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Enhanced ferromagnetism in an artificially stretched lattice in quasi-two-dimensional Cr2Ge2Te6

Hiroshi Idzuchi1,2,3,4,*,†, Andres E. Llacsahuanga Allcca3,5,*, Anh Khoa Augustin Lu6,7, Mitsuhiro Saito1,8, Subhadip Das9, John F. Ribeiro10, Michel Houssa11, Ruishen Meng11, Kazutoshi Inoue1 et al.

Xing-Chen Pan1, Katsumi Tanigaki1,12, Yuichi Ikuhara1,8, Takeshi Nakanishi6, and Yong P. Chen1,2,3,5,9,10,‡

  • *These authors contributed equally to this work.
  • †Contact author: hiroshi.idzuchi@phys.u-tokyo.ac.jp
  • ‡Contact author: yongchen@purdue.edu

Phys. Rev. B 111, L020402 – Published 7 January, 2025

DOI: https://doi.org/10.1103/PhysRevB.111.L020402

Abstract

Crystal lattice is key in understanding magnetic interactions between atoms in solids. As the effective control of the lattice via tensile stress is limited, there are only a few demonstrations of controlling magnetic properties by expanding the lattice. This study reveals a clear correlation between enhanced magnetism, where Curie temperature (TC) is doubled from ∼60 to ∼120 K, and lattice expansion in prototypical van der Waals magnet Cr2Ge2Te6 with sputtered dielectric overlayers NiO and MgO. We ascribe the mechanism of this TC increase to a change in exchange interactions induced by strain, studied by several experimental probes and computational approaches.

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