Near-infrared transitions in iron-based diluted magnetic semiconductors: Effect of strong electron-phonon coupling

Abstract Exciton dynamics can be strongly affected by lattice vibrations through electron-phonon coupling. This is rarely explored in two-dimensional magnetic semiconductors. Focusing on bilayer CrI3, we first show the presence of strong electron-phonon coupling through temperature-dependent photoluminescence and absorption spectroscopy. We then report the observation of periodic broad modes up to the 8th order in Raman spectra, attributed to the polaronic character of excitons. We establish that this polaronic character is dominated by the coupling between the charge-transfer exciton at 1.96 eV and a longitudinal optical phonon at 120.6 cm−1. We further show that the emergence of long-range magnetic order enhances the electron-phonon coupling strength by ~50% and that the transition from layered antiferromagnetic to ferromagnetic order tunes the spectral intensity of the periodic broad modes, suggesting a strong coupling among the lattice, charge and spin in two-dimensional CrI3. Our study opens opportunities for tailoring light-matter interactions in two-dimensional magnetic semiconductors.

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Magnetic anisotropy of cubic iron-based diluted magnetic semiconductors

Physical Review B ◽

10.1103/physrevb.43.3443 ◽

1991 ◽

Vol 43 (4) ◽

pp. 3443-3449 ◽

Cited By ~ 25

Author(s):

Murielle Villeret ◽

Sergio Rodriguez ◽

E. Kartheuser

Keyword(s):

Magnetic Anisotropy ◽

Diluted Magnetic Semiconductors ◽

Magnetic Semiconductors ◽

Iron Based ◽

Diluted Magnetic

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Magnetic Anisotropy of Cubic Iron-Based Diluted Magnetic Semiconductors

Physica Scripta ◽

10.1088/0031-8949/1991/t39/019 ◽

1991 ◽

Vol T39 ◽

pp. 131-134 ◽

Cited By ~ 4

Author(s):

Sergio Rodriguez ◽

Murielle Villeret ◽

E Kartheuser

Keyword(s):

Magnetic Anisotropy ◽

Diluted Magnetic Semiconductors ◽

Magnetic Semiconductors ◽

Iron Based ◽

Diluted Magnetic

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Magnetic properties of iron-based diluted magnetic semiconductors

Solid State Communications ◽

10.1016/0038-1098(90)90150-a ◽

1990 ◽

Vol 75 (1) ◽

pp. 21-24 ◽

Cited By ~ 13

Author(s):

Murielle Villeret ◽

Sergio Rodriguez ◽

Edouard Kartheuser

Keyword(s):

Magnetic Properties ◽

Diluted Magnetic Semiconductors ◽

Magnetic Semiconductors ◽

Iron Based ◽

Diluted Magnetic

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Magnetization steps in iron-based diluted magnetic semiconductors

Physical Review B ◽

10.1103/physrevb.41.7330 ◽

1990 ◽

Vol 41 (10) ◽

pp. 7330-7333 ◽

Cited By ~ 22

Author(s):

H. J. M. Swagten ◽

C. E. P. Gerrits ◽

A. Twardowski ◽

W. J. M. de Jonge

Keyword(s):

Diluted Magnetic Semiconductors ◽

Magnetic Semiconductors ◽

Iron Based ◽

Diluted Magnetic

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A CaAl 2 Si 2 -Type Magnetic Semiconductor (Sr, Na)(Zn, Mn)2Sb2 Isostructural to 122-Type Iron-Based Superconductors

Advances in Condensed Matter Physics ◽

10.1155/2022/4291923 ◽

2022 ◽

Vol 2022 ◽

pp. 1-7

Author(s):

Yilun Gu ◽

Rufei Zhang ◽

Haojie Zhang ◽

Licheng Fu ◽

Guoxiang Zhi ◽

...

Keyword(s):

Curie Temperature ◽

Diluted Magnetic Semiconductors ◽

Magnetic Semiconductors ◽

Diluted Magnetic Semiconductor ◽

Parent Compound ◽

Magnetic Semiconductor ◽

Magnetic Ordering ◽

Iron Based ◽

Diluted Magnetic ◽

Formula Type

A new diluted magnetic semiconductor (Sr, Na)(Zn, Mn)2Sb2 has been successfully synthesized by doping Na and Mn into the parent compound SrZn 2 Sb 2 , which has a CaAl 2 Si 2 -type crystal structure (space group P 3 ¯ m 1 , No. 164, h P 5 ) isostructural to the 122-type iron-based superconductor CaFe 2 As 2 . No magnetic ordering has been observed when only spins are doped by (Zn, Mn) substitution. Only with carriers codoped by (Sr, Na) substitution, a ferromagnetic ordering occurs below the maximum Curie temperature T C ∼9.5 K. Comparing with other CaAl 2 Si 2 -type diluted magnetic semiconductors, we will show that negative chemical pressure suppresses the Curie temperature.

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