1,530 research outputs found
Ordering Process and Its Hole Concentration Dependence of the Stripe Order in La{2-x}Sr{x}NiO{4}
Ordering process of stripe order in La{2-x}Sr{x}NiO{4} with x being around
1/3 was investigated by neutron diffraction experiments. When the stripe order
is formed at high temperature, incommensurability \epsilon of the stripe order
has a tendency to show the value close to 1/3 for the samples with x at both
sides of 1/3. With decreasing temperature, however, \epsilon becomes close to
the value determined by the linear relation of \epsilon = n_h, where n_h is a
hole concentration. This variation of the \epsilon strongly affects the
character of the stripe order through the change of the carrier densities in
stripes and antiferromagnetic domains.Comment: 5 pages, 3 figures, REVTeX, to be published in Phys. Rev.
Specific heat study of spin-structural change in pyrochlore NdMoO
By measurements of specific heat, we have investigated the magnetic field
() induced spin-structural change in NdMoO that shows
spin-chirality-related magneto-transport phenomena. A broad peak around 2 K
caused by the ordering of 2-in 2-out structure of the Nd moments at zero
shifts to the lower temperature () up to around 3 T and then to the higher
above around 3 T with increasing for all the direction of . This is
due to the crossover from antiferromagnetic to ferromagnetic arrangement
between the Nd and Mo moments. While the peak increases monotonically above
3 T for //[100], another peak emerges around 0.9 K at 12 T for //[111],
which is ascribed to the ordering of 3-in 1-out structure. For //[110], a
spike like peak is observed at around 3 T, which is caused perhaps by some spin
flip transition.Comment: 5 pages, 4 figure
Electric Control of Spin Helicity in a Magnetic Ferroelectric
Magnetic ferroelectrics or multiferroics, which are currently extensively
explored, may provide a good arena to realize a novel magnetoelectric function.
Here we demonstrate the genuine electric control of the spiral magnetic
structure in one of such magnetic ferroelectrics, TbMnO3. A spin-polarized
neutron scattering experiment clearly shows that the spin helicity, clockwise
or counter-clockwise, is controlled by the direction of spontaneous
polarization and hence by the polarity of the small cooling electric field.Comment: 4 pages, 3 figure
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