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arXiv 0706.0112cond-mat.str-elcond-mat.mtrl-sci
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高压下SrCu2(BO3)2中的新型有序相

A Novel Ordered Phase in SrCu2(BO3)2 under High Pressure

Takeshi Waki, Koichi Arai, Masashi Takigawa, Yuta Saiga, Yoshiya Uwatoko, Hiroshi Kageyama, Yutaka Ueda

摘要:

本文报道了高压下准二维阻挫二聚体自旋系统SrCu_2(BO_3)_2的~(11)B NMR和磁化率测量结果。在2.4 GPa和7 T的磁场中,NMR谱线随温度的降低分为两步分裂。在T=30 K以下的逐渐分裂破坏了磁响应的四重对称性,随后在3.6 K以下进一步突然分裂。后者表明磁相变,这也是由在1.44 GPa的磁化率扭结标记。从磁超精细位移数据,我们得出结论,低T相有一个双重的单位晶胞包含两种类型的二聚体,一个在近单线态和其他有限的磁化下降到T=0。

英文摘要:

We report results of 11B NMR and susceptibility measurements on the quasi 2D frustrated dimer spin system SrCu2(BO3)2 under high pressure. At 2.4 GPa and in a magnetic field of 7 T, NMR lines split with decreasing temperature in two steps. A gradual splitting below T=30 K breaking the four-fold symmetry of magnetic response is followed by a further sudden splitting below 3.6 K. The latter indicates a magnetic phase transition, which is also marked by a kink in the susceptibility at 1.44 GPa. From the magnetic hyperfine shift data, we conclude that the low-T phase has a doubled unit cell containing two types of dimers, one in a nearly singlet state and the other with a finite magnetization down to T=0.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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