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Phys Rev Lett. 2006 Jul 07;97(1):017401. doi: 10.1103/PhysRevLett.97.017401. Epub 2006 Jul 07.

Direct experimental evidence for atomic tunneling of europium in crystalline Eu8Ga16Ge30.

Physical review letters

Raphaël P Hermann, Veerle Keppens, Pierre Bonville, George S Nolas, Fernande Grandjean, Gary J Long, Hans M Christen, Bryan C Chakoumakos, Brian C Sales, David Mandrus


  1. Department of Materials Science and Engineering, The University of Tennessee, Knoxville, Tennessee 37996-2200, USA.

PMID: 16907405 DOI: 10.1103/PhysRevLett.97.017401


Mössbauer-effect and microwave absorption experimental evidence unambiguously demonstrates the presence of slow, approximately 450 MHz, tunneling of magnetic europium between four equivalent sites in Eu8Ga16Ge30, a stoichiometric clathrate. Remarkably, six of the eight europium atoms, or 11% of the constituents in this solid, tunnel between these four sites separated by 0.55 A. The off centering of the atoms or ions in crystalline clathrates appears to be a promising route for producing Rabi oscillators in solid-state materials.

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