Magnetic susceptibility of pyrochlores R2Ti2O7: R = Gd, Dy, Tb

被引：3
|
作者：
Kuznetsov, A., V [1 ,2 ]
Churkin, O. A. [1 ]
Ivanov, A. A. [1 ]
Popov, V. V. [1 ,2 ]
Alekseev, P. A. [1 ,2 ]
Menushenkov, A. P. [1 ]
机构：
[1] Natl Res Nucl Univ MEPhI, Moscow Engn Phys Inst, Moscow 115409, Russia
[2] Natl Res Ctr, Kurchatov Inst, Moscow 123182, Russia
来源：
JOURNAL OF MAGNETISM AND MAGNETIC MATERIALS | 2020年 / 500卷
基金：
俄罗斯科学基金会;
关键词：
Frustrated magnetism; Pyrochlore antiferromagnet; Crystal field; Exchange interaction; Magnetic susceptibility; RARE-EARTH COMPOUNDS; CRYSTAL-FIELD; FRUSTRATED GD2SN2O7; LN(2)TI(2)O(7) LN; TEMPERATURE; MODEL; STATE; ICE;
D O I：
10.1016/j.jmmm.2019.166326
中图分类号：
T [工业技术];
学科分类号：
08 ;
摘要：
We present the study of magnetic susceptibility of pyrochlores Gd2Ti2O7, Dy2Ti2O7 and Tb2Ti2O7 which belong to frustrated magnets. The temperature dependence of the susceptibility chi(T) of powder samples was measured in the temperature range from 4.2 to 300 K and analyzed in the framework of mean field approximation taking into account both crystal field effects and anisotropy of the exchange interaction. We developed a simple approach allowing us to estimate interaction energies of magnetic ions from chi(T) dependences and data on wave functions of the crystal-field states of the ions using a minimum number of fitting parameters. We revealed a strong anisotropy of the exchange interaction in the paramagnetic state of Gd2Ti2O7 and obtained nearest-neighbor effective bond energies of the magnetic ions in Tb2Ti2O7 and Dy2Ti2O7 which are in good agreement with the temperatures of formation of the spin-ice state in these compounds.
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页数：9
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