Anisotropic paramagnetic susceptibility of crystalline ruby at cryogenic temperatures

John Hartnett, Michael Tobar, J.G. Le Floch, J. Krupka, P.F. Bourgeois

Research output: Contribution to journalArticlepeer-review

20 Citations (Web of Science)


The static paramagnetic susceptibility of chromium ions in sapphire (Cr3+ in Al2O3) in zero applied static magnetic field has been determined between 4.2 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 have a susceptibility component only perpendicular to the crystal axis. This component showed a strong Curie law dependence below 30 K.
Original languageEnglish
Pages (from-to)online - approx 5-20pp
JournalPhysical Review B
Issue number2
Publication statusPublished - 2007


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