Critical fluctuation and noise spectra in two-dimensional Fe$_{3}$GeTe$_{2}$ magnets

• URL: http://arxiv.org/abs/2407.00647v1
• Date: Sun, 30 Jun 2024 10:18:08 GMT
• Title: Critical fluctuation and noise spectra in two-dimensional Fe$_{3}$GeTe$_{2}$ magnets
• Authors: Yuxin Li, Zhe Ding, Chen Wang, Haoyu Sun, Zhousheng Chen, Pengfei Wang, Ya Wang, Ming Gong, Hualing Zeng, Fazhan Shi, Jiangfeng Du,
• Abstract summary: Critical fluctuations play a fundamental role in determining the spin orders for low-dimensional quantum materials. We employ the quantum decoherence imaging technique utilizing nitrogen-vacancy centers in diamond to explore the critical magnetic fluctuations.
• Score: 24.442543023868097
• License: http://arxiv.org/licenses/nonexclusive-distrib/1.0/
• Abstract: Critical fluctuations play a fundamental role in determining the spin orders for low-dimensional quantum materials, especially for recently discovered two-dimensional (2D) magnets. Here we employ the quantum decoherence imaging technique utilizing nitrogen-vacancy centers in diamond to explore the critical magnetic fluctuations and the associated temporal spin noise in van der Waals magnet $\rm{Fe_{3}GeTe_{2}}$. We show that the critical fluctuation contributes to a random magnetic field characterized by the noise spectra, which can be changed dramatically near the critical temperature $T_c$. A theoretical model to describe this phenomenon is developed, showing that the spectral density is characterized by a $1/f$ noise near the $T_c$, while away from this point it behaves like a white noise. The crossover at a certain temperature between these two situations is determined by changing of the distance between the sample and the diamond. This work provides a new way to study critical fluctuation and to extract some of the critical exponents, which may greatly deepen our understanding of criticality in a wide range of physical systems.

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