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Journal Article

Pseudogap of Metallic Layered Nickelate R2-xSrxNiO4 (R = Nd, Eu) Crystals Measured Using Angle-Resolved Photoemission Spectroscopy

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Toschi,  A.
Department Quantum Many-Body Theory (Walter Metzner), Max Planck Institute for Solid State Research, Max Planck Society;

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Arita,  R.
Department Quantum Many-Body Theory (Walter Metzner), Max Planck Institute for Solid State Research, Max Planck Society;

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Held,  K.
Department Quantum Many-Body Theory (Walter Metzner), Max Planck Institute for Solid State Research, Max Planck Society;

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Andersen,  O. K.
Former Departments, Max Planck Institute for Solid State Research, Max Planck Society;

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Citation

Uchida, M., Ishizaka, K., Hansmann, P., Kaneko, Y., Ishida, Y., Yang, X., et al. (2011). Pseudogap of Metallic Layered Nickelate R2-xSrxNiO4 (R = Nd, Eu) Crystals Measured Using Angle-Resolved Photoemission Spectroscopy. Physical Review Letters, 106(2): 027001.


Cite as: https://hdl.handle.net/21.11116/0000-000E-BDE9-7
Abstract
We have investigated charge dynamics and electronic structures for single crystals of metallic layered nickelates, R(2-x)Sr(x)NiO(4) (R = Nd, Eu), isostructural to La(2-x)Sr(x)CuO(4). Angle-resolved photoemission spectroscopy on the barely metallic Eu(0.9)Sr(1.1)NiO(4) (R = Eu, x = 1.1) has revealed a large hole surface of x(2) - y(2) 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 1 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.