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Title: Nano-Resolved Current-Induced Insulator-Metal Transition in the Mott Insulator Ca 2 RuO 4

Abstract

The Mott insulator Ca 2RuO 4 is the subject of much recent attention following reports of emergent nonequilibrium steady states driven by applied electric fields or currents. In this paper, we carry out infrared nano-imaging and optical-microscopy measurements on bulk single crystal Ca 2RuO 4 under conditions of steady current flow to obtain insight into the current-driven insulator-tometal transition. We observe macroscopic growth of the current-induced metallic phase, with nucleation regions for metal and insulator phases determined by the polarity of the current flow. A remarkable metal-insulator-metal microstripe pattern is observed at the phase front separating metal and insulator phases. The microstripes have orientations tied uniquely to the crystallographic axes, implying a strong coupling of the electronic transition to lattice degrees of freedom. Theoretical modeling further illustrates the importance of the current density and confirms a submicron-thick surface metallic layer at the phase front of the bulk metallic phase. Our work confirms that the electrically induced metallic phase is nonfilamentary and is not driven by Joule heating, revealing remarkable new characteristics of electrically induced insulator-metal transitions occurring in functional correlated oxides.

Authors:
 [1];  [2];  [2];  [1];  [3];  [1];  [1];  [1];  [4];  [5];  [6];  [3];  [7];  [7];  [8];  [9];  [2];  [10];  [7];  [1]
  1. Stony Brook Univ., NY (United States)
  2. Columbia Univ., New York, NY (United States)
  3. Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States)
  4. Chinese Academy of Sciences (CAS), Beijing (China)
  5. Texas A & M Univ., College Station, TX (United States)
  6. Brookhaven National Lab. (BNL), Upton, NY (United States)
  7. Kyoto Univ. (Japan)
  8. Kurume Inst. of Technology, Fukuoka (Japan)
  9. Nagoya Univ. (Japan)
  10. Columbia Univ., New York, NY (United States); The Flatiron Inst., New York, NY (United States)
Publication Date:
Research Org.:
Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States)
Sponsoring Org.:
USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22)
OSTI Identifier:
1496044
DOE Contract Number:  
AC02-05CH11231
Resource Type:
Journal Article
Journal Name:
Physical Review. X
Additional Journal Information:
Journal Volume: 9; Journal Issue: 1; Journal ID: ISSN 2160-3308
Publisher:
American Physical Society
Country of Publication:
United States
Language:
English
Subject:
75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY

Citation Formats

Zhang, Jiawei, McLeod, Alexander S., Han, Qiang, Chen, Xinzhong, Bechtel, Hans A., Yao, Ziheng, Gilbert Corder, S. N., Ciavatti, Thomas, Tao, Tiger H., Aronson, Meigan, Carr, G. L., Martin, Michael C., Sow, Chanchal, Yonezawa, Shingo, Nakamura, Fumihiko, Terasaki, Ichiro, Basov, D. N., Millis, Andrew J., Maeno, Yoshiteru, and Liu, Mengkun. Nano-Resolved Current-Induced Insulator-Metal Transition in the Mott Insulator Ca2RuO4. United States: N. p., 2019. Web. doi:10.1103/physrevx.9.011032.
Zhang, Jiawei, McLeod, Alexander S., Han, Qiang, Chen, Xinzhong, Bechtel, Hans A., Yao, Ziheng, Gilbert Corder, S. N., Ciavatti, Thomas, Tao, Tiger H., Aronson, Meigan, Carr, G. L., Martin, Michael C., Sow, Chanchal, Yonezawa, Shingo, Nakamura, Fumihiko, Terasaki, Ichiro, Basov, D. N., Millis, Andrew J., Maeno, Yoshiteru, & Liu, Mengkun. Nano-Resolved Current-Induced Insulator-Metal Transition in the Mott Insulator Ca2RuO4. United States. doi:10.1103/physrevx.9.011032.
Zhang, Jiawei, McLeod, Alexander S., Han, Qiang, Chen, Xinzhong, Bechtel, Hans A., Yao, Ziheng, Gilbert Corder, S. N., Ciavatti, Thomas, Tao, Tiger H., Aronson, Meigan, Carr, G. L., Martin, Michael C., Sow, Chanchal, Yonezawa, Shingo, Nakamura, Fumihiko, Terasaki, Ichiro, Basov, D. N., Millis, Andrew J., Maeno, Yoshiteru, and Liu, Mengkun. Fri . "Nano-Resolved Current-Induced Insulator-Metal Transition in the Mott Insulator Ca2RuO4". United States. doi:10.1103/physrevx.9.011032. https://www.osti.gov/servlets/purl/1496044.
@article{osti_1496044,
title = {Nano-Resolved Current-Induced Insulator-Metal Transition in the Mott Insulator Ca2RuO4},
author = {Zhang, Jiawei and McLeod, Alexander S. and Han, Qiang and Chen, Xinzhong and Bechtel, Hans A. and Yao, Ziheng and Gilbert Corder, S. N. and Ciavatti, Thomas and Tao, Tiger H. and Aronson, Meigan and Carr, G. L. and Martin, Michael C. and Sow, Chanchal and Yonezawa, Shingo and Nakamura, Fumihiko and Terasaki, Ichiro and Basov, D. N. and Millis, Andrew J. and Maeno, Yoshiteru and Liu, Mengkun},
abstractNote = {The Mott insulator Ca2RuO4 is the subject of much recent attention following reports of emergent nonequilibrium steady states driven by applied electric fields or currents. In this paper, we carry out infrared nano-imaging and optical-microscopy measurements on bulk single crystal Ca2RuO4 under conditions of steady current flow to obtain insight into the current-driven insulator-tometal transition. We observe macroscopic growth of the current-induced metallic phase, with nucleation regions for metal and insulator phases determined by the polarity of the current flow. A remarkable metal-insulator-metal microstripe pattern is observed at the phase front separating metal and insulator phases. The microstripes have orientations tied uniquely to the crystallographic axes, implying a strong coupling of the electronic transition to lattice degrees of freedom. Theoretical modeling further illustrates the importance of the current density and confirms a submicron-thick surface metallic layer at the phase front of the bulk metallic phase. Our work confirms that the electrically induced metallic phase is nonfilamentary and is not driven by Joule heating, revealing remarkable new characteristics of electrically induced insulator-metal transitions occurring in functional correlated oxides.},
doi = {10.1103/physrevx.9.011032},
journal = {Physical Review. X},
issn = {2160-3308},
number = 1,
volume = 9,
place = {United States},
year = {2019},
month = {2}
}

Journal Article:

Figures / Tables:

FIG. 1 FIG. 1: dc transport characterization and optical photographs of a Ca2RuO4 bulk single crystal at different stages of the IMT. (a) A dc I-V curve with optical images taken by a CCD camera in the visible range. The insets show the emergence and expansion of the L phase (dark region)more » at each stage of the phase transition. The white dashed line in the bottom inset outlines the silver paint electrodes on the sample surface. (b) and (c) show the switching of the L phase from the right to left electrode via reversing the polarity of the two electrodes (outlined by the white dashed lines).« less

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Works referenced in this record:

Destruction of the Mott insulating ground state of Ca 2 RuO 4 by a structural transition
journal, September 1999


Dielectric breakdown and current switching effect in the incommensurate layered compound ( La S ) 1.196 V S 2
journal, April 2006


Electric-field-induced metal maintained by current of the Mott insulator Ca2RuO4
journal, August 2013

  • Nakamura, Fumihiko; Sakaki, Mariko; Yamanaka, Yuya
  • Scientific Reports, Vol. 3, Issue 1
  • DOI: 10.1038/srep02536

Internal strain tunes electronic correlations on the nanoscale
journal, December 2018


A mesophase transition in a binary monolayer on a solid surface
journal, May 2002


Epitaxial strain effect on transport properties in Ca 2 x Sr x RuO 4 thin films
journal, September 2013


Near-field spectroscopy of silicon dioxide thin films
journal, February 2012


Spin-Orbit Coupling in the Mott Insulator Ca 2 RuO 4
journal, July 2001


Ca 2 RuO 4 : New Mott Insulators of Layered Ruthenate
journal, July 1997

  • Nakatsuji, Satoru; Ikeda, Shin-ichi; Maeno, Yoshiteru
  • Journal of the Physical Society of Japan, Vol. 66, Issue 7
  • DOI: 10.1143/JPSJ.66.1868

Structural and magnetic aspects of the metal-insulator transition in Ca 2 x Sr x RuO 4
journal, April 2001


Complexity in Strongly Correlated Electronic Systems
journal, July 2005


Current-induced strong diamagnetism in the Mott insulator Ca 2 RuO 4
journal, November 2017


Nature of the Mott Transition in Ca 2 RuO 4
journal, June 2010


Recovery of Permittivity and Depth from Near-Field Data as a Step toward Infrared Nanotomography
journal, June 2014

  • Govyadinov, Alexander A.; Mastel, Stefan; Golmar, Federico
  • ACS Nano, Vol. 8, Issue 7
  • DOI: 10.1021/nn5016314

A Surface-Tailored, Purely Electronic, Mott Metal-to-Insulator Transition
journal, October 2007


Phase transition in bulk single crystals and thin films of V O 2 by nanoscale infrared spectroscopy and imaging
journal, June 2015


Electric-Pulse-driven Electronic Phase Separation, Insulator-Metal Transition, and Possible Superconductivity in a Mott Insulator
journal, July 2008

  • Vaju, Cristian; Cario, Laurent; Corraze, Benoit
  • Advanced Materials, Vol. 20, Issue 14
  • DOI: 10.1002/adma.200702967

Extended Mapping and Exploration of the Vanadium Dioxide Stress-Temperature Phase Diagram
journal, July 2010


Cooperative photoinduced metastable phase control in strained manganite films
journal, July 2016

  • Zhang, Jingdi; Tan, Xuelian; Liu, Mengkun
  • Nature Materials, Vol. 15, Issue 9
  • DOI: 10.1038/nmat4695

Resistive Switching at the Nanoscale in the Mott Insulator Compound GaTa 4 Se 8
journal, July 2013

  • Dubost, Vincent; Cren, Tristan; Vaju, Cristian
  • Nano Letters, Vol. 13, Issue 8
  • DOI: 10.1021/nl401510p

Nanoscale electrodynamics of strongly correlated quantum materials
journal, November 2016


Ultrabroadband infrared nanospectroscopic imaging
journal, May 2014

  • Bechtel, H. A.; Muller, E. A.; Olmon, R. L.
  • Proceedings of the National Academy of Sciences, Vol. 111, Issue 20
  • DOI: 10.1073/pnas.1400502111

Spin-orbit-induced orbital excitations in Sr 2 RuO 4 and Ca 2 RuO 4 : A resonant inelastic x-ray scattering study
journal, April 2015


From Mott insulator to ferromagnetic metal: A pressure study of Ca 2 RuO 4
journal, May 2002


Enhanced metal–insulator transition in V2O3 by thermal quenching after growth
journal, March 2018


Atomic-scale electronic structure of the cuprate d-symmetry form factor density wave state
journal, October 2015

  • Hamidian, M. H.; Edkins, S. D.; Kim, Chung Koo
  • Nature Physics, Vol. 12, Issue 2
  • DOI: 10.1038/nphys3519

Geometric constraints on phase coexistence in vanadium dioxide single crystals
journal, January 2017


Crystal and magnetic structure of Ca 2 RuO 4 : Magnetoelastic coupling and the metal-insulator transition
journal, July 1998


Lattice Energetics and Correlation-Driven Metal-Insulator Transitions: The Case of Ca 2 RuO 4
journal, August 2018


Surface lattice dynamics of layered transition metal oxides: Sr 2 RuO 4 and La 0.5 Sr 1.5 MnO 4
journal, January 2003


Avalanche breakdown in GaTa4Se8−xTex narrow-gap Mott insulators
journal, April 2013

  • Guiot, V.; Cario, L.; Janod, E.
  • Nature Communications, Vol. 4, Issue 1
  • DOI: 10.1038/ncomms2735

Mott Transition in VO2 Revealed by Infrared Spectroscopy and Nano-Imaging
journal, December 2007


A fast, high-endurance and scalable non-volatile memory device made from asymmetric Ta2O5−x/TaO2−x bilayer structures
journal, July 2011

  • Lee, Myoung-Jae; Lee, Chang Bum; Lee, Dongsoo
  • Nature Materials, Vol. 10, Issue 8, p. 625-630
  • DOI: 10.1038/nmat3070

Dielectric breakdown of one-dimensional Mott insulators Sr 2 CuO 3 and SrCuO 2
journal, September 2000


In situ strain tuning of the metal-insulator-transition of Ca2RuO4 in angle-resolved photoemission experiments
journal, October 2018


Current-Induced Gap Suppression in the Mott Insulator Ca 2 RuO 4
journal, October 2013

  • Okazaki, Ryuji; Nishina, Yasuo; Yasui, Yukio
  • Journal of the Physical Society of Japan, Vol. 82, Issue 10
  • DOI: 10.7566/JPSJ.82.103702

Electric-Field-Induced Insulator–Metal Transition in Ca 2 RuO 4 Probed by X-ray Absorption and Emission Spectroscopy
journal, September 2013

  • Sakaki, Mariko; Nakajima, Nobuo; Nakamura, Fumihiko
  • Journal of the Physical Society of Japan, Vol. 82, Issue 9
  • DOI: 10.7566/JPSJ.82.093707

Atomic structure of conducting nanofilaments in TiO2 resistive switching memory
journal, January 2010

  • Kwon, Deok-Hwang; Kim, Kyung Min; Jang, Jae Hyuck
  • Nature Nanotechnology, Vol. 5, Issue 2
  • DOI: 10.1038/nnano.2009.456

Electric field induced avalanche breakdown and non-volatile resistive switching in the Mott Insulators AM4Q8
journal, July 2013


Nanotextured phase coexistence in the correlated insulator V2O3
journal, September 2016

  • McLeod, A. S.; van Heumen, E.; Ramirez, J. G.
  • Nature Physics, Vol. 13, Issue 1
  • DOI: 10.1038/nphys3882

High-pressure diffraction studies on Ca 2 RuO 4
journal, September 2005


Dielectric Breakdown of the Insulating Charge-Ordered State in La 2 x Sr x NiO 4
journal, December 1999


Strain-Induced Self Organization of Metal−Insulator Domains in Single-Crystalline VO 2 Nanobeams
journal, October 2006

  • Wu, Junqiao; Gu, Qian; Guiton, Beth S.
  • Nano Letters, Vol. 6, Issue 10
  • DOI: 10.1021/nl061831r

    Works referencing / citing this record:

    Direct Visualization of Spatial Inhomogeneity of Spin Stripes Order in La1.72Sr0.28NiO4
    journal, August 2019


      Figures/Tables have been extracted from DOE-funded journal article accepted manuscripts.