Relationship between spontaneous generation of voltage and structural features in a single crystal of Pr0.6Ca0.4MnO3статья
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Дата последнего поиска статьи во внешних источниках: 9 октября 2015 г.
Аннотация:Spontaneous generation of electrical voltage U was found for the perovskitelike single
crystal of Pr0.6Ca0.4MnO3, wherein the charge and orbital orderings occur at TCO = 240 K and
the antiferromagnetic one occurs at the Neel point TN = 174 K. With decreasing the tempera
ture, the U value increases first slowly (in the temperature range of 300 K—TCO) and then more
rapidly (TCO—TN). Starting from TN, U increases exponentially and, at 85 K, reaches the value
of 115 mV (in the ab plane) and 6.5 mV (along the c axis). The magnetic field has a different
effect on the U value in different temperature ranges: in the temperature range of 85—130 K, it
decreases U and, in the range of 130—240 K, increases U. The spontaneous voltage is thought to
be caused by the existence of ferromagnetic and chargeorbitalordered clusters of different
topology in the sample. The latter clusters have own features and their structure are described
by the noncentrosymmetric space group P21nm.