Pseudogap of metallic layered nickelate R2-xSr xNiO4 (R=Nd,Eu) crystals measured using angle-resolved photoemission spectroscopy

M. Uchida; K. Ishizaka; P. Hansmann; Y. Kaneko; Y. Ishida; X. Yang; R. Kumai; A. Toschi; Y. Onose; R. Arita; K. Held; O. K. Andersen; S. Shin; Y. Tokura

doi:10.1103/PhysRevLett.106.027001

Pseudogap of metallic layered nickelate R_2-xSr _xNiO₄ (R=Nd,Eu) crystals measured using angle-resolved photoemission spectroscopy

M. Uchida, K. Ishizaka, P. Hansmann, Y. Kaneko, Y. Ishida, X. Yang, R. Kumai, A. Toschi, Y. Onose, R. Arita, K. Held, O. K. Andersen, S. Shin, Y. Tokura

IMR - Materials Design Division

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Abstract

We have investigated charge dynamics and electronic structures for single crystals of metallic layered nickelates, R_2-xSr_xNiO ₄ (R=Nd,Eu), isostructural to La_2-xSr_xCuO ₄. Angle-resolved photoemission spectroscopy on the barely metallic Eu_0.9Sr_1.1NiO₄ (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 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.

Original language	English
Article number	027001
Journal	Physical Review Letters
Volume	106
Issue number	2
DOIs	https://doi.org/10.1103/PhysRevLett.106.027001
Publication status	Published - 2011 Jan 12

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Uchida, M., Ishizaka, K., Hansmann, P., Kaneko, Y., Ishida, Y., Yang, X., Kumai, R., Toschi, A., Onose, Y., Arita, R., Held, K., Andersen, O. K., Shin, S., & Tokura, Y. (2011). Pseudogap of metallic layered nickelate R_2-xSr _xNiO₄ (R=Nd,Eu) crystals measured using angle-resolved photoemission spectroscopy. Physical Review Letters, 106(2), Article 027001. https://doi.org/10.1103/PhysRevLett.106.027001

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title = "Pseudogap of metallic layered nickelate R2-xSr xNiO4 (R=Nd,Eu) crystals measured using angle-resolved photoemission spectroscopy",

abstract = "We have investigated charge dynamics and electronic structures for single crystals of metallic layered nickelates, R2-xSrxNiO 4 (R=Nd,Eu), isostructural to La2-xSrxCuO 4. 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 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.",

author = "M. Uchida and K. Ishizaka and P. Hansmann and Y. Kaneko and Y. Ishida and X. Yang and R. Kumai and A. Toschi and Y. Onose and R. Arita and K. Held and Andersen, {O. K.} and S. Shin and Y. Tokura",

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doi = "10.1103/PhysRevLett.106.027001",

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Uchida, M, Ishizaka, K, Hansmann, P, Kaneko, Y, Ishida, Y, Yang, X, Kumai, R, Toschi, A, Onose, Y, Arita, R, Held, K, Andersen, OK, Shin, S & Tokura, Y 2011, 'Pseudogap of metallic layered nickelate R_2-xSr _xNiO₄ (R=Nd,Eu) crystals measured using angle-resolved photoemission spectroscopy', Physical Review Letters, vol. 106, no. 2, 027001. https://doi.org/10.1103/PhysRevLett.106.027001

TY - JOUR

T1 - Pseudogap of metallic layered nickelate R2-xSr xNiO4 (R=Nd,Eu) crystals measured using angle-resolved photoemission spectroscopy

AU - Uchida, M.

AU - Ishizaka, K.

AU - Hansmann, P.

AU - Kaneko, Y.

AU - Ishida, Y.

AU - Yang, X.

AU - Kumai, R.

AU - Toschi, A.

AU - Onose, Y.

AU - Arita, R.

AU - Held, K.

AU - Andersen, O. K.

AU - Shin, S.

AU - Tokura, Y.

PY - 2011/1/12

Y1 - 2011/1/12

N2 - We have investigated charge dynamics and electronic structures for single crystals of metallic layered nickelates, R2-xSrxNiO 4 (R=Nd,Eu), isostructural to La2-xSrxCuO 4. 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 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.

AB - We have investigated charge dynamics and electronic structures for single crystals of metallic layered nickelates, R2-xSrxNiO 4 (R=Nd,Eu), isostructural to La2-xSrxCuO 4. 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 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.

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Pseudogap of metallic layered nickelate R_2-xSr _xNiO₄ (R=Nd,Eu) crystals measured using angle-resolved photoemission spectroscopy

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