The effect of spin-peierls Instability suppression in nanometer-scale-sized CuGeO3 crystalsстатья
Информация о цитировании статьи получена из
Web of Science,
Scopus
Статья опубликована в журнале из списка Web of Science и/или Scopus
Дата последнего поиска статьи во внешних источниках: 26 сентября 2016 г.
Аннотация:In this work, we study the influence of size effects on magnetic properties
of quasi-one-dimensional spin-Peierls magnet CuGeO3. It was found that the
reduction of the crystallite’s size to nanometer scale (*300 9 30 nm) leads to full
suppression of spin-Peierls transition, which takes place in the bulk material at
T 14 K. Combined analysis of electron spin resonance (ESR) and magnetic
susceptibility measurements allowed separating of the dynamic magnetization of Cu
chains vESR. Its temperature dependence is found to be typical for one-dimensional
magnets with quantum critical (QC) behavior and is described by Curie–Weiss law
v 1
TþH at high temperatures, turning into power law asymptotic v Ta ða\1Þ
with temperature decrease. The data for two samples with different synthesis times
(24 and 96 h) are analyzed in the framework of the QC behavior model. Although
the values of magnetic parameters strongly depend on the synthesis time, the
qualitative behavior is similar for both samples, which is shown by a comparative
study of QC behavior of CuGeO3 doped with 1 % of Fe. We argue that the reason
for the observed behavior is the competition between the onset of the staggered
magnetic field and dimerization effects.