AlB2-type metal diborides represented by MgB2 become an important type of conventional superconductors. However, AlB2-type HfB2 is not superconductive. Pressure-induced HfH10 are predicted to be high-temperature superconductors. Here, first-principles swarm-intelligence structural search calculations identified two ternary compounds, HfBH2 and HfB2H, showing superconductivity with the predicted superconducting transition temperatures of 2.1–14.9 and 2.2–15.0 K for a wide range of Coulomb pseudopotential μ* = 0.15–0.05 at 300 GPa, respectively. The two compounds exhibit interesting structural features, such as an Hf–H layer, covalent B–H framework, and graphene-type boron layer, as observed in AlB2-type HfB2. Besides atomic hydrogen and covalent skeleton contributing to superconducting transition, H-activated hafnium also plays a certain role.
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21 October 2021
Research Article|
October 20 2021
Theoretical considerations of superconducting HfBH2 and HfB2H under high pressure
Special Collection:
Phenomena of Hydrides
Yaping Zhao
;
Yaping Zhao
1
State Key Laboratory of Metastable Materials Science and Technology and Key Laboratory for Microstructural Material Physics of Hebei Province, School of Science, Yanshan University
, Qinhuangdao 066004, China
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Xiaohua Zhang
;
Xiaohua Zhang
1
State Key Laboratory of Metastable Materials Science and Technology and Key Laboratory for Microstructural Material Physics of Hebei Province, School of Science, Yanshan University
, Qinhuangdao 066004, China
2
Centre for Advanced Optoelectronic Functional Materials Research and Key Laboratory for UV Light-Emitting Materials and Technology of Ministry of Education, Northeast Normal University
, Changchun 130024, China
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Yong Liu
;
Yong Liu
a)
1
State Key Laboratory of Metastable Materials Science and Technology and Key Laboratory for Microstructural Material Physics of Hebei Province, School of Science, Yanshan University
, Qinhuangdao 066004, China
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Guochun Yang
Guochun Yang
a)
1
State Key Laboratory of Metastable Materials Science and Technology and Key Laboratory for Microstructural Material Physics of Hebei Province, School of Science, Yanshan University
, Qinhuangdao 066004, China
2
Centre for Advanced Optoelectronic Functional Materials Research and Key Laboratory for UV Light-Emitting Materials and Technology of Ministry of Education, Northeast Normal University
, Changchun 130024, China
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Yaping Zhao
1
Xiaohua Zhang
1,2
Yong Liu
1,a)
Guochun Yang
1,2,a)
1
State Key Laboratory of Metastable Materials Science and Technology and Key Laboratory for Microstructural Material Physics of Hebei Province, School of Science, Yanshan University
, Qinhuangdao 066004, China
2
Centre for Advanced Optoelectronic Functional Materials Research and Key Laboratory for UV Light-Emitting Materials and Technology of Ministry of Education, Northeast Normal University
, Changchun 130024, China
Note: This paper is part of the Special Topic on Phenomena of Hydrides.
J. Appl. Phys. 130, 153904 (2021)
Article history
Received:
July 19 2021
Accepted:
October 03 2021
Citation
Yaping Zhao, Xiaohua Zhang, Yong Liu, Guochun Yang; Theoretical considerations of superconducting HfBH2 and HfB2H under high pressure. J. Appl. Phys. 21 October 2021; 130 (15): 153904. https://doi.org/10.1063/5.0064011
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