Journal
PHYSICAL REVIEW B
Volume 89, Issue 10, Pages -Publisher
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevB.89.104406
Keywords
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Funding
- National Research Foundation of Korea [2012M2B2A4029730, 21A20131100006, 2009-0093817, 2013R1A1A2058155, 2012R1A2A2A01046138] Funding Source: Korea Institute of Science & Technology Information (KISTI), National Science & Technology Information Service (NTIS)
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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)O-6 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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