Anisotropic paramagnetic susceptibility of crystalline ruby at cryogenic temperatures

Author

Hartnett, John G. ; le Floch, Jean-Michel ; Tobar, Michael E. ; Krupka, Jerzy ; Bourgeois, Pierre-Yves

Author_Institution

Western Australia Univ., Crawley

fYear

2007

fDate

May 29 2007-June 1 2007

Firstpage

666

Lastpage

671

Abstract

The static paramagnetic susceptibility of chromium ions in sapphire (Cr³⁺ in Al₂O₃) in zero applied static magnetic field has been determined between 4.2 K and 100 K using the whispering gallery mode technique at microwave frequencies. Although sapphire exhibits a uniaxial anisotropy in permittivity, in contrast the magnetic susceptibility has been measured to only have a susceptibility component perpendicular to the crystal axis. This component showed a strong Curie law dependence below 30 K.

Keywords

magnetic susceptibility; paramagnetic materials; ruby; whispering gallery modes; Al₂O₃:Cr; Curie law; anisotropic paramagnetic susceptibility; chromium ions; cryogenic temperatures; crystalline ruby; magnetic susceptibility; microwave frequencies; static magnetic field; temperature 4.2 K to 100 K; whispering gallery mode technique; Anisotropic magnetoresistance; Chromium; Cryogenics; Crystallization; Magnetic field measurement; Magnetic susceptibility; Microwave frequencies; Paramagnetic materials; Temperature; Whispering gallery modes;

fLanguage

English

Publisher

ieee

Conference_Titel

Frequency Control Symposium, 2007 Joint with the 21st European Frequency and Time Forum. IEEE International

Conference_Location

Geneva

ISSN

1075-6787

Print_ISBN

978-1-4244-0646-3

Electronic_ISBN

1075-6787

Type

conf

DOI

10.1109/FREQ.2007.4319158

Filename

4319158