based on only
three parameters, namely the measured pitch of the helix, the measured
ferromagnetic spin wave stiffness and the amplitude of the signal, as the only
free variable, we can simultaneously account for \textit{all} of the measured
spectra in excellent quantitative agreement with experiment. Our study
identifies the formation of intense, strongly coupled bands of helimagnons as a
universal characteristic of systems with weak chiral interactions.Comment: 8 pages, 4 figures, references updated, introduction updated,
reformatte
Correlated oscillations in Kerr parametric oscillators with tunable effective coupling
We study simultaneous parametric oscillations in a system composed of two
distributed-element-circuit Josephson parametric oscillators in the
single-photon Kerr regime coupled via a static capacitance. The energy of the
system is described by a two-bit Ising Hamiltonian with an effective coupling
whose amplitude and sign depend on the relative phase between parametric pumps.
We demonstrate that the binary phases of the parametric oscillations are
correlated with each other, and that the parity and strength of the correlation
can be controlled by adjusting the pump phase. The observed correlation is
reproduced in our simulation taking pure dephasing into account. The present
result demonstrates the tunability of the Hamiltonian parameters by the phase
of external microwave, which can be used in the the Ising machine hardware
composed of the KPO network.Comment: 9 pages, 8 figure
Positron Emission Tomography in Pituitary Tumors: A Report of Three Cases
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Long-range crystalline nature of the skyrmion lattice in MnSi
We report small angle neutron scattering of the skyrmion lattice in MnSi
using an experimental set-up that minimizes the effects of demagnetizing fields
and double scattering. Under these conditions the skyrmion lattice displays
resolution-limited Gaussian rocking scans that correspond to a magnetic
correlation length in excess of several hundred {\mu}m. This is consistent with
exceptionally well-defined long-range order. We further establish the existence
of higher-order scattering, discriminating parasitic double-scattering with
Renninger scans. The field and temperature dependence of the higher-order
scattering arises from an interference effect. It is characteristic for the
long-range crystalline nature of the skyrmion lattice as shown by simple mean
field calculations.Comment: 4 page
The New BBB Indicator of Positron Emitting Radionuclide Tracer - 45Ti-DTPA
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