Drastic improvement of Curie temperature by chemical pressure in N-type diluted magnetic semiconductor Ba(Zn,Co) $$_{2}$$ 2 As $$_{2}$$ 2
Abstract We report the effect of chemical pressure on the ferromagnetic ordering of the recently reported n-type diluted magnetic semiconductor Ba(Zn $$_{1-x}$$ 1 - x Co $$_{x}$$ x ) $$_{2}$$ 2 As $$_{2}$$ 2 which has a maximum $$T_C$$ T C $$\sim$$ ∼ 45 K. Doping Sb into As-site and Sr into Ba-site...
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| Autores principales: | , , , , , , , , |
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| Formato: | article |
| Lenguaje: | EN |
| Publicado: |
Nature Portfolio
2021
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| Materias: | |
| Acceso en línea: | https://doaj.org/article/127f24fa5e8d408e9481f1573a7237ed |
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| Sumario: | Abstract We report the effect of chemical pressure on the ferromagnetic ordering of the recently reported n-type diluted magnetic semiconductor Ba(Zn $$_{1-x}$$ 1 - x Co $$_{x}$$ x ) $$_{2}$$ 2 As $$_{2}$$ 2 which has a maximum $$T_C$$ T C $$\sim$$ ∼ 45 K. Doping Sb into As-site and Sr into Ba-site induces negative and positive chemical pressure, respectively. While conserving the tetragonal crystal structure and n-type carriers, the unit cell volume shrink by $$\sim$$ ∼ 0.3 $$\%$$ % with 15 $$\%$$ % Sr doping, but drastically increase the ferromagnetic transition temperature by 18 $$\%$$ % to 53 K. Our experiment unequivocally demonstrate that the parameters of Zn(Co)As $$_{4}$$ 4 tetrahedra play a vital role in the formation of ferromagnetic ordering in the Ba(Zn,Co) $$_{2}$$ 2 As $$_{2}$$ 2 DMS. |
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