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Pb_1.83Mg_0.29Nb_1.71O_6.39 (PMN) crystallizing in a cubic pyrochlorestructure exhibits, as the first dielectrics with pyrochlore structure, typicalfeature of quantum paraelectrics - its permittivity continuously increases oncooling and levels off below ~ 30K, without any signature of a structural phasetransition. Broad-band dielectric spectra do not show any dielectric dispersionin the real part of permittivity up to 8.8 GHz. THz and infrared spectra reveala soft polar optic mode which is responsible for the temperature dependence ofthe permittivity. The leveling-off of the permittivity at low temperaturesobeys the Barrett formula and the fitted vibrational zero-point energy1/(2*k_B*T_1) corresponds to the measured soft mode frequency. The number ofobserved infrared phonons exceeds that predicted from the factor-group analysiswhich indicates that the structure is at least locally non-cubic.Comment: subm. to PRB, revised version according to referees' report

physical review. b, condensed matter and materials physics

Quantum paraelectric behavior of pyrochlore<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:msub><mml:mi mathvariant="normal">Pb</mml:mi><mml:mn>1.83</mml:mn></mml:msub><mml:msub><mml:mi mathvariant="normal">Mg</mml:mi><mml:mn>0.29</mml:mn></mml:msub><mml:msub><mml:mi mathvariant="normal">Nb</mml:mi><mml:mn>1.71</mml:mn></mml:msub><mml:msub><mml:mi mathvariant="normal">O</mml:mi><mml:mn>6.39</mml:mn></mml:msub></mml:mrow></mml:math>

Quantum paraelectric behavior of pyrochlorePb1.83Mg0.29Nb1.71O6.39