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排序方式: 共有107条查询结果,搜索用时 15 毫秒
1.
Journal of Experimental and Theoretical Physics - The nature of the training effect in exchange-biased compounds is studied. This effect consists in a decrease in the exchange bias field (HEB)... 相似文献
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S. P. Dolin A. A. Levin T. Yu. Mikhailova N. S. Strokach M. V. Solin E. V. Polyakov 《Journal of Molecular Structure》2004,700(1-3):199-205
An effect of molecular vibrational modes within the dimers [O3AO–(H/D)OAO3]3− on behavior of H-bond protons or deuterons is studied theoretically for H-bonded antiferroelectrics and quantum paraelectrics of the M3(H/D)(AO4)2 family (M=alkali metal, A=S, Se). The ‘heavy’ reorganization modes in D-species of this family and both reorganization and promoting modes in corresponding H-analogues are examined. It is shown that the analysis with due regard for the reorganization modes results in insignificant decreasing of the effective tunneling frequency of light nuclei. Hence the reasonable estimations of the critical temperature of the low-temperature phase transition in M3D(AO4)2 materials are available only with additional corrections related to potential profiles of a deuteron. It is noted that in the limits of the proposed model the promoting mode in the case of H-species can favor, in principle, the increasing as well as the decreasing of effective proton level splitting. 相似文献
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N. I. Solin L. N. Romashev S. V. Naumov A. A. Saranin A. V. Zotov D. A. Olyanich V. G. Kotlyar O. A. Utas 《Technical Physics》2016,61(2):233-239
We consider methods for controlling magnetoresistive parameters of magnetic metal superlattices, manganites, and magnetic semiconductors. By reducing the thickness of ferromagnetic layers in superlattices (e.g., Fe layers in Fe/Cr superlattices), it is possible to form superparamagnetic clustered–layered nanostructures with a magnetoresistance weakly depending on the direction of the external magnetic field, which is very important for applications of such type of materials. Producing Mn vacancies and additionally annealing lanthanum manganites in the oxygen atmosphere, it is possible to increase their magnetoresistance by more than four orders of magnitude. By changing the thickness of p–n junction in the structure of ferromagnetic semiconductors, their magnetoresistance can be increased by 2–3 orders of magnitude. 相似文献
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Physics of the Solid State - The resistance of single-crystal La1.2Sr1.8Mn2(1 – z)O7 is studied experimentally and theoretically in the 75–300 K temperature range in... 相似文献
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N. I. Solin V. A. Kazantsev L. D. Fal’kovskaya S. V. Naumov 《Physics of the Solid State》2005,47(10):1900-1908
Variations in the thermopower, electrical resistivity, magnetoresistance, thermal expansion coefficients, and their anisotropy with temperature were detected near room temperature in single crystals of weakly doped lanthanum manganites La1?xAxMnO3 (A = Ca, Sr; x = 0.07–0.125) with orthorhombic structure. The results obtained are discussed in terms of a model of phase separation related to polaron anisotropy. Due to a gain in exchange and elastic energies in the lattice, small-radius magnetic polarons can merge to form polarons of a larger size, which would contain now not one but rather a few electrons (equal in number to the polarons in the cluster). As a result, short-range order in a cluster and phase separation set in at a temperature Tps ≈ 250–300 K, which is approximately equal to the Curie temperature TC of conducting manganites with x ≈ 0.2–0.3. 相似文献
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S. F. Dubunin V. E. Arkhipov S. G. Teploukhov V. D. Parkhomenko N. N. Loshkareva N. I. Solin 《Physics of the Solid State》2003,45(12):2297-2302
The magnetic state of the manganite La0.93Sr0.07MnO3 in the range 4.2–290 K was studied using elastic neutron scattering. The magnetic state of this compound was found to occupy a particular place in the La1?xSrxMnO3 solid-solution system, in which the antiferromagnetic type of order (LaMnO3, TN=139.5 K) switches to ferromagnetic ordering (La0.9Sr0.1MnO3, TC=152 K) with increasing x. In the transition state, this compound contains large-scale spin configurations of two types. A fractional crystal volume of about 10% is occupied by regions of the ferromagnetic phase with an average linear size of 200 Å, while the remainder of the crystal is a phase with a nonuniform canted magnetic structure. Arguments are presented for the phase separation of the La0.93Sr0.07MnO3 spin system being accounted for by Mn4+ ion ordering. 相似文献
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Teija Koivula Jaana Laine Tiina Lipponen Outi Perhola Eeva-Liisa K?m?r?inen Kim Bergstr?m Olof Solin 《Journal of Radioanalytical and Nuclear Chemistry》2010,286(3):841-846
The serotonin receptor 5-HT1A ligand 4-[18F]fluoro-N-[2-[1-(2-methoxyphenyl)-1-piperazinyl]ethyl-N-2-pyridinyl-benzamide (p-[18F]MPPF) was produced by a simplified method of Le Bars et al. Traditional oil bath heating was compared to microwave heating.
Various radioanalytical methods, radio-Thin Layer Chromatography (TLC), High Pressure Liquid Chromatography (HPLC) and Mass
Spectrometry (MS), were compared in the evaluation of the labelled product(s). The crude reaction mixture consisted of p-[18F]MPPF and 2–4 radioactive by-products eluting after the product fraction, and the reverse-phase HPLC method failed occasionally
to separate p-[18F]MPPF from the radioactive by-product with close retention time. The heating method had no significant effect on the composition
of labelled by-products. In LC-(ESI)-MS analysis of p-[18F]MPPF the labelled product was identified with m/z ratio of 435 ([M + H+]). The other HPLC fractions were measured to have following m/z ratios: (1) 327; 349; (675) (2) 402; 407/408; (791) and (3) 436, suggesting different kind of decomposition of the labelled
product and/or the inactive precursor. The ion trap mass spectrometer was sufficient for the qualitative analysis of p-[18F]MPPF. However, differentiation of by-products arising from the decomposition of p-[18F]MPPF or from its precursor p-MPPNO2 proved to be challenging. 相似文献