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本文对钙钛矿型晶体的电光及倍频效应的机理提出了一个(MO6)离子基团模型。并从(TiO6)离子基团的准分子轨道及晶格场位能作用下的(TiO6)离子基团的离子键轨道出发,利用ABDP理论,分别计算了BaTiO3的各个电光及倍频系数。计算结果表明,在没有引入任何可调整参量的情况下,用(TiO6)离子基团的晶格场理论所得到的电光及倍频系数的计算值和实验值符合得相当好,而准分子轨道对这些效应的贡献很小。由 相似文献
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本文再次采用氧八面体基团模型及定域化轨道波函数的方法系统地计算了九种钙钛矿、钨青铜型和LiNbO3型晶体的折射率。在未引入任何可调整参量的情况下,计算值与实验值之差仅10%左右。由此可见,氧八面体基团模型及定域化轨道波函数的计算方法不但能在定量上阐明这两种类型材料的电光和非线性光学效应的机理,同时也能阐明光频线性极化率的各种性质。本文的计算还表明,虽然奇次项晶格场是晶体产生电光和非线性光学效应的决定因素,但对线性极化率的影响恰非常小。最后,就定域化轨道方法的可靠性作了某些讨论。 相似文献
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Common Features in Electronic Structure of the Oxypnictide Superconductors from Photoemission Spectroscopy 下载免费PDF全文
贾小文 ;刘海云 ;张文涛 ;赵林 ;孟建桥 ;刘国东 ;董晓莉 ;吴刚 ;刘荣华 ;陈仙辉 ;任治安 ;衣纬 ;车广灿 ;陈根富 ;王楠林 ;王桂玲 ;周永 ;朱镛 ;王晓阳 ;赵忠贤 ;许祖彦 ;陈创天 ;周兴江 《中国物理快报》2008,25(10):3765-3768
High resolution photoemission measurements are carried out on non-superconducting LaFeAsO parent com- pound and various superconducting RFeAs(O1-ZFx) (R=La, Ce and Pr) compounds. It is found that the parent LaFeAsO compound shows a metallic character. By extensive measurements, several common features are identified in the electronic structure of these Fe-based compounds: (1) 0.2 eV feature in the valence band, (2) a universal 13-16 meV feature, (3) near EF spectral weight suppression with decreasing temperature. These uni- versal features can provide important information about band structure, superconducting gap and pseudogap in these Fe-based materials. 相似文献
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Disappearance of Superconductivity and a Concomitant Lifshitz Transition in Heavily Overdoped Bi_2Sr_2CuO_6 Superconductor Revealed by Angle-Resolved Photoemission Spectroscopy 下载免费PDF全文
丁颖 赵林 闫宏涛 高强 刘静 胡成 黄建伟 李聪 徐煜 蔡永青 戎洪涛 吴定松 宋春尧 周花雪 董晓莉 刘国东 王庆艳 张申金 王志敏 张丰丰 杨峰 彭钦军 许祖彦 陈创天 周兴江 《中国物理快报》2019,(1)
By partially doping Pb to effectively suppress the superstructure in single-layered cuprate Bi_2Sr_2CuO_(6+δ)(Pb-Bi2201) and annealing them in vacuum or in high pressure oxygen atmosphere, a series of high quality Pb-Bi2201 single crystals are obtained with T_c covering from 17 K to non-superconducting in the overdoped region. High resolution angle resolved photoemission spectroscopy measurements are carried out on these samples to investigate the evolution of the Fermi surface topology with doping in the normal state. Clear and complete Fermi surfaces are observed and quantitatively analyzed in all of these overdoped Pb-Bi2201 samples. A Lifshitz transition from holelike Fermi surface to electron-like Fermi surface with increasing doping is observed at a doping level of ~0.35. This transition coincides with the change that the sample undergoes superconducting-to-non-superconducting states.Our results reveal the emergence of an electron-like Fermi surface and the existence of a Lifshitz transition in heavily overdoped Bi2201 samples. This provides important information in understanding the connection between the disappearance of superconductivity and the Lifshitz transition in the overdoped region. 相似文献
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Detailed electronic structure of three-dimensional Fermi surface and its sensitivity to charge density wave transition in ZrTe_3 revealed by high resolution laser-based angle-resolved photoemission spectroscopy 下载免费PDF全文
The detailed information of the electronic structure is the key to understanding the nature of charge density wave(CDW) order and its relationship with superconducting order in the microscopic level. In this paper, we present a high resolution laser-based angle-resolved photoemission spectroscopy(ARPES) study on the three-dimensional(3 D) hole-like Fermi surface around the Brillouin zone center in a prototypical quasi-one-dimensional CDW and superconducting system ZrTe_3. Double Fermi surface sheets are clearly resolved for the 3 D hole-like Fermi surface around the zone center. The3 D Fermi surface shows a pronounced shrinking with increasing temperature. In particular, the quasiparticle scattering rate along the 3 D Fermi surface experiences an anomaly near the charge density wave transition temperature of ZrTe_3(~ 63 K). The signature of electron–phonon coupling is observed with a dispersion kink at ~ 20 me V; the strength of the electron–phonon coupling around the 3 D Fermi surface is rather weak. These results indicate that the 3 D Fermi surface is also closely connected to the charge-density-wave transition and suggest a more global impact on the entire electronic structure induced by the CDW phase transition in ZrTe_3. 相似文献