Mott gap collapse in lightly hole-doped Sr 2-x K x IrO 4

The evolution of Sr IrO upon carrier doping has been a subject of intense interest, due to its similarities to the parent cuprates, yet the intrinsic behaviour of Sr IrO upon hole doping remains enigmatic. Here, we synthesize and investigate hole-doped Sr K IrO utilizing a combination of reactive ox...

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Published inNature communications Vol. 11; no. 1; p. 2597
Main Authors Nelson, J N, Parzyck, C T, Faeth, B D, Kawasaki, J K, Schlom, D G, Shen, K M
Format Journal Article
LanguageEnglish
Published England 22.05.2020
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Summary:The evolution of Sr IrO upon carrier doping has been a subject of intense interest, due to its similarities to the parent cuprates, yet the intrinsic behaviour of Sr IrO upon hole doping remains enigmatic. Here, we synthesize and investigate hole-doped Sr K IrO utilizing a combination of reactive oxide molecular-beam epitaxy, substitutional diffusion and in-situ angle-resolved photoemission spectroscopy. Upon hole doping, we observe the formation of a coherent, two-band Fermi surface, consisting of both hole pockets centred at (π, 0) and electron pockets centred at (π/2, π/2). In particular, the strong similarities between the Fermi surface topology and quasiparticle band structure of hole- and electron-doped Sr IrO are striking given the different internal structure of doped electrons versus holes.
ISSN:2041-1723