Anomalous Magnetism and Quantum Critical Phenomena in VOx Multi-Walled Nanotubesстатья
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: 18 июля 2013 г.
Аннотация:High frequency (60 GHz) electron spin resonance (ESR) and magnetic susceptibility were studied for VOx multi-walled nanotubes (VOx-NTs) in the range of 4.2-300 K. It is found that apart from technological impurities, the magnetism of VOx-NTs is controlled by (i) antiferromagnetic V4+ noninteracting dimmers and (ii) V4+ quasi-free spins, which at T < 50 K form a disorder driven quantum critical state. From concentration estimates, we argue the V4+ dimers are an essential element of the VOx-NTs structure.