並列タイトル等High magnetic field ESR measurements of ACu2(PO4)2[A=Ba, Sr]
一般注記High magnetic field ESR measurements of BaCu(PO4)2 have been performed using a Gunn oscillator (120 GHz) at temperatures from 4.2 K to 140 K. Three resonance lines have been observed below 20 K, while only one resonance has been observed above 20 K. Above 20 K, ESR integrated intensity was in a good agreement with cluster chain model. The best fit of ESR integrated intensity data was obtained with J1/kB=22 K, J2/kB=53 K and J3/kB=12 K. High magnetic field ESR measurements of SrCu2(PO4)2 have been performed using in good agreement with cluster chain model. The best fit of ESR intensity data was obtained with J1/kB=22 K, J2/kB=33 K and J3/kB=6 K. Integrated of ESR absorption for both Ba a d Sr compounds shows a good agreement with cluster chain model. It is consistent with crystallographic symmetry. However, the values of exchange interaction constants J1, J2, J3 obtained from the cluster chain model are different. Sr compound has smaller alternating exchange interaction than Ba compound one. In order to clarify the reason for experimentally observed differences between Ba and Sr compounds, it is necessary to further investigate the crystal structure of the Sr compound.
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連携機関・データベース国立情報学研究所 : 学術機関リポジトリデータベース(IRDB)(機関リポジトリ)