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arXiv 1701.08271cond-mat.str-elcond-mat.mtrl-sci
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掺杂对多铁性(Y,Lu)MnO3单晶三聚化和磁电耦合的影响

Doping effects on trimerization and magnetoelectric coupling of single crystal multiferroic (Y,Lu)MnO3

Seongil Choi, Hasung Sim, Sunmin Kang, Ki-Young Choi, Je-Geun Park

摘要:

Hexanonal RMnO 3是一种多铁性化合物,在反铁磁转变温度下具有巨大的自旋-晶格耦合[1]。尽管在过去的二十年里进行了广泛的研究,但是,强自旋-晶格耦合的起源和潜在的微观机制仍然非常难以捉摸。在这项研究中,我们试图解决这个问题,通过测量的热膨胀和介电常数的掺杂单晶Y1-xLuxMnO 3与x = 0,0.25,0.5,0.75,和1.0。从这些测量中,我们确认,有一个渐进的变化,掺杂的物理性质。与此同时,我们所有的样品在TN处都表现出明显的异常,即使在x = 0.5和0.75的样品中也是如此,这与一些早期的想法相反,这表明异常的不寻常的掺杂依赖性。我们的工作揭示了另一个有趣的方面的自旋晶格耦合问题在六方RMnO 3。

英文摘要:

Hexagonal RMnO3 is a multiferroic compound with a giant spin-lattice coupling at an antiferromagnetic transition temperature [1]. Despite extensive studies over the past two decades, however, the origin and underlying microscopic mechanism of the strong spin-lattice coupling remain still very much elusive. In this study, we have tried to address this problem by measuring the thermal expansion and dielectric constant of doped single crystals Y1-xLuxMnO3 with x = 0, 0.25, 0.5, 0.75, and 1.0. From these measurements, we confirm that there is a progressive change in the physical properties with doping. At the same time, all our samples exhibit clear anomalies at TN, even in the samples with x = 0.5 and 0.75 as opposed to some earlier ideas, which suggests an unusual doping dependence of the anomaly. Our work reveals yet another interesting facet of the spin lattice coupling issue in hexagonal RMnO3.

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