139 La NQR study of antiferromagnetic La2NiO4+δ and La2CoO4−δ
作者： Shinji Wada , Tatsuo Kobayashi , Makoto Kaburagi , Tsuyoshi Kajitani , Syoichi Hosoya
DOI: 10.1016/S0921-4526(09)80242-1
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摘要: 139 La NQR study has been performed on 2 NiO 4+δ and CoO 4−δ . Experimental spectra at low temperatures provided an evidence for the existence of antiferromagnetic ordering in both them. The internal field site (19.3 kOe, ∥ c-axis) (30.5 was significantly large comparing with that CuO (1.0 kOe 1 ⊥ c-axis), suggesting importance exchange interactions via apex oxygen atoms.
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