Identifying the structure of La3Ni2O7 in the pressurized superconducting state Article Swipe
Zhang Hengyuan
,
Zhang Jie-long
,
Huo, Mengwu
,
Chen Junfeng
,
HU Deyuan
,
Yao, Dao-Xin
,
Sun, Hualei
,
Cao Kun
,
Wang Meng
·
YOU?
·
· 2025
· Open Access
·
· DOI: https://doi.org/10.48550/arxiv.2511.15265
YOU?
·
· 2025
· Open Access
·
· DOI: https://doi.org/10.48550/arxiv.2511.15265
The precise crystal structure of La3Ni2O7 in its high-pressure superconducting state has been a subject of intense debate, with proposed models including both orthorhombic and tetragonal symmetries. Using high-pressure Raman spectroscopy combined with frst-principles calculations, we unravel the structural evolution of La3Ni2O7 under pressure up to 32.7 GPa. We identify a clear structural transition sequence: from the orthorhombic Amam phase to a mixed Amam+Fmmm phase at 4 GPa, followed by a complete transition to the tetragonal I4/mmm phase at 14.5 GPa, which is signaled by a pronounced phonon renormalization. The emergence of bulk superconductivity is found to coincide precisely with this transition to the I4/mmm phase. Our results de nitively establish the tetragonal I4/mmm structure as the host of superconductivity in La3Ni2O7, resolving a central controversy and providing a critical foundation for understanding the superconducting mechanism in nickelates.
Related Topics
Concepts
Tetragonal crystal system
Superconductivity
Orthorhombic crystal system
Condensed matter physics
Raman spectroscopy
Phase (matter)
Phase transition
Crystal structure
Materials science
Phonon
State (computer science)
Crystal (programming language)
High-temperature superconductivity
Physics
Crystallography
Metadata
- Type
- preprint
- Landing Page
- https://doi.org/10.48550/arxiv.2511.15265
- OA Status
- green
- OpenAlex ID
- https://openalex.org/W7106274328
All OpenAlex metadata
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https://openalex.org/W7106274328Canonical identifier for this work in OpenAlex
- DOI
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https://doi.org/10.48550/arxiv.2511.15265Digital Object Identifier
- Title
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Identifying the structure of La3Ni2O7 in the pressurized superconducting stateWork title
- Type
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preprintOpenAlex work type
- Publication year
-
2025Year of publication
- Publication date
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2025-11-19Full publication date if available
- Authors
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Zhang Hengyuan, Zhang Jie-long, Huo, Mengwu, Chen Junfeng, HU Deyuan, Yao, Dao-Xin, Sun, Hualei, Cao Kun, Wang MengList of authors in order
- Landing page
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https://doi.org/10.48550/arxiv.2511.15265Publisher landing page
- Open access
-
YesWhether a free full text is available
- OA status
-
greenOpen access status per OpenAlex
- OA URL
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https://doi.org/10.48550/arxiv.2511.15265Direct OA link when available
- Concepts
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Tetragonal crystal system, Superconductivity, Orthorhombic crystal system, Condensed matter physics, Raman spectroscopy, Phase (matter), Phase transition, Crystal structure, Materials science, Phonon, State (computer science), Crystal (programming language), High-temperature superconductivity, Physics, CrystallographyTop concepts (fields/topics) attached by OpenAlex
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0Total citation count in OpenAlex
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