Evidence for a Nematic Phase in La1.75Sr0.25NiO4

Ruidan Zhong; Barry L. Winn; Genda Gu; Dmitry Reznik; J. M. Tranquada

doi:10.1103/PhysRevLett.118.177601

Evidence for a Nematic Phase in La1.75Sr0.25NiO4

Ruidan Zhong, Barry L. Winn, Genda Gu, Dmitry Reznik, J. M. Tranquada

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15 Scopus citations

Abstract

Determining the nature of electronic states in doped Mott insulators remains a challenging task. In the case of tetragonal La2-xSrxNiO4, the occurrence of diagonal charge and spin stripe order in the ground state is now well established. In contrast, the nature of the high-temperature "disordered" state from which the stripe order develops has long been a subject of controversy, with considerable speculation regarding a polaronic liquid. Following the recent detection of dynamic charge stripes, we use neutron scattering measurements on an x=0.25 crystal to demonstrate that the dispersion of the charge-stripe excitations is anisotropic. This observation provides compelling evidence for the presence of electronic nematic order.

Original language	English
Article number	177601
Journal	Physical Review Letters
Volume	118
Issue number	17
DOIs	https://doi.org/10.1103/PhysRevLett.118.177601
State	Published - Apr 28 2017

Funding

Work at Brookhaven is supported by the Office of Basic Energy Sciences (BES), Materials Sciences and Engineering Division (MSED), U.S. Department of Energy (DOE) under Contract No. DE-SC0012704. D.R. is also supported by BES/MSED under Contract No.DE-SC0006939. A portion of this research used resources at the Spallation Neutron Source, a DOE Office of Science User Facility, operated by the Oak Ridge National Laboratory.

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abstract = "Determining the nature of electronic states in doped Mott insulators remains a challenging task. In the case of tetragonal La2-xSrxNiO4, the occurrence of diagonal charge and spin stripe order in the ground state is now well established. In contrast, the nature of the high-temperature {"}disordered{"} state from which the stripe order develops has long been a subject of controversy, with considerable speculation regarding a polaronic liquid. Following the recent detection of dynamic charge stripes, we use neutron scattering measurements on an x=0.25 crystal to demonstrate that the dispersion of the charge-stripe excitations is anisotropic. This observation provides compelling evidence for the presence of electronic nematic order.",

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AB - Determining the nature of electronic states in doped Mott insulators remains a challenging task. In the case of tetragonal La2-xSrxNiO4, the occurrence of diagonal charge and spin stripe order in the ground state is now well established. In contrast, the nature of the high-temperature "disordered" state from which the stripe order develops has long been a subject of controversy, with considerable speculation regarding a polaronic liquid. Following the recent detection of dynamic charge stripes, we use neutron scattering measurements on an x=0.25 crystal to demonstrate that the dispersion of the charge-stripe excitations is anisotropic. This observation provides compelling evidence for the presence of electronic nematic order.

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Evidence for a Nematic Phase in La1.75Sr0.25NiO4

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