Epitaxial Stabilization of Metastable 3C BaRuO3 Thin Film with Ferromagnetic Non-Fermi Liquid Phase

Sang A. Lee; Jong Mok Ok; Jegon Lee; Jae Yeol Hwang; Sangmoon Yoon; Se Jeong Park; Sehwan Song; Jong Seong Bae; Sungkyun Park; Ho Nyung Lee; Woo Seok Choi

doi:10.1002/aelm.202001111

Epitaxial Stabilization of Metastable 3C BaRuO₃ Thin Film with Ferromagnetic Non-Fermi Liquid Phase

Sang A. Lee, Jong Mok Ok, Jegon Lee, Jae Yeol Hwang, Sangmoon Yoon, Se Jeong Park, Sehwan Song, Jong Seong Bae, Sungkyun Park, Ho Nyung Lee, Woo Seok Choi

Materials Science and Technology Div

Research output: Contribution to journal › Article › peer-review

10 Scopus citations

Abstract

Thin films of perovskite ruthenates of the general formula ARuO₃ (A = Ca and Sr) are versatile electrical conductors for viable oxide electronics. They are also scientifically intriguing, as they exhibit nontrivial electromagnetic ground states depending on the A-site element. Among them, realization of the cubic perovskite (3C) BaRuO₃ in thin film form has been a challenge so far, because the 3C phase is metastable with the largest formation energy among the various polymorph phases of BaRuO₃. In this study, 3C BaRuO₃ thin films are successfully prepared employing epitaxial stabilization. The 3C BaRuO₃ thin films show itinerant ferromagnetism with a transition temperature of ≈48 K and a non-Fermi liquid phase. The epitaxial stabilization of the 3C BaRuO₃ further enables to make a standard comparison of perovskite ruthenates, thereby establishing the importance of the Ru-O orbital hybridization in understanding the itinerant magnetic system.

Original language	English
Article number	2001111
Journal	Advanced Electronic Materials
Volume	7
Issue number	4
DOIs	https://doi.org/10.1002/aelm.202001111
State	Published - Apr 2021

Funding

This work was supported by Basic Science Research Programs through the National Research Foundation of Korea (NRF) (NRF‐2019R1A2B5B02004546, NRF‐2019R1A2C1005267 (S.AL.), NRF‐2020R1F1A1073076 (J‐.Y.H.), and NRF‐2020K1A3A7A09077715) and Korea Basic Science Institute (National Research Facilities and Equipment Center) grant funded by the Ministry of Education (2019R1A6C1020015). The transport measurements and analyses at ORNL were supported by the U.S. Department of Energy, Office of Science, Basic Energy Sciences, Materials Sciences and Engineering Division. This work was supported by Basic Science Research Programs through the National Research Foundation of Korea (NRF) (NRF-2019R1A2B5B02004546, NRF-2019R1A2C1005267 (S.AL.), NRF-2020R1F1A1073076 (J-.Y.H.), and NRF-2020K1A3A7A09077715) and Korea Basic Science Institute (National Research Facilities and Equipment Center) grant funded by the Ministry of Education (2019R1A6C1020015). The transport measurements and analyses at ORNL were supported by the U.S. Department of Energy, Office of Science, Basic Energy Sciences, Materials Sciences and Engineering Division.

Funders	Funder number
NRF-2019R1A2B5B02004546
NRF-2019R1A2C1005267
NRF-2020R1F1A1073076
National research Facilities and Equipment Center
U.S. Department of Energy
Office of Science
Basic Energy Sciences
Division of Materials Sciences and Engineering
Ministry of Education	2019R1A6C1020015
Korea Basic Science Institute
National Research Foundation of Korea	NRF‐2020K1A3A7A09077715, NRF‐2019R1A2B5B02004546, NRF‐2019R1A2C1005267, NRF‐2020R1F1A1073076

Keywords

3C BaRuO
epitaxial stabilization
ferromagnetism
hybridization control
non-Fermi liquids
ruthenates

Access to Document

10.1002/aelm.202001111

Cite this

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title = "Epitaxial Stabilization of Metastable 3C BaRuO3 Thin Film with Ferromagnetic Non-Fermi Liquid Phase",

abstract = "Thin films of perovskite ruthenates of the general formula ARuO3 (A = Ca and Sr) are versatile electrical conductors for viable oxide electronics. They are also scientifically intriguing, as they exhibit nontrivial electromagnetic ground states depending on the A-site element. Among them, realization of the cubic perovskite (3C) BaRuO3 in thin film form has been a challenge so far, because the 3C phase is metastable with the largest formation energy among the various polymorph phases of BaRuO3. In this study, 3C BaRuO3 thin films are successfully prepared employing epitaxial stabilization. The 3C BaRuO3 thin films show itinerant ferromagnetism with a transition temperature of ≈48 K and a non-Fermi liquid phase. The epitaxial stabilization of the 3C BaRuO3 further enables to make a standard comparison of perovskite ruthenates, thereby establishing the importance of the Ru-O orbital hybridization in understanding the itinerant magnetic system.",

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author = "Lee, {Sang A.} and Ok, {Jong Mok} and Jegon Lee and Hwang, {Jae Yeol} and Sangmoon Yoon and Park, {Se Jeong} and Sehwan Song and Bae, {Jong Seong} and Sungkyun Park and Lee, {Ho Nyung} and Choi, {Woo Seok}",

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doi = "10.1002/aelm.202001111",

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AU - Lee, Sang A.

AU - Ok, Jong Mok

AU - Lee, Jegon

AU - Hwang, Jae Yeol

AU - Yoon, Sangmoon

AU - Park, Se Jeong

AU - Song, Sehwan

AU - Bae, Jong Seong

AU - Park, Sungkyun

AU - Lee, Ho Nyung

AU - Choi, Woo Seok

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N2 - Thin films of perovskite ruthenates of the general formula ARuO3 (A = Ca and Sr) are versatile electrical conductors for viable oxide electronics. They are also scientifically intriguing, as they exhibit nontrivial electromagnetic ground states depending on the A-site element. Among them, realization of the cubic perovskite (3C) BaRuO3 in thin film form has been a challenge so far, because the 3C phase is metastable with the largest formation energy among the various polymorph phases of BaRuO3. In this study, 3C BaRuO3 thin films are successfully prepared employing epitaxial stabilization. The 3C BaRuO3 thin films show itinerant ferromagnetism with a transition temperature of ≈48 K and a non-Fermi liquid phase. The epitaxial stabilization of the 3C BaRuO3 further enables to make a standard comparison of perovskite ruthenates, thereby establishing the importance of the Ru-O orbital hybridization in understanding the itinerant magnetic system.

AB - Thin films of perovskite ruthenates of the general formula ARuO3 (A = Ca and Sr) are versatile electrical conductors for viable oxide electronics. They are also scientifically intriguing, as they exhibit nontrivial electromagnetic ground states depending on the A-site element. Among them, realization of the cubic perovskite (3C) BaRuO3 in thin film form has been a challenge so far, because the 3C phase is metastable with the largest formation energy among the various polymorph phases of BaRuO3. In this study, 3C BaRuO3 thin films are successfully prepared employing epitaxial stabilization. The 3C BaRuO3 thin films show itinerant ferromagnetism with a transition temperature of ≈48 K and a non-Fermi liquid phase. The epitaxial stabilization of the 3C BaRuO3 further enables to make a standard comparison of perovskite ruthenates, thereby establishing the importance of the Ru-O orbital hybridization in understanding the itinerant magnetic system.

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