Zero-field NMR and NQR studies of magnetically ordered state in charge-ordered EuPtP
Zero-field NMR and NQR studies of magnetically ordered state in charge-ordered EuPtP
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电荷有序 EuPtP 中磁有序态的零场 NMR 和 NQR 研究
DOI：
10.1103/physrevb.91.094419
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发表时间：
2015
期刊：
影响因子：
--
通讯作者：
and H. Wada
中科院分区：
文献类型：
--
作者：
T. Koyama;T. Maruyama;K. Ueda;T. Mito;A. Mitsuda;M. Umeda;M. Sugishima;and H. Wada
EuPtP在低温下经历两个价态跃迁，具有两种Eu离子的价态。在电荷有序状态下，该化合物显示出归因于磁性二价Eu离子的反铁磁顺序。利用核磁共振（NMR）和核四极矩共振（NQR）方法研究了零外磁场下EuPtP的反铁磁有序态。磁性二价态的核磁共振信号和磁性三价态的NQR信号清楚地表明，即使在磁性层中间的层中，六方基面内的自旋有序性和内部磁场也没有被抵消。此外，通过对磁共振谱的观察，我们还讨论了一种可能的磁结构.我们还评估了bothandion态的核四极频率。
EuPtP undergoes two valence transitions and has two kinds of valence states of Eu ions at low temperatures. In the charge-ordered state, this compound shows an antiferromagnetic order ascribed to magnetic divalent Eu ions. We investigated the antiferromagnetically ordered state of EuPtP by nuclear magnetic resonance (NMR) measurement and nuclear quadrupole resonance (NQR) measurement in a zero external magnetic field. The observedNMR signals of a magnetic divalent state andNQR signals of a nonmagnetic trivalent state clearly demonstrate that the spins order in the hexagonal basal plane and the internal magnetic field is not canceled out, even at thelayers which are in the middle of magneticlayers. In addition, the observation ofandNMR spectra allowed us to discuss a possible magnetic structure. We also evaluated the nuclear quadrupole frequencies for bothandion states.