Nuclear magnetic resonance of3He superfluid confined in high porosity aerogel

Autor:	Jan Kycia, T. M. Haard, M. R. Rand, D. T. Sprague, William P Halperin, P. J. Hamot, Yvonne C. Lee
Rok vydání:	1995
Předmět:	Materials science Condensed matter physics Condensed Matter Physics Atomic and Molecular Physics and Optics Superfluidity Magnetization Nuclear magnetic resonance Helium-3 Phase (matter) General Materials Science Porous medium Porosity Phase diagram Bar (unit)
Zdroj:	Journal of Low Temperature Physics. 101:185-194
ISSN:	1573-7357 0022-2291
DOI:	10.1007/bf00754575
Popis:	We report pulsed nuclear magnetic resonance (NMR) measurements of the transverse frequency and magnetization of3 He confined in aerogel with 98.2% open volume porosity. A homogeneous superfluid phase is observed at pressures, P > 12 bar, accompanied by a sharp onset of frequency shifts showing little or no textural broadening; a result quite unexpected for3He confined in random porous media. The transition temperatures and order parameter are both significantly suppressed from their bulk values and the magnetization data indicate this low temperature phase is an equal-spin pairing superfluid. For NMR tipping angles greater than 40 ° the resonance frequency drops abruptly to the normal state value. This tip angle dependence is not consistent with either the bulk3He-A or3He-B superfluid phases.
Databáze:	OpenAIRE
Externí odkaz:	https://explore.openaire.eu/search/publication?articleId=doi_________::cd3ecfc3c8fc5d16295a451da154bc37 https://doi.org/10.1007/bf00754575 Zobrazit plný text záznamu Full text from SpringerLink