Probing the pathway of an ultrafast structural phase transition to illuminate the transition mechanism in Cu2S

被引:11
|
作者
Li, Junjie [1 ]
Sun, Kai [2 ]
Li, Jun [1 ]
Meng, Qingping [1 ]
Fu, Xuewen [1 ]
Yin, Wei-Guo [1 ]
Lu, Deyu [3 ]
Li, Yan [4 ]
Babzien, Marcus [5 ]
Fedurin, Mikhail [5 ]
Swinson, Christina [5 ]
Malone, Robert [5 ]
Palmer, Mark [5 ]
Mathurin, Leanne [6 ]
Mason, Ryan [6 ]
Chen, Jingyi [6 ]
Konik, Robert M. [1 ]
Cava, Robert J. [7 ]
Zhu, Yimei [1 ]
Tao, Jing [1 ]
机构
[1] Brookhaven Natl Lab, Condensed Matter Phys & Mat Sci Dept, Upton, NY 11973 USA
[2] Univ Michigan, Dept Phys, Ann Arbor, MI 48109 USA
[3] Brookhaven Natl Lab, Ctr Funct Nanomat, Upton, NY 11973 USA
[4] Amer Phys Soc, 1 Res Rd, New York, NY 11961 USA
[5] Brookhaven Natl Lab, Accelerator Test Facil, Upton, NY 11973 USA
[6] Univ Arkansas, Dept Chem & Biochem, Fayetteville, AR 72701 USA
[7] Princeton Univ, Dept Chem, Princeton, NJ 08544 USA
基金
美国国家科学基金会;
关键词
SECONDARY ORDER PARAMETERS; ELECTRON-DIFFRACTION; COPPER; GENERATION; PHONONS; SULFIDE; LANDAU;
D O I
10.1063/1.5032132
中图分类号
O59 [应用物理学];
学科分类号
摘要
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.
引用
收藏
页数:5
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