Magneto-elastic coupling in a potential ferromagnetic 2D atomic crystal

By Yao Tian, Mason Gray, H. Ji, R. Cava, K. Burch. 2016

254 citations recorded by the source corpus.

Cr2Ge2Te6 has been of interest for decades, as it is one of only a few naturally forming ferromagnetic semiconductors. Recently, this material has been revisited due to its potential as a two-dimensional semiconducting ferromagnet and a substrate to induce anomalous quantum Hall states in topological insulators. However, many relevant properties of Cr2Ge2Te6 still remain poorly understood, especially the spin-phonon coupling crucial to spintronic, multiferrioc, thermal conductivity, magnetic proximity and the establishment of long range order on the nanoscale. We explore the interplay between the lattice and magnetism through high resolution micro-Raman scattering measurements over the temperature range from 10 to 325 K. Strong spin-phonon coupling effects are confirmed from multiple aspects: two low energy modes splits in the ferromagnetic phase, magnetic quasielastic scattering in the paramagnetic phase, the phonon energies of three modes show clear upturn below TC, and the phonon linewidths change dramatically below TC as well. Our results provide the first demonstration of spin-phonon coupling in a potential two-dimensional atomic crystal.

Subfields: Atomic and Molecular Physics, and Optics, Materials Chemistry

View Paper: https://www.semanticscholar.org/paper/7b9b04f27451bc623bd4069f4833d4a84a314263

How researchers see this paper

The researchers whose trusted networks rank it highest, strongest advocate first. Every researcher gets a different order.

In Atomic and Molecular Physics, and Optics

1. Xiaodong Xu
2. Takashi Taniguchi
3. Kenji Watanabe
4. W. Yao
5. Di Xiao
6. Wei Han
7. Xiang Zhang
8. M. McGuire

In Materials Chemistry

1. Kenji Watanabe
2. Takashi Taniguchi
3. Xiaodong Xu
4. Xiang Zhang
5. W. Yao
6. M. McGuire
7. Di Xiao
8. Wei Han

Citations in the corpus

• Giant tunneling magnetoresistance in spin-filter van der Waals heterostructures (2018, background): “According to the Onsager reciprocal relation ρij(α) = ρji(−α) (8), the coefficients for the odd-order terms are antisymmetric with respect to the i and j indices.”
• Magnon Transport in Quasi-Two-Dimensional van der Waals Antiferromagnets (2019, background): “The recent emergence of two-dimensional (2D) van der Waals magnets down to atomic-layer thickness has attracted considerable interest and provided an exciting platform for exploring new physical phenomena in low-dimensional magnetism [1-15].”
• Two-dimensional magnetic crystals and emergent heterostructure devices (2019, background): “For Cr2Ge2Te6, frequencies of a few phonons exhibit upturns while being cooled into a ferromagnetic phase, highlighting the spin-phonon coupling (100).”
• Probing and controlling magnetic states in 2D layered magnetic materials (2019, unknown): “83 ) .”