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Implanted muon spin spectroscopy on 2-O-adamantane: a model system that mimics the liquid glasslike transitions

AuthorsRomanini, M.; Tamarit, J. L.; Pardo, L. C.; Bermejo, Francisco Javier CSIC ORCID; Fernández-Perea, Ricardo CSIC ORCID; Pratt, F. L.
KeywordsDisordered systems
Relaxation and resonance
Muon spin rotation
Issue Date17-Jan-2017
PublisherInstitute of Physics Publishing
CitationJournal of Physics Condensed Matter 29: 085405 (2017)
AbstractThe transition takingplace between two metastable phases in 2-O-adamantane, namely the Fm3m cubic, rotator phase and the lower temperature P21/c, Z = 4 substitutionally disordered crystal is studied by means of muon spin rotation and relaxation techniques. Measurements carried out under zero, weak transverse and longitudinal fields reveal a temperature dependence of the relaxation parameters strikingly similar to those exhibited by structural glass ¿ liquid transitions (Bermejo et al 2004 Phys. Rev. B 70 214202; Cabrillo et al 2003 Phys. Rev. B 67 184201). The observed behaviour manifests itself as a square root singularity in the relaxation rates pointing towards some critical temperature which for amorphous systems is located some tens of degrees above that shown as the characteristic transition temperature if studied by thermodynamic means. The implications of such findings in the context of current theoretical approaches concerning the canonical liquid-glass transition are discussed.
Publisher version (URL)https://doi.org/10.1088/1361-648X/aa530d
Identifiersdoi: 10.1088/1361-648X/aa530d
issn: 0953-8984
Appears in Collections:(CFMAC-IEM) Artículos
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