Magnetic ground state of new ilmenite oxide CoIrO3 studied by muSR

We propose to perform muon spin relaxation experiment on a new ilmenite compound CoIrO3. Honeycomb-based iridates, ruthenium chloride, and cobaltates are recently attracting attention as a possible realization of Kitaev spin liquid. However, most candidate materials undergo magnetic ordering instead of spin-liquid state. We explored new honeycomb cobaltates by employing soft-chemical synthesis and obtained ilmenite-type CoIrO3. The compound may possess two different Kitaev honeycomb planes composed of Co2+ and Ir4+. Magnetic susceptibility of CoIrO3 shows anomalies at 115 and 80 K, but only subtle features are seen in specific heat. Therefore, the presence of magnetic order is not conclusive yet. To pin down this point, we perform ZF-muSR experiments. In addition, to study the spin dynamics, longitudinal-field measurements will be conducted. This experiment will give a clue for the potential complex magnetism of this unique Kitaev magnet.

本研究提出对新型钛铁矿型（ilmenite）化合物CoIrO3开展μ子自旋弛豫（muon spin relaxation）实验。近年来，蜂窝状铱基化合物、氯化钌以及钴酸盐作为基塔耶夫自旋液体（Kitaev spin liquid）的潜在实现体系受到广泛关注，但多数候选材料往往呈现磁有序态而非自旋液体态。我们通过软化学合成（soft-chemical synthesis）探索新型蜂窝状钴酸盐，成功获得钛铁矿型CoIrO3。该化合物可能存在由二价钴离子（Co²+）与四价铱离子（Ir⁴+）构成的两种不同基塔耶夫蜂窝平面。CoIrO3的磁化率（magnetic susceptibility）在115 K与80 K处出现反常，但比热（specific heat）仅展现出微弱特征，因此目前尚无法确凿判定其是否存在磁有序。为明确这一问题，我们将开展零场μ子自旋弛豫（ZF-muSR）实验；此外，为研究自旋动力学，还将进行纵向场（longitudinal-field）测量。本实验将为解析这一独特基塔耶夫磁体的潜在复杂磁行为提供关键线索。

搜集汇总

背景与挑战

背景概述

该数据集来自ISIS中子与μ子源的实验，研究新型钛铁矿氧化物CoIrO3的磁性基态，使用μ子自旋弛豫（muSR）技术探索其作为Kitaev自旋液体候选材料的潜力。数据以RAW/Nexus格式存储，预计于2028年3月21日公开释放，旨在通过实验确认材料的磁性有序性和自旋动力学行为。