尖晶石Co2TiO4中的磁补偿和临界行为。,Physical Chemistry Chemical Physics

当前位置： X-MOL 学术 › Phys. Chem. Chem. Phys. › 论文详情

Our official English website, www.x-mol.net, welcomes your feedback! (Note: you will need to create a separate account there.)

尖晶石Co2TiO4中的磁补偿和临界行为。
Physical Chemistry Chemical Physics ( IF 2.9 ) Pub Date : 2020-09-14 , DOI: 10.1039/d0cp03713c
Chaocheng Liu ₁ , Xucai Kan ₁ , Xiansong Liu ₁ , Zhitao Zhang ₂ , Jiyu Hu ₁

Affiliation

我们报告了尖晶石Co ₂ TiO _4中复杂的磁有序性，压力诱导的磁性，大交换偏压（EB），自旋玻璃（SG），临界行为和电子自旋共振（ESR）的研究。在补偿温度附近发生的磁补偿行为Ť_排版〜32.5 K（定义为磁化率χ _ZFC = χ _FC = 0），这可以归因于这两个批量亚晶格的磁化完全平衡彼此的行为。这种异常情况的性质可以通过外加磁场和A–B次晶格（部位）耦合的自旋方向来证明。具体地说，交换积分的值J _AA和J _BB在较低和较高的温度下分别起关键作用。突出的是，固有矫顽力H _cj在1000 MPa的压力下增加了168％，从中我们根据磁滞回线M（H）和温度相关的磁化M（T）曲线说明了反铁磁（AFM）跃迁。Co的SG行为₂的TiO ₄是由一系列的可靠的测量和拟合参数（确认τ ₀，ZV），和大的EB场也通过在不对称发现中号（ħ）曲线。此外，在我们目前的工作中，对Co ₂ TiO ₄的临界行为进行了初步研究，其临界指数（β，γ和δ）表明Co ₂ TiO中的长距离铁磁（FM）耦合伴随着短程相互作用₄。

"点击查看英文标题和摘要"

Magnetic compensation and critical behavior in spinel Co2TiO4.

We report studies of the complex magnetic ordering, pressure-induced magnetic properties, large exchange bias (EB), spin-glass (SG), critical behavior, and electron spin resonance (ESR) in spinel Co₂TiO₄. The magnetic compensation behavior occurs in the vicinity of the compensation temperature T_comp ∼ 32.5 K (defined as the susceptibility χ_ZFC = χ_FC = 0), which can be attributed to the behavior that the magnetization of two bulk sublattices balances each other completely. The nature of this unusual case is demonstrated by the spin direction upon applied field and A–B sublattice (site) coupling. Specifically, the values of exchange integrals J_AA and J_BB play a crucial role at lower and higher temperatures, respectively. It is prominent that intrinsic coercivity H_cj increases by 168% at a pressure of 1000 MPa, from which we illustrate the antiferromagnetic (AFM) transition based on magnetic hysteresis loops M(H) and temperature dependent magnetization M(T) curves. The SG behavior of Co₂TiO₄ is confirmed by a series of reliable measurements and fitting parameters (τ₀, zv), and a large EB field is also found through the asymmetry in the M(H) curve. Besides, the critical behavior of Co₂TiO₄ is studied initially in our present work, and the critical exponents (β, γ, and δ) indicate long-range ferromagnetic (FM) coupling accompanied by a short-range interaction in Co₂TiO₄.

更新日期：2020-09-23

点击分享查看原文

点击收藏

阅读更多本刊新发论文本刊介绍/投稿指南