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51.
在凝聚态物理研究中, 压力作为对物质状态调控的独立变量得到了广泛的应用. 压力对发现物质的新现象、新规律及对其形成机理的理解和对相关理论的验证起到了重要的作用, 尤其在超导电性的研究中取得了巨大的成功. 文章简要的介绍了通过利用压力手段对具有相分离结构的碱金属铁硒基超导体AxFe2-ySe2 (A=K, Rb, Tl/Rb)开展的系列研究所取得的实验结果, 以及其他一些文献中报道的在此方面的主要实验与理论研究工作, 包括压力导致的超导再进入现象和其产生的量子临界机理、其特有的反铁磁绝缘体相在该类超导体实现超导电性中的作用、化学负压力对超导电性的影响、构成该类超导体的反铁磁序与其寄居的超晶格的关系等. 相似文献
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The title compound formulated as Cu2(C13H11N6OF2)(N3)3CH3OH was synthesized and structurally characterized by elemental analysis,IR and single-crystal X-ray diffraction.In the structure of the complex,the deprotonated fluconazole and azide anion link two copper centers to construct a binuclear SBU and the azide anion exhibits a μ1,1-coordination mode.Each triazole group of fluconazole links two SBUs and the compound exhibits a chain-like architecture with strong antiferromagnetism. 相似文献
54.
A new magnetic regime is presented in hematite hollow spheres. The numerous dangling bonds, formed in the H+ etching process during fabrication, endow the surfaces of the primary particles with paramagnetic and ferrimagnetic attributes. The freezing and coupling of these surface states have profound effect on the magnetic performance of the host hematite spheres – including enhanced ferromagnetism, a peculiar variation of thermal remanent magnetization, and an exchange bias training effect, which may find their potential applications in spintronic fields. (© 2012 WILEY‐VCH Verlag GmbH & Co. KGaA, Weinheim) 相似文献
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Hongyang Zhao Hideo Kimura Zhenxiang Cheng Xiaolin Wang Kiyoshi Ozawa Takashi Nishida 《固体物理学:研究快报》2010,4(11):314-316
Single phase Bi2FeMnO6 films on (100) SrTiO3 substrate were fabricated using a pulsed laser deposition method through optimization of the preparation conditions. The magnetic moment is 0.30μB at 5 K in the magnetic field of 1 T, indicating that B site cations of Fe and Mn are disordered in the sample. The zero‐field‐cooling (ZFC) and field‐cooling (FC) magnetization curves measured from 2 K to 400 K coincide at 360 K. This is consistent with the observation that hysteresis disappears at 360 K, revealing the antiferromagnetic transition at this temperature. A spin‐glass‐like behaviour was observed at low temperature (~100 K) with a cusp of 25 K. Mn shows multiple valence states in the film. It is possibly because Mn2+ and Mn4+ could decrease the Jahn–Teller effect from Mn3+ in the film which results in less lattice distortion. (© 2010 WILEY‐VCH Verlag GmbH & Co. KGaA, Weinheim) 相似文献
57.
合成了含水配合物[Co(py)4Cl2]·H2O。分析了其单晶结构并与已知的无水配合物Co(py)4Cl2作了比较。发现结晶水的存在使含水配合物晶胞及分子对称性下降,由4方晶系I41/acd空间群变为单斜晶系P21/n空间群。并且水分子通过氢键作用把[Co(py)4Cl2]联接成一维长链。用Curie-Weiss定律,零场分裂磁化率公式加分子场校正磁化率公式拟合变温磁化率数据,发现分子间存在弱的反铁磁性交换作用。用Fisher一维线性链模型磁化率公式拟合,得出其氢键链内交换常数约为-1.03K。 相似文献
58.
L. Shlyk 《Journal of solid state chemistry》2011,184(12):3158-3162
Single crystals of the novel compound BaSn6Co6O19 with maximum width 1 mm and thickness around 0.05 mm were grown from a barium chloride flux. The composition was determined from refinements of single crystal X-ray diffraction data and microprobe analysis. BaSn6Co6O19 crystallizes in the magnetoplumbite type structure (hexagonal, space group P63/mmc, a=6.0940(1) Å, c=23.9633(5) Å, V=770.69 Å3, Z=2). A significant disorder is generated by random occupation of two octahedrally coordinated crystallographic sites with Co2+ and Sn4+ ions, while further sites are exclusively occupied by either Co2+ (tetrahedrally coordinated) or Sn4+ (octahedrally coordinated). One site with mixed occupation realizes the topology of a kagome net. The temperature dependence of the magnetic susceptibility for a single crystal BaSn6Co6O19 reveals a low temperature antiferromagnetic order at TN=14 K. A relatively large value of frustration factor f//=|ΘW//|/TN≈26 and f⊥=|ΘW⊥|/TN≈12 implies a frustrated antiferromagnetism. 相似文献
59.
The effect of the extra second neighbor hopping t‘ on the incommensurate spin correlation in the t-J modelin the underdoped regime is studied within the fermion-spin theory. It is shown that although the extra second neighborhopping t‘ is systematically accompanied with the increasing of the weight of the incommensurate peaks in the dynamicalspin structure factor, for the physical reasonable small value of t‘ the qualitative behavior of the incommensurate spincorrelation in the t-t‘-J model is the same as in the case of t-J model. 相似文献
60.
A. I. Figueroa S. E. Harrison L. J. Collins‐McIntyre G. van der Laan T. Hesjedal 《固体物理学:研究快报》2016,10(6):467-470
We investigate the magnetic properties of Ho‐doped Bi2Te3 thin films grown by molecular beam epitaxy. Analysis of the polarized X‐ray absorption spectra at the Ho M5 absorption edge gives an effective 4f magnetic moment which is ~45% of the Hund's rule ground state value. X‐ray magnetic circular dichroism (XMCD) shows no significant anisotropy, which suggests that the reduced spin moment is not due to the crystal field effects, but rather the presence of non‐magnetic or antiferromagnetic Ho sites. Extrapolating the temperature dependence of the XMCD measured in total electron yield and fluorescence yield mode in a field of 7 T gives a Curie–Weiss temperature of ?CW ≈ –30 K, which suggests antiferromagnetic ordering, in contrast to the paramagnetic behavior observed with SQUID magnetometry. From the anomaly of the XMCD signal at low temperatures, a Néel temperature TN between 10 K and 25 K is estimated. (© 2016 WILEY‐VCH Verlag GmbH &Co. KGaA, Weinheim) 相似文献