Growth of metallic delafossite PdCoO2 by molecular beam epitaxy

Brahlek, Matthew; Rimal, Gaurab; Ok, Jong Mok; Mukherjee, Debangshu; Mazza, Alessandro R.; Lu, Qiyang; Lee, Ho Nyung; Ward, T. Zac; Unocic, Raymond R.; Eres, Gyula; Oh, Seongshik

doi:10.1103/PhysRevMaterials.3.093401

Title: Growth of metallic delafossite $PdCo O_{2}$ by molecular beam epitaxy

Abstract

The Pd- and Pt-based ABO₂ delafossites are a novel class of layered, triangular oxides with two-dimensional electronic structure and a large conductivity that rivals the noble metals. In this work, we report successful growth of the metallic delafossite PdCoO₂ by molecular beam epitaxy (MBE). The key challenge is controlling the oxidation of Pd in the MBE environment where phase segregation is driven by the reduction of PdCoO₂ to cobalt oxide and metallic palladium. This is overcome by combining low-temperature (300 °C) atomic layer-by-layer MBE growth in the presence of reactive atomic oxygen with a postgrowth high-temperature anneal. Thickness dependence (5–265 nm) reveals that in the thin regime (<75 nm), the resistivity scales inversely with thickness, likely dominated by surface scattering; for thicker films, the resistivity approaches the values reported for the best bulk crystals at room temperature, but the low-temperature resistivity is limited by structural twins. Our report shows that the combination of MBE growth and a postgrowth anneal provides a route to creating high-quality films in this interesting family of layered, triangular oxides.

Authors:

^[1]; Rimal, Gaurab ^[2];

^[1];

^[1]; Oh, Seongshik ^[2]

Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
Rutgers Univ., Piscataway, NJ (United States)

Publication Date:: 2019-09-03

Research Org.:: Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)

Sponsoring Org.:: USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22). Materials Sciences & Engineering Division; USDOE

OSTI Identifier:: 1561648

Alternate Identifier(s):: OSTI ID: 1560305

Grant/Contract Number:: AC05-00OR22725

Resource Type:: Accepted Manuscript

Journal Name:: Physical Review Materials

Additional Journal Information:: Journal Volume: 3; Journal Issue: 9; Journal ID: ISSN 2475-9953

Publisher:: American Physical Society (APS)

Country of Publication:: United States

Language:: English

Subject:: 75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY; Delafossite; PdCoO2; Triangular oxides; Thin films; Epitaxy

Citation Formats


                    Brahlek, Matthew, Rimal, Gaurab, Ok, Jong Mok, Mukherjee, Debangshu, Mazza, Alessandro R., Lu, Qiyang, Lee, Ho Nyung, Ward, T. Zac, Unocic, Raymond R., Eres, Gyula, and Oh, Seongshik. Growth of metallic delafossite PdCoO2 by molecular beam epitaxy.  United States: N. p., 2019. 
Web.  doi:10.1103/PhysRevMaterials.3.093401.

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                    Brahlek, Matthew, Rimal, Gaurab, Ok, Jong Mok, Mukherjee, Debangshu, Mazza, Alessandro R., Lu, Qiyang, Lee, Ho Nyung, Ward, T. Zac, Unocic, Raymond R., Eres, Gyula, & Oh, Seongshik. Growth of metallic delafossite PdCoO2 by molecular beam epitaxy.  United States.  https://doi.org/10.1103/PhysRevMaterials.3.093401

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                    Brahlek, Matthew, Rimal, Gaurab, Ok, Jong Mok, Mukherjee, Debangshu, Mazza, Alessandro R., Lu, Qiyang, Lee, Ho Nyung, Ward, T. Zac, Unocic, Raymond R., Eres, Gyula, and Oh, Seongshik. Tue .  
"Growth of metallic delafossite PdCoO2 by molecular beam epitaxy".  United States.  https://doi.org/10.1103/PhysRevMaterials.3.093401.  https://www.osti.gov/servlets/purl/1561648.

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@article{osti_1561648,

  title        = {Growth of metallic delafossite PdCoO2 by molecular beam epitaxy},

  author       = {Brahlek, Matthew and Rimal, Gaurab and Ok, Jong Mok and Mukherjee, Debangshu and Mazza, Alessandro R. and Lu, Qiyang and Lee, Ho Nyung and Ward, T. Zac and Unocic, Raymond R. and Eres, Gyula and Oh, Seongshik},

  abstractNote = {The Pd- and Pt-based ABO2 delafossites are a novel class of layered, triangular oxides with two-dimensional electronic structure and a large conductivity that rivals the noble metals. In this work, we report successful growth of the metallic delafossite PdCoO2 by molecular beam epitaxy (MBE). The key challenge is controlling the oxidation of Pd in the MBE environment where phase segregation is driven by the reduction of PdCoO2 to cobalt oxide and metallic palladium. This is overcome by combining low-temperature (300 °C) atomic layer-by-layer MBE growth in the presence of reactive atomic oxygen with a postgrowth high-temperature anneal. Thickness dependence (5–265 nm) reveals that in the thin regime (<75 nm), the resistivity scales inversely with thickness, likely dominated by surface scattering; for thicker films, the resistivity approaches the values reported for the best bulk crystals at room temperature, but the low-temperature resistivity is limited by structural twins. Our report shows that the combination of MBE growth and a postgrowth anneal provides a route to creating high-quality films in this interesting family of layered, triangular oxides.},

  doi          = {10.1103/PhysRevMaterials.3.093401},

  journal      = {Physical Review Materials},

  number       = 9,

  volume       = 3,

  place        = {United States},

  year         = {2019},

  month        = {9}

}

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Works referenced in this record:

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Works referencing / citing this record:

Growth of PdCoO ₂ by ozone-assisted molecular-beam epitaxy
journal, December 2019

Sun, Jiaxin; Barone, Matthew R.; Chang, Celesta S.
APL Materials, Vol. 7, Issue 12
DOI: 10.1063/1.5130627

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Title: Growth of metallic delafossite PdCo O 2 by molecular beam epitaxy

Abstract

Citation Formats

Cobaltous Oxide with the Zinc Blende/Wurtzite-type Crystal Structure journal, March 1962

Correcting nonlinear drift distortion of scanning probe and scanning transmission electron microscopies from image pairs with orthogonal scan directions journal, March 2016

Spin liquids in frustrated magnets journal, March 2010

Frontiers in the Growth of Complex Oxide Thin Films: Past, Present, and Future of Hybrid MBE journal, December 2017

Transparent Conducting Oxides—An Up-To-Date Overview journal, April 2012

The structure of cobalt oxide, Co 3 O 4 journal, February 1973

Structure and Magnetic Properties of Cu 3 Ni 2 SbO 6 and Cu 3 Co 2 SbO 6 Delafossites with Honeycomb Lattices journal, April 2013

Roles of High-Frequency Optical Phonons in the Physical Properties of the Conductive Delafossite PdCoO 2 journal, October 2007

Adsorption-controlled growth of PbTiO3 by reactive molecular beam epitaxy journal, July 1998

Extremely Large Magnetoresistance in the Nonmagnetic Metal PdCoO 2 journal, August 2013

The properties of ultrapure delafossite metals journal, January 2017

Influence of the Preparation Method and Doping on the Magnetic and Electrical Properties of AgNiO2 journal, December 1993

Growth and anisotropic physical properties of metallic conductive oxide PdCoO2 single crystal journal, April 1996

Correlated metals as transparent conductors journal, December 2015

Synthesis science of SrRuO 3 and CaRuO 3 epitaxial films with high residual resistivity ratios journal, April 2018

Quantum Oscillations and High Carrier Mobility in the Delafossite PdCoO 2 journal, September 2012

Highly conductive PdCoO 2 ultrathin films for transparent electrodes journal, April 2018

Chemistry of noble metal oxides. III. Electrical transport properties and crystal chemistry of ABO2 compounds with the delafossite structure journal, April 1971

Polymorphs of Cobalt Oxide journal, February 1991

Perspective: Oxide molecular-beam epitaxy rocks! journal, June 2015

Chemistry of noble metal oxides. II. Crystal structures of platinum cobalt dioxide, palladium cobalt dioxide, coppper iron dioxide, and silver iron dioxide journal, April 1971

Chemistry of noble metal oxides. I. Syntheses and properties of ABO2 delafossite compounds journal, April 1971

Itinerant ferromagnetism of the Pd-terminated polar surface of PdCoO 2 journal, December 2018

P-type electrical conduction in transparent thin films of CuAlO2 journal, October 1997

Constraints on the growth of metallic superlattices journal, September 1988

Maximal Rashba-like spin splitting via kinetic-energy-coupled inversion-symmetry breaking journal, September 2017

The Real Structure of Cu 3 Ni 2 SbO 6 and Cu 3 Co 2 SbO 6 Delafossites with Honeycomb Lattices by Aberration-Corrected HRTEM journal, August 2014

Anisotropic Electric Conductivity of Delafossite PdCoO 2 Studied by Angle-Resolved Photoemission Spectroscopy journal, June 2009

Carbon doping of III–V compounds grown by MOMBE journal, October 1990

Itinerant ferromagnetism of the Pd-terminated polar surface of $PdCoO_{2}$ text, January 2018

Extremely Large Magnetoresistance in the Nonmagnetic Metal PdCoO2 text, January 2013

The properties of ultrapure delafossite metals text, January 2016

Highly conductive PdCoO2 ultrathin films for transparent electrodes text, January 2018

Growth of PdCoO 2 by ozone-assisted molecular-beam epitaxy journal, December 2019

Title: Growth of metallic delafossite $PdCo O_{2}$ by molecular beam epitaxy

Cobaltous Oxide with the Zinc Blende/Wurtzite-type Crystal Structure
journal, March 1962

Correcting nonlinear drift distortion of scanning probe and scanning transmission electron microscopies from image pairs with orthogonal scan directions
journal, March 2016

Spin liquids in frustrated magnets
journal, March 2010

Frontiers in the Growth of Complex Oxide Thin Films: Past, Present, and Future of Hybrid MBE
journal, December 2017

Transparent Conducting Oxides—An Up-To-Date Overview
journal, April 2012

The structure of cobalt oxide, Co ₃ O ₄
journal, February 1973

Structure and Magnetic Properties of Cu ₃ Ni ₂ SbO ₆ and Cu ₃ Co ₂ SbO ₆ Delafossites with Honeycomb Lattices
journal, April 2013

Roles of High-Frequency Optical Phonons in the Physical Properties of the Conductive Delafossite PdCoO ₂
journal, October 2007

Adsorption-controlled growth of PbTiO3 by reactive molecular beam epitaxy
journal, July 1998

Extremely Large Magnetoresistance in the Nonmagnetic Metal ${PdCoO}_{2}$
journal, August 2013

The properties of ultrapure delafossite metals
journal, January 2017

Influence of the Preparation Method and Doping on the Magnetic and Electrical Properties of AgNiO2
journal, December 1993

Growth and anisotropic physical properties of metallic conductive oxide PdCoO2 single crystal
journal, April 1996

Correlated metals as transparent conductors
journal, December 2015

Synthesis science of SrRuO ₃ and CaRuO ₃ epitaxial films with high residual resistivity ratios
journal, April 2018

Quantum Oscillations and High Carrier Mobility in the Delafossite ${PdCoO}_{2}$
journal, September 2012

Highly conductive PdCoO ₂ ultrathin films for transparent electrodes
journal, April 2018

Chemistry of noble metal oxides. III. Electrical transport properties and crystal chemistry of ABO2 compounds with the delafossite structure
journal, April 1971

Polymorphs of Cobalt Oxide
journal, February 1991

Perspective: Oxide molecular-beam epitaxy rocks!
journal, June 2015

Chemistry of noble metal oxides. II. Crystal structures of platinum cobalt dioxide, palladium cobalt dioxide, coppper iron dioxide, and silver iron dioxide
journal, April 1971

Chemistry of noble metal oxides. I. Syntheses and properties of ABO2 delafossite compounds
journal, April 1971

Itinerant ferromagnetism of the Pd-terminated polar surface of PdCoO ₂
journal, December 2018

P-type electrical conduction in transparent thin films of CuAlO2
journal, October 1997

Constraints on the growth of metallic superlattices
journal, September 1988

Maximal Rashba-like spin splitting via kinetic-energy-coupled inversion-symmetry breaking
journal, September 2017

The Real Structure of Cu ₃ Ni ₂ SbO ₆ and Cu ₃ Co ₂ SbO ₆ Delafossites with Honeycomb Lattices by Aberration-Corrected HRTEM
journal, August 2014

Anisotropic Electric Conductivity of Delafossite ${PdCoO}_{2}$ Studied by Angle-Resolved Photoemission Spectroscopy
journal, June 2009

Carbon doping of III–V compounds grown by MOMBE
journal, October 1990

Itinerant ferromagnetism of the Pd-terminated polar surface of $PdCoO_{2}$
text, January 2018

Extremely Large Magnetoresistance in the Nonmagnetic Metal PdCoO2
text, January 2013

The properties of ultrapure delafossite metals
text, January 2016

Highly conductive PdCoO2 ultrathin films for transparent electrodes
text, January 2018

Growth of PdCoO ₂ by ozone-assisted molecular-beam epitaxy
journal, December 2019