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Effects of Electric field and Uniaxial Stress on Paramagnetic Spectra in Ferreoelectric Incommensurate phase and its Analyisi by Landau-Ishibashi Theoro.

电场和单轴应力对铁电不通约相顺磁谱的影响及其兰道-石桥理论分析。

基本信息

批准号：
61540248
负责人：
TADASHI Kobahasya
金额：
$ 0.7万
依托单位：
HOKURIKU UNIVERSITY
依托单位国家：
日本
项目类别：
Grant-in-Aid for General Scientific Research (C)
财政年份：
1986
资助国家：
日本
起止时间：
1986 至 1987
项目状态：
已结题

项目摘要

The Landau-Ishibashi theory was applied to interprete the temperature dependence of the magnetic resonance spectrum in the incommensutate and commensurate phases of A_2 BX_4 type crytals. Taking into accunt the local electric field and uniaxial stress at the probe sub-lattice, we domonstrated the systematic temperature change in the splitting and the shape of resonance lines and clearly reproduced the reported results in K_2 SeO_4 : SeO_4^-, The apparatus for applying uniaxial stress (Pressure and tension) and electric field used with EST spectrometer was developed. This appratus is characterized by perpendicular squeezer which si placed in the static magnetic fiels perpendicular to the applied stress and is rotated. Moreover the sample temperature can easily by changed by the cold ot hot gas blowing method. By using this apparatus we have observed the incommensurate domain switching of ferrroelastic substance such as LaNbo_4. We also obserbed the effect of electric field and uniazial stress on paramagnetic spectra in ferroelectric incommensurate phase in (N(CH_3)_4)_2CoCl_4 :Mn^<2+>.

用Landau-Ishibashi理论解释了A_2BX_4型晶体非共生相和公度相的磁共振谱随温度的变化规律。考虑到探针亚晶格上的局部电场和单轴应力，我们观测了分裂和共振线形状的系统温度变化，清楚地再现了K_2SeO_4：SeO_4^-中的报道结果，研制了用于EST光谱仪的单轴应力(压力和张力)和电场施加装置。这种装置的特点是垂直放置在垂直于外加应力的静磁场中并旋转。此外，冷吹法或热吹法可以方便地改变样品的温度。用该装置观察了LaNbO_4等铁弹性物质的无公度磁区转变，并观察了电场和单晶应力对(N(CH_3)_4)_2CoCl_4：Mn~(2+)&Gt~(2+)铁电无公度相顺磁谱的影响。