Effects of hole doping on magnetic and lattice excitations in Sr 2 Ir 1 - X Ru x O 4 (x = 0 - 0.2)

A. Glamazda; W. J. Lee; K. Y. Choi; P. Lemmens; H. Y. Choi; N. Lee; Y. J. Choi

doi:10.1103/PhysRevB.89.104406

Effects of hole doping on magnetic and lattice excitations in Sr 2 Ir 1 - X Ru x O 4 (x = 0 - 0.2)

A. Glamazda, W. J. Lee, K. Y. Choi, P. Lemmens, H. Y. Choi, N. Lee, Y. J. Choi

Department of Physics

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

18 Citations (Scopus)

Abstract

Raman scattering is employed to explore the effects of hole doping in single crystals of Sr2Ir1-xRuxO4 (x=0, 0.01, 0.03, 0.05, 0.1, and 0.2). Introducing a few percentages of holes has a strong impact on magnetic excitations and lattice dynamics. With increasing x the well structured two-magnon continuum turns into diffusive magnetic scattering. Furthermore one- and two-phonon scatterings are rapidly suppressed. Remarkably, the two Ir(Ru)-O-Ir(Ru) bond angle modes with different Ir(Ru)O6 octahedral rotations coexist and compete upon hole doping. This is ascribed to the difference of electronic properties between Ir4+ and Ru4+ ions. The doping and temperature dependence of the bond angle modes suggests that an electronically phase separated state develops upon Ru doping.

Original language	English
Article number	104406
Journal	Physical Review B - Condensed Matter and Materials Physics
Volume	89
Issue number	10
DOIs	https://doi.org/10.1103/PhysRevB.89.104406
Publication status	Published - 2014 Mar 10

All Science Journal Classification (ASJC) codes

Electronic, Optical and Magnetic Materials
Condensed Matter Physics

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title = "Effects of hole doping on magnetic and lattice excitations in Sr 2 Ir 1 - X Ru x O 4 (x = 0 - 0.2)",

abstract = "Raman scattering is employed to explore the effects of hole doping in single crystals of Sr2Ir1-xRuxO4 (x=0, 0.01, 0.03, 0.05, 0.1, and 0.2). Introducing a few percentages of holes has a strong impact on magnetic excitations and lattice dynamics. With increasing x the well structured two-magnon continuum turns into diffusive magnetic scattering. Furthermore one- and two-phonon scatterings are rapidly suppressed. Remarkably, the two Ir(Ru)-O-Ir(Ru) bond angle modes with different Ir(Ru)O6 octahedral rotations coexist and compete upon hole doping. This is ascribed to the difference of electronic properties between Ir4+ and Ru4+ ions. The doping and temperature dependence of the bond angle modes suggests that an electronically phase separated state develops upon Ru doping.",

author = "A. Glamazda and Lee, {W. J.} and Choi, {K. Y.} and P. Lemmens and Choi, {H. Y.} and N. Lee and Choi, {Y. J.}",

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T1 - Effects of hole doping on magnetic and lattice excitations in Sr 2 Ir 1 - X Ru x O 4 (x = 0 - 0.2)

AU - Glamazda, A.

AU - Lee, W. J.

AU - Choi, K. Y.

AU - Lemmens, P.

AU - Choi, H. Y.

AU - Lee, N.

AU - Choi, Y. J.

PY - 2014/3/10

Y1 - 2014/3/10

N2 - Raman scattering is employed to explore the effects of hole doping in single crystals of Sr2Ir1-xRuxO4 (x=0, 0.01, 0.03, 0.05, 0.1, and 0.2). Introducing a few percentages of holes has a strong impact on magnetic excitations and lattice dynamics. With increasing x the well structured two-magnon continuum turns into diffusive magnetic scattering. Furthermore one- and two-phonon scatterings are rapidly suppressed. Remarkably, the two Ir(Ru)-O-Ir(Ru) bond angle modes with different Ir(Ru)O6 octahedral rotations coexist and compete upon hole doping. This is ascribed to the difference of electronic properties between Ir4+ and Ru4+ ions. The doping and temperature dependence of the bond angle modes suggests that an electronically phase separated state develops upon Ru doping.

AB - Raman scattering is employed to explore the effects of hole doping in single crystals of Sr2Ir1-xRuxO4 (x=0, 0.01, 0.03, 0.05, 0.1, and 0.2). Introducing a few percentages of holes has a strong impact on magnetic excitations and lattice dynamics. With increasing x the well structured two-magnon continuum turns into diffusive magnetic scattering. Furthermore one- and two-phonon scatterings are rapidly suppressed. Remarkably, the two Ir(Ru)-O-Ir(Ru) bond angle modes with different Ir(Ru)O6 octahedral rotations coexist and compete upon hole doping. This is ascribed to the difference of electronic properties between Ir4+ and Ru4+ ions. The doping and temperature dependence of the bond angle modes suggests that an electronically phase separated state develops upon Ru doping.

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