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arXiv 0809.1357cond-mat.str-el
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Ca3Co2O6中多极有序的共振X射线散射研究

Resonant X-ray scattering investigation of the multipolar ordering in Ca3Co2O6

A. Bombardi, C. Mazzoli, S. Agrestini, M. R. Lees

摘要:

我们已经进行了共振X射线散射(RXS)研究附近的钴K边缘的单晶Ca 3Co 2 O 6。在磁有序相中,在磁传播矢量τ(1/3,1/3,1/3)处出现了一类新的弱反射。这些新的反射允许直接访问偶极-四极E1 E2散射通道。近年来,观测孤立E1 E2电磁多极子的理论可能性引起了人们的极大兴趣。不幸的是,在许多感兴趣的系统中,奇偶偶张量和奇偶奇张量的贡献发生在倒易空间中的相同位置。我们证明,在Ca 3Co 2 O 6是可能的,完全分开的奇偶校验,甚至从奇偶校验奇条款。即使在全球中心对称的系统中使用RXS观察这些条款的可能性进行了理论研究; Ca 3Co 2 O 6允许基于对称性的分离这一贡献。

英文摘要:

We have performed a resonant x-ray scattering (RXS) study near the Co K edge on a single crystal of Ca3Co2O6. In the magnetically ordered phase a new class of weak reflections appears at the magnetic propagation vector tau (1/3,1/3,1/3). These new reflections allow direct access to the dipolar-quadrupolar E1E2 scattering channel. The theoretical possibility of observing isolated E1E2 electromagnetic multipoles has attracted a lot of interest in the recent years. Unfortunately in many system of interest, parity even and parity odd tensor contributions occur at the same positions in reciprocal space. We demonstrate that in Ca3Co2O6 it is possible to completely separate the parity even from the parity odd terms. The possibility of observing such terms even in globally centrosymmetric systems using RXS has been investigated theoretically; Ca3Co2O6 allows a symmetry based separation of this contribution.

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