2,453 research outputs found
Hydrostatic pressure to trigger and assist magnetic transitions: baromagnetic refrigeration
The possible application of the barocaloric effect to produce solid state
refrigerators is a topic of interest in the field of applied physics. In this
work, we present experimental data about the influence of external pressure on
the magnetic properties of a manganite with phase separation. Using the Jahn
Teller effect associated with the presence of the charge ordering we were able
to follow the transition to the ferromagnetic state induced by pressure. We
also demonstrated that external pressure can assist the ferromagnetic state,
decreasing the magnetic field necessary to generate the magnetic transition.Comment: Acepted to be published in Applied Physics Letter
Simultaneous electric and magnetic field induced nonvolatile memory
We investigate the electric field induced resistive switching effect and
magnetic field induced fraction enlargement on a polycrystalline sample of a
colossal magnetoresistive compound displaying intrinsic phase coexistence. Our
data show that the electric effect (presumably related to the presence of
inhomogeinities) is present in a broad temperature range(300 to 20 K), being
observable even in a mostly homogeneous ferromagnetic state. In the temperature
range in which low magnetic field determines the phase coexistence fraction,
both effects, though related to different mechanisms, are found to determine
multilevel nonvolatile memory capabilities simultaneously.Comment: Submited to AP
The electrical current effect in phase separated La5/8-yPryCa3/8MnO3: Charge order melting vs. Joule heating
We have studied the effect of electric field on transport properties of the
prototypical phase separated manganite La5/8-yPryCa3/8MnO3 with y=0.34. Our
results show that the suggested image in which the charge ordered state is
melted by the appliance of an electric current and/or voltage has to be
revised. We were able to explain the observed resistivity drop in terms of an
artifact related to Joule heating and the particular hysteresis that the system
under study display, common to many other phase separated manganites.Comment: 2 figures. Accepted in J. Appl. Phy
O(\alpha_s) Corrections to Longitudinal Spin-Spin Correlations in e+e- -> q qbar
We calculate the corrections to longitudinal spin-spin
correlations in . For top quark pair production the
corrections to the longitudinal spin-spin asymmetry amount to
less than 1% in the -range from above -treshold up to
. In the case the
corrections reduce the asymmetry value from its value of -1 to
approximately -0.96 for -values around the Z-peak. This reduction can be
traced to finite anomalous contributions from residual mass effects which
survive the limit. We discuss the role of the anomalous contributions
and the pattern of how they contribute to spin-flip and no-flip terms.Comment: 10 pages, 2 postscript figure
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