杨森点接触光谱法揭示 VS2 和 VSe2 中的电子-声子相互作用、磁性相变、电荷密度波和电阻开关

IF 0.6 4区 物理与天体物理 Q4 PHYSICS, APPLIED Low Temperature Physics Pub Date : 2024-08-06 DOI:10.1063/10.0027924
D. L. Bashlakov, O. E. Kvitnitskaya, S. Aswartham, G. Shipunov, L. Harnagea, D. V. Efremov, B. Büchner, Yu. G. Naidyuk
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引用次数: 0

摘要

由于 VS2 和 VSe2 在磁有序性、电荷密度波 (CDW)、突现超导性等方面具有良好的物理特性,且对化学计量和降维非常敏感,因此它们在过渡金属二掺杂化物中尤其受到关注。Yanson点接触(PC)光谱研究揭示了VSe2 PC中的金属态和非金属态,并在20 K附近检测到磁性相变。VSe2 的 PC 光谱显示出金属特性,这使我们能够检测到与 EPI 和 CDW 转变相关的特征。两种化合物都出现了 Kondo 效应,这显然是由于层间钒离子造成的。此外,通过施加偏置电压(约 0.4 V),在 VSe2 上的 PC 中观察到了低电阻(主要是金属型状态)和高电阻非金属型状态之间的电阻切换。施加极性相反的电压(约 0.4 V)时,则会发生反向切换。原因可能是在高电场作用下,V 离子向层间迁移,从而改变了 PC 内核的化学计量。观察到的电阻开关现象表明,VSe2 是一种具有潜力的材料,例如可用于非易失性电阻式 RAM、神经形态工程和其他纳米电子应用。此外,VSe2 作为一种具有磁性转变的稀有层状范德华化合物也备受关注。
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Electron-phonon interaction, magnetic phase transition, charge density waves, and resistive switching in VS2 and VSe2 revealed by Yanson point-contact spectroscopy
VS2 and VSe2 have attracted particular attention among the transition metals dichalcogenides because of their promising physical properties concerning magnetic ordering, charge density wave (CDW), emergent superconductivity, etc., which are very sensitive to stoichiometry and dimensionality reduction. Yanson point-contact (PC) spectroscopic study reveals metallic and nonmetallic states in VS2 PCs, as well as a magnetic phase transition, was detected near 20 K. The rare PC spectra, where the magnetic phase transition was not visible, show a broad maximum of around 20 mV, likely connected with electron-phonon interaction (EPI). The PC spectra of VSe2 demonstrate metallic behavior, which allowed us to detect features associated with EPI and CDW transition. The Kondo effect appeared for both compounds, apparently due to interlayer vanadium ions. Besides, the resistive switching was observed in PCs on VSe2 between a low resistive, mainly metallic-type state, and a high resistive nonmetallic-type state by applying bias voltage (about 0.4 V). Reverse switching occurs by applying a voltage of opposite polarity (about 0.4 V). The reason may be the alteration of stoichiometry in the PC core due to the displacement of V ions to interlayer under a high electric field. The observed resistive switching characterizes VSe2 as a potential material, e.g., for non-volatile resistive RAM, neuromorphic engineering, and other nanoelectronic applications. Per contra, VS2 attracts attention as a rare layered van der Waals compound with magnetic transition.
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来源期刊
Low Temperature Physics
Low Temperature Physics 物理-物理:应用
CiteScore
1.20
自引率
25.00%
发文量
138
审稿时长
3 months
期刊介绍: Guided by an international editorial board, Low Temperature Physics (LTP) communicates the results of important experimental and theoretical studies conducted at low temperatures. LTP offers key work in such areas as superconductivity, magnetism, lattice dynamics, quantum liquids and crystals, cryocrystals, low-dimensional and disordered systems, electronic properties of normal metals and alloys, and critical phenomena. The journal publishes original articles on new experimental and theoretical results as well as review articles, brief communications, memoirs, and biographies. Low Temperature Physics, a translation of the copyrighted Journal FIZIKA NIZKIKH TEMPERATUR, is a monthly journal containing English reports of current research in the field of the low temperature physics. The translation began with the 1975 issues. One volume is published annually beginning with the January issues.
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