TY - JOUR
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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U2 - 10.1103/PhysRevB.89.104406
DO - 10.1103/PhysRevB.89.104406
M3 - Article
AN - SCOPUS:84897883827
VL - 89
JO - Physical Review B-Condensed Matter
JF - Physical Review B-Condensed Matter
SN - 0163-1829
IS - 10
M1 - 104406
ER -