Impersonating a Superconductor: High-Pressure BaCoO3, an Insulating Ferromagnet

Haozhe Wang; Xianghan Xu; Danrui Ni; David Walker; Jie Li; Robert J. Cava; Weiwei Xie

doi:10.1021/jacs.3c08726

Impersonating a Superconductor: High-Pressure BaCoO₃, an Insulating Ferromagnet

Haozhe Wang, Xianghan Xu, Danrui Ni, David Walker, Jie Li, Robert J. Cava, Weiwei Xie

Research output: Contribution to journal › Article › peer-review

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Abstract

We report the high-pressure synthesis (6 GPa, 1200 °C) and ambient-pressure characterization of hexagonal HP-BaCoO₃. The material (with a 2H crystal structure) has a short intrachain Co-Co distance of about 2.07 Å. Our magnetization investigation revealed robust diamagnetic behavior below approximately 130 K when the material was exposed to weak applied magnetic fields (10 Oe) and a distinct “half-levitation” phenomenon below that temperature, as is often observed for superconductors. Its field-dependent magnetization profile, however, unveils the characteristics of ferromagnetism, marked by a substantial magnetic retentivity of 0.22(1) μ_B/Co at a temperature of 2 K. Electrical resistivity measurements indicate that HP-BaCoO₃ is a ferromagnetic insulator, not a superconductor.

Original language	English (US)
Pages (from-to)	21203-21206
Number of pages	4
Journal	Journal of the American Chemical Society
Volume	145
Issue number	39
DOIs	https://doi.org/10.1021/jacs.3c08726
State	Published - Oct 4 2023

All Science Journal Classification (ASJC) codes

General Chemistry
Biochemistry
Catalysis
Colloid and Surface Chemistry

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title = "Impersonating a Superconductor: High-Pressure BaCoO3, an Insulating Ferromagnet",

abstract = "We report the high-pressure synthesis (6 GPa, 1200 °C) and ambient-pressure characterization of hexagonal HP-BaCoO3. The material (with a 2H crystal structure) has a short intrachain Co-Co distance of about 2.07 {\AA}. Our magnetization investigation revealed robust diamagnetic behavior below approximately 130 K when the material was exposed to weak applied magnetic fields (10 Oe) and a distinct “half-levitation” phenomenon below that temperature, as is often observed for superconductors. Its field-dependent magnetization profile, however, unveils the characteristics of ferromagnetism, marked by a substantial magnetic retentivity of 0.22(1) μB/Co at a temperature of 2 K. Electrical resistivity measurements indicate that HP-BaCoO3 is a ferromagnetic insulator, not a superconductor.",

author = "Haozhe Wang and Xianghan Xu and Danrui Ni and David Walker and Jie Li and Cava, {Robert J.} and Weiwei Xie",

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T1 - Impersonating a Superconductor

T2 - High-Pressure BaCoO3, an Insulating Ferromagnet

AU - Wang, Haozhe

AU - Xu, Xianghan

AU - Ni, Danrui

AU - Walker, David

AU - Li, Jie

AU - Cava, Robert J.

AU - Xie, Weiwei

PY - 2023/10/4

Y1 - 2023/10/4

N2 - We report the high-pressure synthesis (6 GPa, 1200 °C) and ambient-pressure characterization of hexagonal HP-BaCoO3. The material (with a 2H crystal structure) has a short intrachain Co-Co distance of about 2.07 Å. Our magnetization investigation revealed robust diamagnetic behavior below approximately 130 K when the material was exposed to weak applied magnetic fields (10 Oe) and a distinct “half-levitation” phenomenon below that temperature, as is often observed for superconductors. Its field-dependent magnetization profile, however, unveils the characteristics of ferromagnetism, marked by a substantial magnetic retentivity of 0.22(1) μB/Co at a temperature of 2 K. Electrical resistivity measurements indicate that HP-BaCoO3 is a ferromagnetic insulator, not a superconductor.

AB - We report the high-pressure synthesis (6 GPa, 1200 °C) and ambient-pressure characterization of hexagonal HP-BaCoO3. The material (with a 2H crystal structure) has a short intrachain Co-Co distance of about 2.07 Å. Our magnetization investigation revealed robust diamagnetic behavior below approximately 130 K when the material was exposed to weak applied magnetic fields (10 Oe) and a distinct “half-levitation” phenomenon below that temperature, as is often observed for superconductors. Its field-dependent magnetization profile, however, unveils the characteristics of ferromagnetism, marked by a substantial magnetic retentivity of 0.22(1) μB/Co at a temperature of 2 K. Electrical resistivity measurements indicate that HP-BaCoO3 is a ferromagnetic insulator, not a superconductor.

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Impersonating a Superconductor: High-Pressure BaCoO₃, an Insulating Ferromagnet

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