科學(xué)家揭示蜂窩范德華磁體中從三維反鐵磁體到二維殘余向列態(tài)的維數(shù)交叉

作者：小柯機(jī)器人 發(fā)布時(shí)間：2024/8/28 14:59:34

本期文章：《自然—物理學(xué)》：Online/在線發(fā)表

近日，美國(guó)密歇根大學(xué)的Liuyan Zhao及其研究小組與美國(guó)德克薩斯理工大學(xué)的Rui He等人合作并取得一項(xiàng)新進(jìn)展。經(jīng)過(guò)不懈努力，他們揭示蜂窩范德華磁體中從三維反鐵磁體到二維殘余向列態(tài)的維數(shù)交叉。相關(guān)研究成果已于2024年8月26日在國(guó)際知名學(xué)術(shù)期刊《自然—物理學(xué)》上發(fā)表。

該研究團(tuán)隊(duì)展示了從三維體材料中的之字形反鐵磁有序到二維幾層范德華磁體NiPS3樣品中的Z3殘余波茨向列相的轉(zhuǎn)變。自旋弛豫測(cè)量和光學(xué)光譜測(cè)量表明，隨著NiPS3層數(shù)的減少，自旋波動(dòng)在吉赫茲到太赫茲范圍內(nèi)得到增強(qiáng)。

蒙特卡洛模擬證實(shí)了實(shí)驗(yàn)中觀察到的三倍旋轉(zhuǎn)對(duì)稱性破缺，但表明在NiPS3的薄層中平移對(duì)稱性得到了恢復(fù)。因此，這項(xiàng)研究結(jié)果表明，強(qiáng)烈的量子波動(dòng)在破壞更常規(guī)磁相之后，可以穩(wěn)定一種非常規(guī)的磁相。

據(jù)悉，在低維度下顯著增強(qiáng)的波動(dòng)和無(wú)序效應(yīng)，在產(chǎn)生非平凡物質(zhì)相（如由復(fù)合序參量表征的殘余有序相）方面可能發(fā)揮至關(guān)重要的作用。然而，低維度下由波動(dòng)驅(qū)動(dòng)的磁性相仍然相對(duì)未被探索。

附：英文原文

Title: Dimensionality crossover to a two-dimensional vestigial nematic state from a three-dimensional antiferromagnet in a honeycomb van der Waals magnet

Author: Sun, Zeliang, Ye, Gaihua, Zhou, Chengkang, Huang, Mengqi, Huang, Nan, Xu, Xilong, Li, Qiuyang, Zheng, Guoxin, Ye, Zhipeng, Nnokwe, Cynthia, Li, Lu, Deng, Hui, Yang, Li, Mandrus, David, Meng, Zi Yang, Sun, Kai, Du, Chunhui Rita, He, Rui, Zhao, Liuyan

Issue&Volume: 2024-08-26

Abstract: The effects of fluctuations and disorder, which are substantially enhanced in reduced dimensionalities, can play a crucial role in producing non-trivial phases of matter such as vestigial orders characterized by a composite order parameter. However, fluctuation-driven magnetic phases in low dimensions have remained relatively unexplored. Here we demonstrate a phase transition from the zigzag antiferromagnetic order in the three-dimensional bulk to a Z3 vestigial Potts nematicity in two-dimensional few-layer samples of van der Waals magnet NiPS3. Our spin relaxometry and optical spectroscopy measurements reveal that the spin fluctuations are enhanced over the gigahertz to terahertz range as the layer number of NiPS3 reduces. Monte Carlo simulations corroborate the experimental finding of threefold rotational symmetry breaking but show that the translational symmetry is restored in thin layers of NiPS3. Therefore, our results show that strong quantum fluctuations can stabilize an unconventional magnetic phase after destroying a more conventional one.

DOI: 10.1038/s41567-024-02618-6

Source: https://www.nature.com/articles/s41567-024-02618-6

期刊信息

Nature?Physics：《自然—物理學(xué)》，創(chuàng)刊于2005年。隸屬于施普林格·自然出版集團(tuán)，最新IF：19.684

**官方網(wǎng)址：**https://www.nature.com/nphys/

**投稿鏈接：**https://mts-nphys.nature.com/cgi-bin/main.plex