AI 中文总结
该研究针对化学计量及掺杂磁铁矿，通过宽范围磁场下的磁响应测量，阐明了Verwey相变中结构畴与磁畴的相互作用机制，揭示了单斜c轴磁场诱导重取向对相变的加宽效应。
AI 中文摘要
尽管针对结构畴和磁畴开展了大量研究，但磁铁矿在$T_{\rm V}\boldsymbol{\u2248}$120 K的Verwey相变循环过程中的磁响应仍未被完全理解。例如，尽管交流磁化率在加热通过Verwey温度$T_{\rm V}$时会升高，但磁化强度可能升高也可能降低。由于在$T_{\rm V}$处存在诸多相互交织的过程，对磁变化进行多视角分析有助于阐明这些过程的本质，并确立该相变的特定特征作为诊断工具。为此，我们报告了在宽范围外加磁场条件下，磁铁矿加热通过$T_{\rm V}$时的磁响应测量结果。我们研究了合成的化学计量及掺杂（Zn、Ti、Al）单晶体，以及一块天然多晶样品，旨在解释磁化强度如何以及为何随温度通过$T_{\rm V}$发生变化。单斜晶系c轴的磁场诱导重取向可能会加宽相变，这一效应主要出现在化学计量磁铁矿中。这些发现有助于阐明该相变的机制。
英文摘要
The magnetic response of magnetite as it cycles through the Verwey transition at $T_{\rm V}\approx 120$ K remains incompletely understood, despite numerous studies of both structural and magnetic domains. For example, although the alternating-current susceptibility increases upon heating through the Verwey temperature $T_{\rm V}$, the magnetization may either increase or decrease. Since many intertwined processes occur at $T_{\rm V}$, a multifaceted view of the magnetic changes may help clarify the nature of these processes and establish specific features of the transition as diagnostic tools. To this end, we report measurements of the magnetic response of magnetite upon heating through $T_{\rm V}$ under a wide range of applied-field conditions. We studied synthetic stoichiometric and doped (Zn, Ti, and Al) single crystals, as well as a natural polycrystalline sample, with the aim of explaining how and why the magnetization changes as a function of temperature through $T_{\rm V}$. The magnetic-field-induced reorientation of the monoclinic $c$ axis may broaden the transition, primarily in stoichiometric magnetite. These findings help clarify the mechanism of the transition.
