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arXiv 1006.0341cond-mat.str-el
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金属PrMnSbO中的局域矩和对称破缺

Local moments and symmetry breaking in metallic PrMnSbO

Simon A. J. Kimber, Adrian H. Hill, Yu-Zhong Zhang, Harald O. Jeschke, Roser Valentí, Clemens Ritter, Inga Schellenberg, Wilfred Hermes, Rainer Pöttgen, Dimitri N. Argyriou

摘要:

我们报告了一个相结合的实验和理论研究的层状锑化物PrMnSbO是同构的铁磷属元素化物超导体的母相。我们发现,在室温附近的线性电阻率和费米液体的T^{2}行为低于150 K。中子粉末衍射表明,在低于\sim 230 K时,无阻C型Mn磁序发展,随后出现与诱导Pr序耦合的自旋翻转。在T \sim 35 K时,发现了四方晶系到正交晶系(T-O)的转变。第一性原理计算表明,在这种金属化合物中观察到的大磁矩是局部起源的。因此,我们的结果是不一致的巡游或挫折模型提出的对称性破缺的铁pnictides。我们表明,PrMnSbO,而不是一个罕见的例子,结构扭曲的金属驱动的f-电子自由度。

英文摘要:

We report a combined experimental and theoretical investigation of the layered antimonide PrMnSbO which is isostructural to the parent phase of the iron pnictide superconductors. We find linear resistivity near room temperature and Fermi liquid-like T^{2} behaviour below 150 K. Neutron powder diffraction shows that unfrustrated C-type Mn magnetic order develops below \sim 230 K, followed by a spin-flop coupled to induced Pr order. At T \sim 35 K, we find a tetragonal to orthorhombic (T-O) transition. First principles calculations show that the large magnetic moments observed in this metallic compound are of local origin. Our results are thus inconsistent with either the itinerant or frustrated models proposed for symmetry breaking in the iron pnictides. We show that PrMnSbO is instead a rare example of a metal where structural distortions are driven by f-electron degrees of freedom.

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