Magnetic and electrical anisotropy with correlation and orbital effects in dimerized honeycomb ruthenate L i2Ru O3

Seokhwan Yun; Ki Hoon Lee; Se Young Park; Teck Yee Tan; Junghwan Park; Soonmin Kang; D. I. Khomskii; Younjung Jo; Je Geun Park

doi:10.1103/PhysRevB.100.165119

Magnetic and electrical anisotropy with correlation and orbital effects in dimerized honeycomb ruthenate L i2Ru O3

Seokhwan Yun, Ki Hoon Lee, Se Young Park, Teck Yee Tan, Junghwan Park, Soonmin Kang, D. I. Khomskii, Younjung Jo, Je Geun Park

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Abstract

Li2RuO3 undergoes a structural transition at a relatively high temperature of 550 K with a distinct dimerization of Ru-Ru bonds on the otherwise isotropic honeycomb lattice. It exhibits a unique herringbone dimerization pattern with an unusually large value of bond shrinkage, about ∼0.5Å. However, many questions still remain about its origin and its effect on the physical properties. In this work, using high-quality single crystals we investigated the anisotropy of resistivity (ρ) and magnetic susceptibility (χ) to find a very clear anisotropy: ρc∗>ρb>ρa and χb>χa>χc∗. We also carried out density functional calculations for possible theoretical interpretations, and concluded that this anisotropic behavior is due to the correlation effects combined with the unique orbital structure and the dimerization of Ru 4d bands.

Original language	English
Article number	165119
Journal	Physical Review B
Volume	100
Issue number	16
DOIs	https://doi.org/10.1103/PhysRevB.100.165119
State	Published - 14 Oct 2019

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title = "Magnetic and electrical anisotropy with correlation and orbital effects in dimerized honeycomb ruthenate L i2Ru O3",

abstract = "Li2RuO3 undergoes a structural transition at a relatively high temperature of 550 K with a distinct dimerization of Ru-Ru bonds on the otherwise isotropic honeycomb lattice. It exhibits a unique herringbone dimerization pattern with an unusually large value of bond shrinkage, about ∼0.5{\AA}. However, many questions still remain about its origin and its effect on the physical properties. In this work, using high-quality single crystals we investigated the anisotropy of resistivity (ρ) and magnetic susceptibility (χ) to find a very clear anisotropy: ρc∗>ρb>ρa and χb>χa>χc∗. We also carried out density functional calculations for possible theoretical interpretations, and concluded that this anisotropic behavior is due to the correlation effects combined with the unique orbital structure and the dimerization of Ru 4d bands.",

author = "Seokhwan Yun and Lee, {Ki Hoon} and Park, {Se Young} and Tan, {Teck Yee} and Junghwan Park and Soonmin Kang and Khomskii, {D. I.} and Younjung Jo and Park, {Je Geun}",

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doi = "10.1103/PhysRevB.100.165119",

language = "English",

volume = "100",

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T1 - Magnetic and electrical anisotropy with correlation and orbital effects in dimerized honeycomb ruthenate L i2Ru O3

AU - Yun, Seokhwan

AU - Lee, Ki Hoon

AU - Park, Se Young

AU - Tan, Teck Yee

AU - Park, Junghwan

AU - Kang, Soonmin

AU - Khomskii, D. I.

AU - Jo, Younjung

AU - Park, Je Geun

PY - 2019/10/14

Y1 - 2019/10/14

N2 - Li2RuO3 undergoes a structural transition at a relatively high temperature of 550 K with a distinct dimerization of Ru-Ru bonds on the otherwise isotropic honeycomb lattice. It exhibits a unique herringbone dimerization pattern with an unusually large value of bond shrinkage, about ∼0.5Å. However, many questions still remain about its origin and its effect on the physical properties. In this work, using high-quality single crystals we investigated the anisotropy of resistivity (ρ) and magnetic susceptibility (χ) to find a very clear anisotropy: ρc∗>ρb>ρa and χb>χa>χc∗. We also carried out density functional calculations for possible theoretical interpretations, and concluded that this anisotropic behavior is due to the correlation effects combined with the unique orbital structure and the dimerization of Ru 4d bands.

AB - Li2RuO3 undergoes a structural transition at a relatively high temperature of 550 K with a distinct dimerization of Ru-Ru bonds on the otherwise isotropic honeycomb lattice. It exhibits a unique herringbone dimerization pattern with an unusually large value of bond shrinkage, about ∼0.5Å. However, many questions still remain about its origin and its effect on the physical properties. In this work, using high-quality single crystals we investigated the anisotropy of resistivity (ρ) and magnetic susceptibility (χ) to find a very clear anisotropy: ρc∗>ρb>ρa and χb>χa>χc∗. We also carried out density functional calculations for possible theoretical interpretations, and concluded that this anisotropic behavior is due to the correlation effects combined with the unique orbital structure and the dimerization of Ru 4d bands.

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U2 - 10.1103/PhysRevB.100.165119

DO - 10.1103/PhysRevB.100.165119

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VL - 100

JO - Physical Review B

JF - Physical Review B

IS - 16

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ER -

Magnetic and electrical anisotropy with correlation and orbital effects in dimerized honeycomb ruthenate L i2Ru O3

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