Probing the pathway of an ultrafast structural phase transition to illuminate the transition mechanism in Cu2S
- Brookhaven National Lab. (BNL), Upton, NY (United States). Condensed Matter Physics and Materials Science Department
- Univ. of Michigan, Ann Arbor, MI (United States). Department of Physics
- Brookhaven National Lab. (BNL), Upton, NY (United States). Center for Functional Nanomaterials
- American Physical Society, Ridge, NY (United States)
- Brookhaven National Lab. (BNL), Upton, NY (United States). Accelerator Test Facility
- Univ. of Arkansas, Fayetteville, AR (United States). Department of Chemistry and Biochemistry
- Princeton Univ., NJ (United States). Department of Chemistry
Disentangling the primary order parameter from secondary order parameters in phase transitions is critical to the interpretation of transition mechanisms in strongly correlated systems and quantum materials. Here, we present a study of structural phase transition pathways in superionic Cu2S nanocrystals that exhibit intriguing properties. Utilizing ultrafast electron diffraction techniques sensitive to both the momentum-space and the time-domain, we distinguish the dynamics of crystal symmetry breaking and lattice expansion in this system. We are able to follow the transient states along the transition pathway, and so observe the dynamics of both the primary and secondary order parameters. Based on these observations, we argue that the mechanism of structural phase transition in Cu2S is dominated by the electron-phonon coupling. This mechanism advances the understanding from previous results, where the focus was solely on dynamic observations of the lattice expansion. Published by AIP Publishing.
- Research Organization:
- Brookhaven National Laboratory (BNL), Upton, NY (United States); Princeton Univ., NJ (United States)
- Sponsoring Organization:
- USDOE Office of Science (SC), Basic Energy Sciences (BES); USDOE Office of Science (SC), High Energy Physics (HEP); National Science Foundation (NSF)
- Grant/Contract Number:
- SC0012704; FG02-98ER45706; NSF-EFMA-1741618; OIA-1457888
- OSTI ID:
- 1473656
- Alternate ID(s):
- OSTI ID: 1461568; OSTI ID: 1595079
- Report Number(s):
- BNL-209066-2018-JAAM
- Journal Information:
- Applied Physics Letters, Vol. 113, Issue 4; ISSN 0003-6951
- Publisher:
- American Institute of Physics (AIP)Copyright Statement
- Country of Publication:
- United States
- Language:
- English
Web of Science
A novel nondestructive diagnostic method for mega-electron-volt ultrafast electron diffraction
|
journal | November 2019 |
A Novel Nondestructive Diagnostic Method for Mega-Electron-Volt Ultrafast Electron Diffraction
|
text | January 2020 |
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