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arXiv 1009.2885cond-mat.str-el
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准一维PrBa2Cu4O8中自旋涨落驱动的自旋翻转跃迁

Dimensionality-driven spin-flop transition in quasi-one-dimensional PrBa2Cu4O8

Xiaofeng Xu, A. Carrington, A. I. Coldea, A. Enayati-Rad, A. Narduzzo, S. Horii, N. E. Hussey

摘要:

在准一维铜酸盐PrBa $_2$ Cu $_4$ O $_8$中,Pr阳离子在17 K零场下反铁磁有序.通过结合磁化率,转矩磁力,比热和链间传输测量,各向异性的温度-磁场相图与此相关的排序已经绘制出来。Pr亚晶格中的低温自旋翻转转变被发现发生在与金属CuO链的基态中的维度交叉相同的磁场强度和取向处。这种巧合表明,自旋重取向是由各向异性Rudermann-Kittel-Kasuya-Yosida(RKKY)相互作用的变化驱动的,该相互作用由传导电子的有效维度的相应变化引起。

英文摘要:

In the quasi-one-dimensional cuprate PrBa$_2$Cu$_4$O$_8$, the Pr cations order antiferromagnetically at 17 K in zero field. Through a combination of magnetic susceptibility, torque magnetometry, specific heat and interchain transport measurements, the anisotropic temperature-magnetic field phase diagram associated with this ordering has been mapped out. A low-temperature spin-flop transition in the Pr sub-lattice is found to occur at the same magnetic field strength and orientation as a dimensional crossover in the ground state of the metallic CuO chains. This coincidence suggests that the spin reorientation is driven by a change in the anisotropic Rudermann-Kittel-Kasuya-Yosida (RKKY) interaction induced by a corresponding change in effective dimensionality of the conduction electrons.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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