Ferromagnetic ordering of the proton spins in Ca(OH)2at negative spin temperatures

Autor:	J.C.M. Sprenkels, N.J. Poulis, W Th Wenckebach
Rok vydání:	1983
Předmět:	Materials science Condensed matter physics Spins Proton Dynamic nuclear polarisation Relaxation (NMR) General Engineering General Physics and Astronomy Condensed Matter Physics Dipole Ferromagnetism Spin diffusion Condensed Matter::Strongly Correlated Electrons Spin (physics)
Zdroj:	Journal of Physics C: Solid State Physics. 16:4425-4445
ISSN:	0022-3719
DOI:	10.1088/0022-3719/16/22/017
Popis:	Experimental evidence is presented for a ferromagnetic ordering with domains of the proton spins in Ca(OH)2. This ordering was produced by dynamic nuclear polarisation (DNP) and adiabatic demagnetisation in the rotating frame (ADRF) and occurred at negative spin temperature. The transverse and longitudinal susceptibilities were measured and were in agreement with theoretical predictions for a ferromagnetic ordering with domain structure. Further evidence for such a type of ordering is contained in the relaxation behaviour of the dipole energy after ADRF. The observed relaxation behaviour was found to be due to spin diffusion between the ferromagnetic domains. From these relaxation data the size of the domains could be calculated.
Databáze:	OpenAIRE
Externí odkaz:	https://explore.openaire.eu/search/publication?articleId=doi_________::5e53182c84f78680e2e561f65d7e8deb https://doi.org/10.1088/0022-3719/16/22/017 Zobrazit plný text záznamu