La NQR Study of Antiferromagnetic La2NiO4+δ

Shinji Wada; Tatsuo Kobayashi; Makoto Kaburagi

doi:10.1143/JPSJ.58.2658

La NQR Study of Antiferromagnetic La₂NiO_4+δ

Shinji Wada, Tatsuo Kobayashi, Makoto Kaburagi

Research output: Contribution to journal › Article › peer-review

8 Citations (Scopus)

Abstract

The magnetic properties in the La₂Ni0_4+δ system have been investigated by ¹³⁹La nuclear quadrupole resonance (NQR). The structure of the NQR spectrum at 1.4 K was found to depend sensitively on annealing procedures of the compounds, and therefore on δ. A well-characterized spectrum was obtained for samples oxygenated (δ≧ 0.066) and deoxygenated (δ~0.022) with different structures, exhibiting the existence of the internal magnetic fieldsH_mt of ~17.8 kOe nearly parallel to the basal Ni-O plane and ~19.3 kOe perpendicular to the plane. The strength ofH_m at the La site was significantly large when compared with that of ~ 1 kOe in La₂CuO₄ and could not be explained simply by the dipole field caused by Ni spin moments.

Original language	English
Pages (from-to)	2658-2661
Number of pages	4
Journal	journal of the physical society of japan
Volume	58
Issue number	8
DOIs	https://doi.org/10.1143/JPSJ.58.2658
Publication status	Published - Jan 1 1989
Externally published	Yes

Keywords

antiferromagnetism
layered perovskite
nuclear quadrupole resonance

ASJC Scopus subject areas

Physics and Astronomy(all)

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10.1143/JPSJ.58.2658

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title = "La NQR Study of Antiferromagnetic La2NiO4+δ",

abstract = "The magnetic properties in the La2Ni04+δ system have been investigated by 139La nuclear quadrupole resonance (NQR). The structure of the NQR spectrum at 1.4 K was found to depend sensitively on annealing procedures of the compounds, and therefore on δ. A well-characterized spectrum was obtained for samples oxygenated (δ≧ 0.066) and deoxygenated (δ~0.022) with different structures, exhibiting the existence of the internal magnetic fieldsHmt of ~17.8 kOe nearly parallel to the basal Ni-O plane and ~19.3 kOe perpendicular to the plane. The strength ofHm at the La site was significantly large when compared with that of ~ 1 kOe in La2CuO4 and could not be explained simply by the dipole field caused by Ni spin moments.",

keywords = "antiferromagnetism, layered perovskite, nuclear quadrupole resonance",

author = "Shinji Wada and Tatsuo Kobayashi and Makoto Kaburagi",

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AU - Wada, Shinji

AU - Kobayashi, Tatsuo

AU - Kaburagi, Makoto

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N2 - The magnetic properties in the La2Ni04+δ system have been investigated by 139La nuclear quadrupole resonance (NQR). The structure of the NQR spectrum at 1.4 K was found to depend sensitively on annealing procedures of the compounds, and therefore on δ. A well-characterized spectrum was obtained for samples oxygenated (δ≧ 0.066) and deoxygenated (δ~0.022) with different structures, exhibiting the existence of the internal magnetic fieldsHmt of ~17.8 kOe nearly parallel to the basal Ni-O plane and ~19.3 kOe perpendicular to the plane. The strength ofHm at the La site was significantly large when compared with that of ~ 1 kOe in La2CuO4 and could not be explained simply by the dipole field caused by Ni spin moments.

AB - The magnetic properties in the La2Ni04+δ system have been investigated by 139La nuclear quadrupole resonance (NQR). The structure of the NQR spectrum at 1.4 K was found to depend sensitively on annealing procedures of the compounds, and therefore on δ. A well-characterized spectrum was obtained for samples oxygenated (δ≧ 0.066) and deoxygenated (δ~0.022) with different structures, exhibiting the existence of the internal magnetic fieldsHmt of ~17.8 kOe nearly parallel to the basal Ni-O plane and ~19.3 kOe perpendicular to the plane. The strength ofHm at the La site was significantly large when compared with that of ~ 1 kOe in La2CuO4 and could not be explained simply by the dipole field caused by Ni spin moments.

KW - antiferromagnetism

KW - layered perovskite

KW - nuclear quadrupole resonance

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