Creation, stabilization, and study at ambient pressure of pressure-induced superconductivity in Bi$_{0.5}$Sb$_{1.5}$Te$_3$
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arXiv
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| Format: | Preprint |
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2025
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| _version_ | 1866915135843467264 |
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| author | Deng, Liangzi Wang, Busheng Halbert, Clayton Schulze, Daniel J. Gooch, Melissa Bontke, Trevor Kuo, Ting-Wei Shi, Xin Song, Shaowei Salke, Nilesh Yang, Hung-Duen Ren, Zhifeng Hemley, Russell J. Zurek, Eva Prasankumar, Rohit P. Chu, Ching-Wu |
| author_facet | Deng, Liangzi Wang, Busheng Halbert, Clayton Schulze, Daniel J. Gooch, Melissa Bontke, Trevor Kuo, Ting-Wei Shi, Xin Song, Shaowei Salke, Nilesh Yang, Hung-Duen Ren, Zhifeng Hemley, Russell J. Zurek, Eva Prasankumar, Rohit P. Chu, Ching-Wu |
| contents | In light of breakthroughs in superconductivity under high pressure, and considering that record critical temperatures (T$_c$s) across various systems have been achieved under high pressure, the primary challenge for higher Tc should no longer solely be to increase T$_c$ under extreme conditions but also to reduce, or ideally eliminate, the need for applied pressure in retaining pressure-induced or -enhanced superconductivity. The topological semiconductor Bi$_{0.5}$Sb$_{1.5}$Te$_3$ (BST) was chosen to demonstrate our approach to addressing this challenge and exploring its intriguing physics. Under pressures up to ~ 50 GPa, three superconducting phases (BST-I, -II, and -III) were observed. A superconducting phase in BST-I appears at ~ 4 GPa, without a structural transition, suggesting the possible topological nature of this phase. Using the pressure-quench protocol (PQP) recently developed by us, we successfully retained this pressure-induced phase at ambient pressure and revealed the bulk nature of the state. Significantly, this demonstrates recovery of a pressure-quenched sample from a diamond anvil cell at room temperature with the pressure-induced phase retained at ambient pressure. Other superconducting phases were retained in BST-II and -III at ambient pressure and subjected to thermal and temporal stability testing. Superconductivity was also found in BST with T$_c$ up to 10.2 K, the record for this compound series. While PQP maintains superconducting phases in BST at ambient pressure, both depressurization and PQP enhance its T$_c$, possibly due to microstructures formed during these processes, offering an added avenue to raise T$_c$. These findings are supported by our density-functional theory calculations. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2502_01881 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | Creation, stabilization, and study at ambient pressure of pressure-induced superconductivity in Bi$_{0.5}$Sb$_{1.5}$Te$_3$ Deng, Liangzi Wang, Busheng Halbert, Clayton Schulze, Daniel J. Gooch, Melissa Bontke, Trevor Kuo, Ting-Wei Shi, Xin Song, Shaowei Salke, Nilesh Yang, Hung-Duen Ren, Zhifeng Hemley, Russell J. Zurek, Eva Prasankumar, Rohit P. Chu, Ching-Wu Superconductivity In light of breakthroughs in superconductivity under high pressure, and considering that record critical temperatures (T$_c$s) across various systems have been achieved under high pressure, the primary challenge for higher Tc should no longer solely be to increase T$_c$ under extreme conditions but also to reduce, or ideally eliminate, the need for applied pressure in retaining pressure-induced or -enhanced superconductivity. The topological semiconductor Bi$_{0.5}$Sb$_{1.5}$Te$_3$ (BST) was chosen to demonstrate our approach to addressing this challenge and exploring its intriguing physics. Under pressures up to ~ 50 GPa, three superconducting phases (BST-I, -II, and -III) were observed. A superconducting phase in BST-I appears at ~ 4 GPa, without a structural transition, suggesting the possible topological nature of this phase. Using the pressure-quench protocol (PQP) recently developed by us, we successfully retained this pressure-induced phase at ambient pressure and revealed the bulk nature of the state. Significantly, this demonstrates recovery of a pressure-quenched sample from a diamond anvil cell at room temperature with the pressure-induced phase retained at ambient pressure. Other superconducting phases were retained in BST-II and -III at ambient pressure and subjected to thermal and temporal stability testing. Superconductivity was also found in BST with T$_c$ up to 10.2 K, the record for this compound series. While PQP maintains superconducting phases in BST at ambient pressure, both depressurization and PQP enhance its T$_c$, possibly due to microstructures formed during these processes, offering an added avenue to raise T$_c$. These findings are supported by our density-functional theory calculations. |
| title | Creation, stabilization, and study at ambient pressure of pressure-induced superconductivity in Bi$_{0.5}$Sb$_{1.5}$Te$_3$ |
| topic | Superconductivity |
| url | https://arxiv.org/abs/2502.01881 |