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Title: Nonequilibrium Phase Precursors during a Photoexcited Insulator-to-Metal Transition in V 2 O 3

Abstract

Here, we photoinduce and directly observe with x-ray scattering an ultrafast enhancement of the structural long-range order in the archetypal Mott system V 2O 3. Despite the ultrafast increase in crystal symmetry, the change of unit cell volume occurs an order of magnitude slower and coincides with the insulator-to-metal transition. The decoupling between the two structural responses in the time domain highlights the existence of a transient photoinduced precursor phase, which is distinct from the two structural phases present in equilibrium. X-ray nanoscopy reveals that acoustic phonons trapped in nanoscale twin domains govern the dynamics of the ultrafast transition into the precursor phase, while nucleation and growth of metallic domains dictate the duration of the slower transition into the metallic phase. In conclusion, the enhancement of the long-range order before completion of the electronic transition demonstrates the critical role the nonequilibrium structural phases play during electronic phase transitions in correlated electrons systems.

Authors:
 [1];  [2];  [1];  [1];  [1];  [3];  [1];  [1];  [4];  [4];  [4];  [5];  [1];  [1]
  1. Univ. of California, San Diego, CA (United States). Dept. of Physics and Center for Advanced Nanoscience
  2. Univ. de los Andes, Bogota (Columbia). Dept. of Physics
  3. Univ. of California, San Diego, CA (United States). Dept. of Physics and Center for Advanced Nanoscience; Univ. of California, San Diego, CA (United States). Center for Memory and Recording Research
  4. SLAC National Accelerator Lab., Menlo Park, CA (United States)
  5. Argonne National Lab. (ANL), Argonne, IL (United States). Center for Nanoscale Materials
Publication Date:
Research Org.:
SLAC National Accelerator Lab., Menlo Park, CA (United States); Argonne National Lab. (ANL), Argonne, IL (United States)
Sponsoring Org.:
USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22); US Air Force Office of Scientific Research (AFOSR)
OSTI Identifier:
1458468
Alternate Identifier(s):
OSTI ID: 1437073; OSTI ID: 1461498
Grant/Contract Number:  
FA9550-16-1-0026; MRPI MR-15-328-528; SC0001805; FG02-87ER45332; AC02-76SF00515; AC02-06CH11357; 120471250659; 120424054303
Resource Type:
Accepted Manuscript
Journal Name:
Physical Review Letters
Additional Journal Information:
Journal Volume: 120; Journal Issue: 20; Journal ID: ISSN 0031-9007
Publisher:
American Physical Society (APS)
Country of Publication:
United States
Language:
English
Subject:
75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY

Citation Formats

Singer, Andrej, Ramirez, Juan Gabriel, Valmianski, Ilya, Cela, Devin, Hua, Nelson, Kukreja, Roopali, Wingert, James, Kovalchuk, Olesya, Glownia, James M., Sikorski, Marcin, Chollet, Matthieu, Holt, Martin, Schuller, Ivan K., and Shpyrko, Oleg G. Nonequilibrium Phase Precursors during a Photoexcited Insulator-to-Metal Transition in V2O3. United States: N. p., 2018. Web. doi:10.1103/physrevlett.120.207601.
Singer, Andrej, Ramirez, Juan Gabriel, Valmianski, Ilya, Cela, Devin, Hua, Nelson, Kukreja, Roopali, Wingert, James, Kovalchuk, Olesya, Glownia, James M., Sikorski, Marcin, Chollet, Matthieu, Holt, Martin, Schuller, Ivan K., & Shpyrko, Oleg G. Nonequilibrium Phase Precursors during a Photoexcited Insulator-to-Metal Transition in V2O3. United States. doi:10.1103/physrevlett.120.207601.
Singer, Andrej, Ramirez, Juan Gabriel, Valmianski, Ilya, Cela, Devin, Hua, Nelson, Kukreja, Roopali, Wingert, James, Kovalchuk, Olesya, Glownia, James M., Sikorski, Marcin, Chollet, Matthieu, Holt, Martin, Schuller, Ivan K., and Shpyrko, Oleg G. Mon . "Nonequilibrium Phase Precursors during a Photoexcited Insulator-to-Metal Transition in V2O3". United States. doi:10.1103/physrevlett.120.207601. https://www.osti.gov/servlets/purl/1458468.
@article{osti_1458468,
title = {Nonequilibrium Phase Precursors during a Photoexcited Insulator-to-Metal Transition in V2O3},
author = {Singer, Andrej and Ramirez, Juan Gabriel and Valmianski, Ilya and Cela, Devin and Hua, Nelson and Kukreja, Roopali and Wingert, James and Kovalchuk, Olesya and Glownia, James M. and Sikorski, Marcin and Chollet, Matthieu and Holt, Martin and Schuller, Ivan K. and Shpyrko, Oleg G.},
abstractNote = {Here, we photoinduce and directly observe with x-ray scattering an ultrafast enhancement of the structural long-range order in the archetypal Mott system V2O3. Despite the ultrafast increase in crystal symmetry, the change of unit cell volume occurs an order of magnitude slower and coincides with the insulator-to-metal transition. The decoupling between the two structural responses in the time domain highlights the existence of a transient photoinduced precursor phase, which is distinct from the two structural phases present in equilibrium. X-ray nanoscopy reveals that acoustic phonons trapped in nanoscale twin domains govern the dynamics of the ultrafast transition into the precursor phase, while nucleation and growth of metallic domains dictate the duration of the slower transition into the metallic phase. In conclusion, the enhancement of the long-range order before completion of the electronic transition demonstrates the critical role the nonequilibrium structural phases play during electronic phase transitions in correlated electrons systems.},
doi = {10.1103/physrevlett.120.207601},
journal = {Physical Review Letters},
number = 20,
volume = 120,
place = {United States},
year = {2018},
month = {5}
}

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Cited by: 6 works
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Figures / Tables:

FIG. 1 FIG. 1: Temperature induced and photoinduced structural phase transition. (a) The monoclinic insulating and rhombohedral metallic structures. The hexagon corners represent vanadium atoms. Oxygen, other vanadium atoms, and distortions of the hexagon within the shown structures are omitted for better visibility. (b) Schematic phase diagram of two equilibrium LT andmore » HT phases and the photoexcited (PE) phase. In equilibrium, the transition occurs directly from LT to HT, while photoinduced transition occurs via a transient, nonequilibrium phase. (c),(d) The peak intensity of the HT, (024)Rh diffraction peak (c) and of the LT, (022)Mon diffraction peak (d) as a function of the time delay after photoexcitation (pump fluence 1 mJ=cm2) at a base temperature of 157 K. Inset in (c) A slice through the 3D diffracted intensity around both peaks (linear scale). q is parallel to (024)Rh and q|| to ($\bar{2}10$)Rh. Scale bar shows 0.04 Å−1. The uncertainties in (c),(d) result from the difference between two independent measurements.« less

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