Manifestation of incoherent-coherent crossover and non-Stoner magnetism in the electronic structure of Fe3GeTe2,Physical Review B

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Manifestation of incoherent-coherent crossover and non-Stoner magnetism in the electronic structure of Fe3GeTe2
Physical Review B ( IF 3.2 ) Pub Date : 2024-09-10 , DOI: 10.1103/physrevb.110.125119
Deepali Sharma ₁ , Asif Ali ₁ , Neeraj Bhatt ₁ , Rajeswari Roy Chowdhury ₁ , Chandan Patra ₁ , Ravi Prakash Singh ₁ , Ravi Shankar Singh ₁

Affiliation

Two-dimensional (2D) van der Waals ferromagnets have potential applications as next-generation spintronic devices and provide a platform to explore the fundamental physics behind 2D magnetism. The dual nature (localized and itinerant) of electrons adds further complexity to the understanding of correlated magnetic materials. Here, we present the temperature evolution of electronic structure in the 2D van der Waals ferromagnet

{Fe}_{3} {GeTe}_{2}

using photoemission spectroscopy in conjunction with density functional theory (DFT) plus dynamical mean field theory (DMFT). With the appearance of a quasiparticle peak and its evolution in the vicinity of the Fermi energy, we unveil empirical evidence of an incoherent-coherent crossover at around 125 K.

DFT + DMFT

results show that the quasiparticle lifetime surpasses thermal energy for temperature below 150 K, confirming incoherent-coherent crossover in the system. The lack of appreciable change in the Fe

2 p

core level, overall valence band spectra across the magnetic transition, and temperature-dependent ferromagnetic

DFT + DMFT

results provide substantial evidence for non-Stoner magnetism in

{Fe}_{3} {GeTe}_{2}

. We elucidate the temperature-dependent intimate relation between magnetism and electronic structure in

{Fe}_{3} {GeTe}_{2}

. A Sommerfeld coefficient of

\sim 104

{mol}^{- 1} K^{- 2}

obtained in the low-temperature limit from

DFT + DMFT

calculations resolves the long-standing issue of a large Sommerfeld coefficient

(\sim 110 mJ {mol}^{- 1} K^{- 2})

obtained from specific heat measurements.

中文翻译：

Fe3GeTe2 电子结构中非相干-相干交叉和非斯通纳磁性的表现

二维 (2D) 范德瓦尔斯铁磁体具有作为下一代自旋电子器件的潜在应用，并为探索 2D 磁性背后的基础物理提供了一个平台。电子的双重性质（局域性和流动性）进一步增加了对相关磁性材料的理解的复杂性。在这里，我们展示了二维范德华铁磁体中电子结构的温度演变