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NQR indications of unconventional magnetism in some Bismuth-based diamagnets

机译：NQR指示某些基于铋的磁铁中非常规磁性

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An evidence that local ordered magnetic fields from 30 to 200 G exist in diamagnets alpha-Bi2O3, Bi3O4Br, Bi(4)Gc(3)O(12), Bi2Al4O9 which comprise neither d- nor f-elements was earlier given by the zero-field and Zeeman-perturbed Bi-209 nuclear quadrupole resonance (NQR) spectra. With a view to find similar spectroscopic effects in other compounds, we examined the Bi-209 NQR Zeeman-perturbed spectra of the Bi3B5O12 oriented single crystal as well as the zero-field spin echo envelopes in Bi3B5O12 and Bi2Ge3O9. Distinctive modulations were displayed by the zero-field Bi-209 spin echo envelopes in Bi2Ge3O9 powder. The modeling of the spin echo envelopes within the density matrix formalism explained the observed effect by the presence of local ordered magnetic field of the order of 65 G at the Bi atoms. The zerofield modulations of the Bi-209 spin echo envelopes were also observed in (BiBO12)-B-3-O-5 indicating the presence of the internal source of line splitting. This finding and considerable deviation of the resonance intensity ratios from that in a pure NQR, found in the zero-field Bi-209 spectrum of the single crystal, were understood as indirect evidences that a local ordered magnetic field exists also in Bi3B5O12. The zero-field Bi-209 spin echo envelopes assigned to the lines split by the local magnetic fields in alpha-Bi2O3 and Bi4Ge3O12 were observed to display modulations on the appropriate curves.
机译：零位给出了不包含d-元素和f-元素的30％至200 G局部有序磁场存在于α-Bi2O3，Bi3O4Br，Bi（4）Gc（3）O（12），Bi2Al4O9中的证据。场和塞曼扰动的Bi-209核四极共振（NQR）光谱。为了在其他化合物中找到类似的光谱效应，我们研究了Bi3B5O12定向单晶的Bi-209 NQR Zeeman扰动光谱以及Bi3B5O12和Bi2Ge3O9中的零场自旋回波包络。 Bi2Ge3O9粉末中的零场Bi-209自旋回波包络显示出独特的调制。在密度矩阵形式上的自旋回波包络的建模解释了在Bi原子处存在65 G量级的局部有序磁场所观察到的效果。在（BiBO12）-B-3-O-5中也观察到Bi-209自旋回波包络的零场调制，表明存在内部线分裂源。在单晶零场Bi-209光谱中发现的与纯NQR共振强度比的发现和相当大的偏差被理解为Bi3B5O12中也存在局部有序磁场的间接证据。观察到分配给由alpha-Bi2O3和Bi4Ge3O12中的局部磁场分开的线的零场Bi-209自旋回波包络在适当的曲线上显示调制。

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