van Duijn J, Kim K H, Hur N, Adroja D, Adams M A, Huang Q Z, Jaime M, Cheong S-W, Broholm C, Perring T G
Department of Physics and Astronomy, Johns Hopkins University, Baltimore, Maryland 21218, USA.
Phys Rev Lett. 2005 May 6;94(17):177201. doi: 10.1103/PhysRevLett.94.177201. Epub 2005 May 2.
We report that Bi doping drives Pr 2-x BixRu2O7 from an antiferromagnetic insulator (x = 0) to a metallic paramagnet (x approximately 1) with a broad low T maximum in C/T. Neutron scattering reveals local low energy spin excitations (variant Planck's omega approximately 1 meV) with a spectrum that is unaffected by heating to k(B)T >> variant Planck's omega. We show that a continuous distribution of splittings of the non-Kramers Pr3+ ground-state doublet such as might result from various types of lattice strain can account for all the data.
我们报道，铋掺杂使Pr₂₋ₓBiₓRu₂O₇从反铁磁绝缘体（x = 0）转变为金属顺磁体（x约为1），在C/T中出现一个宽泛的低温最大值。中子散射揭示了局部低能自旋激发（变体普朗克ω约为1毫电子伏特），其光谱不受加热至k(B)T >> 变体普朗克ω的影响。我们表明，非克莱默斯Pr³⁺基态双重态的分裂连续分布，如可能由各种晶格应变导致的那样，可以解释所有数据。
