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

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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 December 3, 2024)