Antiferromagnetic ordering coupled with phonon mode anomalies in rare-earth cuprate NdCu2O4, probed by nuclear quadrupole resonance and raman spectroscopy

Shinji Wada*, Hiroshi Sugiata, Daisuke Sawai, Takeshi Mito, Minoru Osada, Robert A. Fisher, Norman E. Phillips, Jeanne L. Luce, Angelica M. Stacy

*この研究の対応する著者

研究成果: Article査読

抄録

We found evidence that two successive antiferromagnetic orderings of a rare earth cuprate NdCu2O4 (nonstandard monoclinic structure with magnetic Cu(1) and nonmagnetic Cu(2) sites) are strongly coupled with phonon mode anomalies. The nuclear quadrupole resonance frequency of 63,65Cu on the Cu(2) site shows a step decrease below each of the ordering temperatures TN1 ∼ 20 K and TN2 ∼ 10 K, that originates from changes in the symmetry of the charge distribution on the surrounding lattice. In the Raman spectrum, the shift of a phonon mode near 300 cm-1 displays an anomalous temperature dependence, which suggests a hardening of the lattice below TN1 and a softening below T N2. The Cu2+ spins on the Cu(1) site order antiferromagnetically below TN1, and the complex magnetic behavior is ascribed to the variations in the exchange interactions between the Cu(1) spins and in the paramagnetic spin polarization of Nd3+ below T N2.

本文言語English
ページ(範囲)2076-2081
ページ数6
ジャーナルJournal of the Physical Society of Japan
74
7
DOI
出版ステータスPublished - 2005 7月
外部発表はい

ASJC Scopus subject areas

  • 物理学および天文学(全般)

フィンガープリント

「Antiferromagnetic ordering coupled with phonon mode anomalies in rare-earth cuprate NdCu2O4, probed by nuclear quadrupole resonance and raman spectroscopy」の研究トピックを掘り下げます。これらがまとまってユニークなフィンガープリントを構成します。

引用スタイル