Spin-phonon coupling and magnetic transition in an organic molecule intercalated Cr2Ge2Te6

Published

July 10, 2024

Author(s)

Angela R. Hight Walker, Thuc Mai, Adam Biacchi

Abstract

The manipulation of spin-phonon coupling in both formations and explorations of magnetism in two-dimensional van der Waals ferromagnetic semiconductors facilitates unprecedented prospects for spintronic devices. The interlayer engineering with spin-phonon coupling promises for controllable magnetism via organic cation intercalation. Here, spectroscopic evidences reveal the intercalation effect on the intrinsic magnetic and electronic transitions in quasi-two-dimensional Cr2Ge2Te6 using tetrabutyl ammonium (TBA+) as the intercalant. The temperature-evolution of Raman modes E_g^3 and A_g^1, along with the magnetization measurements, unambiguously captures the enhancement of the ferromagnetic Curie temperature in the intercalated heterostructure. Moreover, the E_g^4 mode highlights the increased effect of spin-phonon interaction in magnetic order-induced lattice distortion. Combined with the first-principle calculations, we observed a substantial number of electrons transferred from TBA+ to Cr through the interface. The interplay between spin-phonon coupling and magnetic ordering in van der Waals magnets appeals for further understanding of the manipulation of magnetism in layered heterostructures.

Citation

Nano Letters

Volume

24

Pub Type

Journals

Download Paper

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Keywords

2D magnet, Raman, nanomagnet, 2D materials, quantum materials

Citation

Hight Walker, A. , Mai, T. and Biacchi, A. (2024), Spin-phonon coupling and magnetic transition in an organic molecule intercalated Cr2Ge2Te6, Nano Letters, [online], https://tsapps.nist.gov/publication/get_pdf.cfm?pub_id=958059 (Accessed October 13, 2025)