High Field Magnetization of Single Crystals of the S=1/2 Quasi-1D Ising-like Antiferromagnet SrCo₂V₂O₈

详细信息    查看全文

• 作者：Akira Okutani^a ; ^b ; ^{okutani@mag.ahmf.sci.osaka-u.ac.jp" class="auth_mail" title="E-mail the corresponding author} ; Takanori Kida^a ; ^b ; ^{kida@ahmf.sci.osaka-u.ac.jp" class="auth_mail" title="E-mail the corresponding author} ; Tomoyasu Usui^c ; ^{usui@crystal.mp.es.osaka-u.ac.jp" class="auth_mail" title="E-mail the corresponding author} ; Tsuyoshi Kimura^b ; ^c ; ^{kimura@mp.es.osaka-u.ac.jp" class="auth_mail" title="E-mail the corresponding author} ; Kouichi Okunishi^d ; ^{okunishi@phys.sc.niigata-u.ac.jp" class="auth_mail" title="E-mail the corresponding author} ; Masayuki Hagiwara^a ; ^b ; ^{hagiwara@ahmf.sci.osaka-u.ac.jp" class="auth_mail" title="E-mail the corresponding author}
• 关键词：Magnetization curves ; magnetic susceptibility ; single crystals ; S=1/2 1D Ising-like antiferromagnet
• 刊名：Physics Procedia
• 出版年：2015
• 出版时间：2015
• 年：2015
• 卷：75
• 期：Complete
• 页码：779-784
• 全文大小：649 K

文摘

We report on the results of magnetic susceptibility and high field magnetization measurements on single crystals of SrCo₂V₂O₈, which is regarded as an S = 1/2 quasi one-dimensional Ising-like antiferromagnet and is almost isostructural to BaCo₂V₂O₈ that has exhibited a field-induced order-to-disorder transition. The magnetization measurements have been performed at 1.4 K below the Néel temperature T_N = 4.8 K in pulsed fields of up to 50 T. The temperature dependence of magnetic susceptibility parallel to the c-axis (chain axis) has a broad maximum near 40 K, which is typical of a low dimensional antiferromagnet, while the susceptibilities perpendicular to the c-axis do not show such a maximum. The magnetization at 1.9 K along the c-axis shows a steep increase at 3.8 T as in BaCo₂V₂O₈, corresponding to the field-induced order-to-disorder transition. The magnetization curve along the c-axis up to the saturation magnetization is well fitted to the magnetization curve calculated by the exact solution based on the Bethe ansatz for an S = 1/2 XXZ model, and this analysis provides parameter values for the exchange constant J/k_B = 78 K, the anisotropic exchange parameter ɛ = 0.50, and the g-value along the c-axis g_c = 6.1. In contrast, the magnetization curves perpendicular to the c-axis show gradual increase up to 50 T.