Magnetic properties of the zigzag ladder compound SrTb2O4

IF 3.7 2区物理与天体物理 Q1 Physics and Astronomy

Physical Review B Pub Date : 2025-02-10 DOI:10.1103/physrevb.111.054415

F. Orlandi, M. Ciomaga Hatnean, D. A. Mayoh, J. P. Tidey, S. X. M. Riberolles, G. Balakrishnan, P. Manuel, D. D. Khalyavin, H. C. Walker, M. D. Le, B. Ouladdiaf, A. R. Wildes, N. Qureshi, O. A. Petrenko

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引用次数: 0

Abstract

We report on the properties of SrTb2O4, a frustrated zigzag ladder antiferromagnet, studied by single crystal neutron diffraction (with polarized neutrons in zero field and unpolarized neutrons in an applied magnetic field), as well as by neutron spectroscopy on a polycrystalline sample. The neutron scattering results are supported by single-crystal magnetization and heat capacity measurements. In zero field, neutron diffraction data show no transition to a magnetically ordered state down to the lowest experimentally available temperature of 35 mK, and the material remains magnetically disordered down to this temperature. Polarized neutron diffraction measurements reveal the presence of a diffuse scattering signal suggesting only very weak spin-spin correlations in the ground state. For H∥c (the easy magnetization direction), we followed the magnetization process using neutron diffraction measurements and observed the appearance of field-induced magnetic Bragg peaks with integer h and k indices in the (hk0) scattering plane. No magnetic peaks with a nonzero propagation vector were detected. The observed in-field data fit well to a simple two-sublattice model with magnetic moments aligned along the field direction but being significantly different in magnitude for the two inequivalent Tb3+ sites in the unit cell. Overall, the collected data point to a nonmagnetic ground state in SrTb2O4 despite the presence of strong interactions.

Published by the American Physical Society

2025

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我们报告了通过单晶中子衍射（在零磁场中使用极化中子，在外加磁场中使用非极化中子）以及多晶样品中子光谱法研究的 SrTb2O4（一种受挫之字梯反铁磁体）的性质。中子散射的结果得到了单晶磁化和热容量测量结果的支持。在零磁场中，中子衍射数据显示，在 35 mK 的最低实验温度下，材料没有过渡到磁有序态，在此温度下仍保持磁无序态。偏振中子衍射测量显示存在弥散散射信号，表明基态中只有非常微弱的自旋-自旋相关性。对于 H∥c（易磁化方向），我们使用中子衍射测量法跟踪磁化过程，观察到在（hk0）散射平面上出现了具有整数 h 和 k 指数的场致磁布拉格峰。没有检测到非零传播矢量的磁峰。观察到的场内数据与简单的双子晶格模型非常吻合，磁矩沿场方向排列，但单位晶胞中两个不等的 Tb3+ 位点的磁矩大小明显不同。总体而言，收集到的数据表明，尽管存在强相互作用，SrTb2O4 中仍存在非磁性基态。美国物理学会出版 2025

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Physical Review B 物理-物理：凝聚态物理

CiteScore

6.70

自引率

32.40%

发文量

审稿时长

3.0 months

期刊介绍： Physical Review B (PRB) is the world’s largest dedicated physics journal, publishing approximately 100 new, high-quality papers each week. The most highly cited journal in condensed matter physics, PRB provides outstanding depth and breadth of coverage, combined with unrivaled context and background for ongoing research by scientists worldwide. PRB covers the full range of condensed matter, materials physics, and related subfields, including: -Structure and phase transitions -Ferroelectrics and multiferroics -Disordered systems and alloys -Magnetism -Superconductivity -Electronic structure, photonics, and metamaterials -Semiconductors and mesoscopic systems -Surfaces, nanoscience, and two-dimensional materials -Topological states of matter