CeFeAs(1-x)P(x)O 中的晶格畸变和磁量子相变。

Lattice distortion and magnetic quantum phase transition in CeFeAs(1-x)P(x)O.

机构信息

Department of Physics and Astronomy, The University of Tennessee, Knoxville, Tennessee 37996-1200, USA.

出版信息

Phys Rev Lett. 2010 Jan 8;104(1):017204. doi: 10.1103/PhysRevLett.104.017204.

DOI:10.1103/PhysRevLett.104.017204

PMID:20366390

Abstract

We use neutron diffraction to study the structural and magnetic phase diagram of CeFeAs(1-x)P(x)O. We find that replacing the larger arsenic with smaller phosphorus in CeFeAs(1-x)P(x)O simultaneously suppresses the AFM order and orthorhombic distortion near x=0.4, thus suggesting the presence of a magnetic quantum critical point. Our detailed structural analysis reveals that the pnictogen height is an important controlling parameter for their electronic and magnetic properties, and may play an important role in electron pairing and superconductivity of these materials.

摘要

我们使用中子衍射来研究 CeFeAs(1-x)P(x)O 的结构和磁相图。我们发现，在 CeFeAs(1-x)P(x)O 中用较小的磷取代较大的砷，同时抑制了近 x=0.4 处的 AFM 有序和正交畸变，这表明存在磁量子临界点。我们的详细结构分析表明，磷属元素的高度是控制它们的电子和磁性质的一个重要参数，可能在这些材料的电子对和超导性中发挥重要作用。