Magnetic Properties of Rare Earth Titanates Ho2Ti2O7 and Yb2Ti2O7 Doped with Y and Bi

被引:1
作者
Nemytova, O. V. [1 ]
Rinkevich, A. B. [1 ]
Perov, D. V. [1 ]
Koroleva, M. S. [2 ]
Piir, I. V. [2 ]
Korkh, Y. V. [1 ]
机构
[1] RAS, MN Mikheev Inst Met Phys, Ural Branch, 18 S Kovalevskaya St, Ekaterinburg 620108, Russia
[2] RAS, Inst Chem, Fed Res Ctr Komi Sci Ctr, Ural Branch, Pervomayskaya Str 48, Syktyvkar 167000, Russia
关键词
Frustrated rare earth titanates; Doped titanates; Magnetization curves; g-factor; Effective magnetic moment; Temperature dependence of susceptibility; Curie-Weiss temperatures; Dipole and superexchange interaction;
D O I
10.1007/s10948-024-06801-x
中图分类号
O59 [应用物理学];
学科分类号
摘要
Bulk samples of holmium and ytterbium rare earth titanates doped with yttrium and bismuth were synthesized. To study the magnetic properties and peculiarities of magnetic interaction in doped and undoped titanates, magnetization curves and temperature dependences of the susceptibility were measured in fields up to 3 T at temperatures from 2 to 300 K. Magnetic properties for doped and undoped titanates with different doping level, as well as doped with different elements, have been compared. Based on study of temperature dependences of the susceptibility, magnetic dipole and exchange interactions have been analyzed. In the case of undoped holmium titanate, the dominant magnetic interaction type has been found to be the dipole one. When doping of holmium titanate with yttrium and bismuth, the magnetic interactions between the rare earth ions are sharply weak. Undoped ytterbium titanates have shown a predominance of the superexchange interaction. Presence of a large number of randomly distributed yttrium or bismuth ions, which occupy positions of ytterbium ions in crystal lattice, leads to the decrease in concentration of R3+-O-R3+ ion pairs in this rare earth titanate, between which there is superexchange. Therefore, in doped compounds, the magnetic dipole interaction capable to act at large distances contrary to the superexchange one begins to predominate. The values of the g-factor have been estimated by the fit of the measured magnetization curves.
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收藏
页码:1465 / 1474
页数:10
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