Department of Solid State Physics, Indian Association for the Cultivation of Science, Jadavpur, Kolkata 700032, India.
J Phys Condens Matter. 2012 Mar 28;24(12):126003. doi: 10.1088/0953-8984/24/12/126003. Epub 2012 Feb 28.
We report the Griffiths phase (GP) scenario for isovalent doping in antiferromagnetic La(0.32)Eu(0.68)MnO(3). Rietveld refinement of structural data displays strong crystal structural distortion. The dc and ac magnetic studies nicely demonstrate unambiguous aspects of robust GP. The presence of ferromagnetically correlated spin clusters is found above the transition temperature, T(N). The disorder-driven phase inhomogeneity is correlated to strong structural distortion, giving rise to the GP. This is an unique example in manganite where double exchange interaction does not play any role for the observed phenomenon.
我们报告了等价掺杂反铁磁 La(0.32)Eu(0.68)MnO(3)中的 Griffiths 相 (GP) 情况。结构数据的 Rietveld 精修显示出强烈的晶体结构变形。直流和交流磁研究很好地证明了稳健 GP 的明确方面。在转变温度 T(N)以上发现了具有铁磁相关性的自旋簇。无序驱动的相非均匀性与强烈的结构变形相关，导致 GP 的出现。这是在锰氧化物中一个独特的例子，其中双交换相互作用对于观察到的现象没有任何作用。
