Hermann Raphaël P, Keppens Veerle, Bonville Pierre, Nolas George S, Grandjean Fernande, Long Gary J, Christen Hans M, Chakoumakos Bryan C, Sales Brian C, Mandrus David
Department of Materials Science and Engineering, The University of Tennessee, Knoxville, Tennessee 37996-2200, USA.
Phys Rev Lett. 2006 Jul 7;97(1):017401. 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.
穆斯堡尔效应和微波吸收实验证据明确表明，在化学计量比包合物Eu8Ga16Ge30中，磁性铕在四个等效位点之间存在缓慢的、约450兆赫兹的隧穿。值得注意的是，八个铕原子中的六个，即该固体中11%的成分，在这四个间距为0.55埃的位点之间隧穿。晶体包合物中原子或离子的偏心似乎是在固态材料中产生拉比振荡器的一条有前途的途径。
