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Zai-Chun Xu Mei-Feng Liu Lin Lin Huimei Liu Zhi-Bo Yan Jun-Ming Liu 《Frontiers of Physics》2014,9(1):82-89
Double pyrochlore Dy2Ru207 is synthesized and its magnetism and ferroelectricity below the Ru4+ spin ordering temperature (NI00 K) are investigated. The ferroelectric transition appears at -18 K, much higher than the Dy3+ spin ordering point at -1.8 K and lower than the Ru4+ spin ordering point at -100 K. The measured electric polarization at ,-2 K is as big as 145℃/m2 in the polycrystalline samples. It is argued that the ferroelectricity is possibly ascribed to the electric dipole ordering arising from the collective monopole excitations in the Dy3+ tetrahedrons in prior to the Dy3+ spin ordering into spin-ice like state below -1.8 K. 相似文献
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科研工作使科学内容现代化——将电流变液转变机理及其应用引入工科物理 … 总被引:2,自引:0,他引:2
介绍了科研工作(电流变液转变机理及其应用)引入工科物理教学的实践与体会。 相似文献
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The magnetoelectric properties of A- or B-site-doped PbVO3 films: A first-principles study 下载免费PDF全文
We employ first-principles calculations to study the magnetic and ferroelectric properties of PbVO3 with A (XA = Ca, Sr, Bi, Ba, and La) or B (XB = Ti, Cr, Mn, Fe, Co, Ni, and Cu) site dopants, with the aim of ascertaining a large ferroelectric polarization and a long magnetic order, or even a macro fen'i/ferromagnetism, which is critical to their potential applications in magnetoelectronic devices. It is found that PbTXAVsO24 (XA =Ca, Sr, and Ba,) are inclined to maintain the spin glass and large ferroelectric polarization. The degenerated G- and C-antiferromagnetic (AFM) couplings in the ideal PbVO3 are broken up, accompanied by the loss of ferroelectric properties, when La or Bi is doped at the A site. In contrast, the above-mentioned 3d transition elements doped at the B site of PbVO3 could induce remnant magnetic moments and preserve the large ferroelectric polarization, except for Ni and Cu. The Fe or Cr at the B site clearly remove the degenerated G- and C-AFM coupling, but the nonmagnetic Ti cannot do so. For the Mn, Co, Ni, or Cu doped at the B sites, even the two-dimensional AFM ordering in PbVO3 is destabilized. The various doping effects are further discussed with inner strain and charge transfer. 相似文献
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玻璃掺杂量子点的倍频效应产生的理论研究 总被引:1,自引:0,他引:1
应用统计理论和量子力学理论对量子点掺杂的倍频效应产生的机制与量子点倍频光的电极化率与量子点的尺寸大小的关系进行了理论研究,结果较好地解释了实验所观察到的规律。 相似文献