Journal
PHYSICAL REVIEW LETTERS
Volume 118, Issue 17, Pages -Publisher
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevLett.118.177601
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Funding
- Office of Basic Energy Sciences (BES), Materials Sciences and Engineering Division (MSED), U.S. Department of Energy (DOE) [DE-SC0012704]
- BES/MSED [DE-SC0006939]
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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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