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Pseudogap of metallic layered nickelate R2-xSrxNiO4 (R=Nd, Eu) crystals measured using angle-resolved photoemission spectroscopy

We have investigated charge dynamics and electronic structures for single crystals of metallic layered nickelates, R2-xSrxNiO4 (R=Nd, Eu), isostructural to La2-xSrxCuO4. Angle-resolved photoemission spectroscopy on the barely-metallic Eu0.9Sr1.1NiO4 (R=Eu, x=1.1) has revealed a large hole surface of x2-y2 character with a high-energy pseudogap of the same symmetry and comparable magnitude with those of underdoped (x<0.1) cuprates, although the antiferromagnetic interactions are one order of magnitude smaller. This finding strongly indicates that the momentum-dependent pseudogap feature in the layered nickelate arises from the real-space charge correlation.

preprint2011arXivOpen access
M. UchidaK. IshizakaP. HansmannY. KanekoY. IshidaX. YangR. KumaiA. ToschiY. OnoseR. AritaK. HeldO. K. AndersenS. ShinY. Tokura
cond-mat.str-el
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Open access14 authors1 topic
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M. UchidaK. IshizakaP. HansmannY. KanekoY. IshidaX. YangR. KumaiA. ToschiY. OnoseR. AritaK. HeldO. K. AndersenS. ShinY. Tokura

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