Electron spin resonance and quantum critical phenomena in VOx multiwall nanotubesстатья
Статья опубликована в высокорейтинговом журнале
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Статья опубликована в журнале из списка Web of Science и/или Scopus
Дата последнего поиска статьи во внешних источниках: 18 июля 2013 г.
Аннотация:Basing on the high frequency (60 GHz) electron spin resonance study of the VOx multiwall nanotubes (VOx-NTs) carried out in the temperature range 4.2-200 K we report: (i) the first direct experimental evidence of the presence of the anti-ferromagnetic dimers in VOx-NTs and (ii) the observation of an anomalous low temperature growth of the magnetic susceptibility for quasi-free spins, which obey the power law chi(T)similar to 1/T-alpha with the exponent alpha approximate to 0.6 in a wide temperature range 4.2-50 K. We argue that the observed departures from the Curie-Weiss behaviour. manifest the onset of the quantum critical regime And formation of the Griffiths phase as a magnetic ground state of these spin species. (C) 2008 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim