【公開日：2024.07.25】【最終更新日：2024.06.21】

課題データ / Project Data

課題番号 / Project Issue Number

23QS0004

利用課題名 / Title

イルメナイト型構造Ir酸化物における結晶場励起の系統的観測

利用した実施機関 / Support Institute

量子科学技術研究開発機構 / QST

機関外・機関内の利用 / External or Internal Use

外部利用/External Use

技術領域 / Technology Area

【横断技術領域 / Cross-Technology Area】（主 / Main）計測・分析/Advanced Characterization（副 / Sub）-

【重要技術領域 / Important Technology Area】（主 / Main）量子・電子制御により革新的な機能を発現するマテリアル/Materials using quantum and electronic control to perform innovative functions（副 / Sub）-

キーワード / Keywords

磁性材料,放射光/ Synchrotron radiation,量子効果/ Quantum effect

利用者と利用形態 / User and Support Type

利用者名（課題申請者）/ User Name (Project Applicant)

鈴木 博人

所属名 / Affiliation

東北大学学際科学フロンティア研究所

共同利用者氏名 / Names of Collaborators in Other Institutes Than Hub and Spoke Institutes

ARIM実施機関支援担当者 / Names of Collaborators in The Hub and Spoke Institutes

石井 賢司

利用形態 / Support Type

（主 / Main）共同研究/Joint Research（副 / Sub）-

利用した主な設備 / Equipment Used in This Project

QS-112：共鳴非弾性X線散乱装置

報告書データ / Report

概要（目的・用途・実施内容）/ Abstract (Aim, Use Applications and Contents)

The exactly soluble Kitaev honeycomb model provides a canonical example of quantum spin liquids and holds promise as a basis for fault-tolerant quantum computation utilizing the Majorana degrees of freedom. This model has been implemented in quantum material platform by a theoretical proposal by Jackeli and Khalliulin, which suggests that spin-orbit Mott insulators with edge-shared octahedral crystal field arrangement can host bond-dependent interactions between the J = 1/2 pseudospins. This proposal has driven the search for 4d and 5d transition metal compounds with honeycomb lattice structures that do not show magnetic phase transitions down to low temperatures. In the present experiment, we investigated ilmenite iridates AIrO₃ (A=Mg, Ir, Cd) by resonant inelastic x-ray scattering. 

実験 / Experimental

RIXS experiments were conducted using the spectrometer at SPring-8. The incident x-ray energy was tuned to the Ir L₃ absorption edge (11. 22 keV). The incident x-ray photons were pi-polarized. Scattered photons were collected at a fixed scattering angle of 90 using a Si (884) diced spherical analyzer and a CCD camera. The polarizations of the outgoing photons were not analyzed, i.e., the RIXS intensity comprises the pi-pi and pi-sigma scattering channels.  All the measurements were performed at 300 K.

結果と考察 / Results and Discussion

The figure shows the RIXS spectra of ilmenite iridates. For comparison, we also have investigated the beta-ZnIrO₃. In all the systems, we identify the transitions at ~0.9 eV that represent spin-orbit transitions to the J=3/2 state, establishing the J=1/2 description of magnetism in the ilmenite iridates. Also, we identify a systematic change in the crystal field multiplets.

図・表・数式 / Figures, Tables and Equations

Left: x-ray absorption spectrum of ilmenite iridates around the Ir L₃ edge. Right: RIXS spectra of ilmenite iridates.

その他・特記事項（参考文献・謝辞等） / Remarks(References and Acknowledgements)

成果発表・成果利用 / Publication and Patents

論文・プロシーディング（DOIのあるもの） / DOI (Publication and Proceedings)

口頭発表、ポスター発表および、その他の論文 / Oral Presentations etc.

特許 / Patents

特許出願件数 / Number of Patent Applications：0件
特許登録件数 / Number of Registered Patents：0件