Direct observation of spin excitation anisotropy in the paramagnetic orthorhombic state of ${\mathbf{BaFe}}_{\mathbit{2}−\mathbit{x}}{\mathbf{Ni}}_{\mathbit{x}}{\mathbf{As}}_{\mathbf{2}}$

Haoran Man, Rui Zhang, J. T. Park, Xingye Lu, J. Kulda, A. Ivanov, and Pengcheng Dai
American Physical Society (APS)
Published 2018