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211.
Kawasaki S Mito T Kawasaki Y Zheng GQ Kitaoka Y Aoki D Haga Y Onuki Y 《Physical review letters》2003,91(13):137001
We report systematic measurements of ac susceptibility, nuclear-quadrupole-resonance spectrum, and nuclear-spin-lattice-relaxation time (T1) on the pressure (P)-induced heavy-fermion superconductor CeRhIn5. The temperature (T) dependence of 1/T(1) at P=1.6 GPa has revealed that antiferromagnetism (AFM) and superconductivity (SC) coexist microscopically, exhibiting the respective transition at T(N)=2.8 K and T(MF)(c)=0.9 K. It is demonstrated that SC does not yield any trace of gap opening in low-lying excitations below T(onset)(c)=2 K, but T(MF)(c)=0.9 K, followed by a T(1)T=const law. These results point to the unconventional characteristics of SC coexisting with AFM. We highlight that both of the results deserve theoretical work on the gapless nature in the low-lying excitation spectrum due to the coexistence of AFM and SC and the lack of the mean-field regime below T(onset)(c)=2 K. 相似文献
212.
Mito T Kawasaki S Kawasaki Y Zheng GQ Kitaoka Y Aoki D Haga Y Onuki Y 《Physical review letters》2003,90(7):077004
We report a study on the interplay between antiferromagnetism (AFM) and superconductivity (SC) in a heavy-fermion compound CeRhIn5 under pressure P=1.75 GPa. The onset of the magnetic order is evidenced from a clear split of 115In nuclear quadrupole resonance spectrum due to the spontaneous internal field below the Néel temperature T(N)=2.5 K. Simultaneously, bulk SC below T(c)=2.0 K is demonstrated by the observation of the Meissner diamagnetism signal whose size is the same as in the exclusively superconducting phase. These results indicate that the AFM coexists homogeneously with the SC at a microscopic level. 相似文献
213.
Masa-aki Sato 《Physics letters. [Part B]》1982,113(4):315-319
Master fields are formulated for finite-N QCD3+1. They satisfy classical Yang-Mills equations with an infinite number of internal indices and an infinite number of constraints. In the large-N limit explicit solutions for these constraints are given and used as trial functions in the Hartree-Fock variational calculation which should be a good approximation for the study of gluon condensation effects in the QCD3+1-vacuum. 相似文献
214.
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216.
A wavelength-calibration method for prism-based spectral imaging of single-molecule (SM) fluorescence was developed. With
this method, a wavelength reference is provided by photoluminescence from 50-nm-diameter gold nanoparticles (AuNPs) binding
with fluorophores. The AuNPs each bound with a SM fluorophore, either Alexa488 or Cy3, to form AuNP/fluorophore complexes
in tris-HCl buffer. Each complex was immobilized on a silica slide and then excited by total-internal-reflection illumination
to make it emit SM fluorescence and AuNP photoluminescence. The portion of the AuNP photoluminescence transmitted by a band-pass
filter gives the wavelength reference. A spectral-imaging system composed of a prism-based spectroscope (with a reciprocal
dispersion of about 4 nm/μm) and a charge-coupled device with 6.45-μm-square pixels was used to obtain an SM-fluorescence
spectrum and a wavelength-reference spectrum. Through smoothed differentiation of these two spectra, the peak location of
the former in relation to the latter was determined with subpixel precision. After that, the SM fluorophore was classified
as either Alexa488 or Cy3 according to the peak location. The error rate of the classification was estimated to be only 0.3%. 相似文献
217.
研究了由未端化支化聚酰胺、交联剂(MBHP)和光酸产生剂(PTMA)所组成的三元负型光敏聚合物体系.其中,不对称ABB′型单体4-(2,4-二氨基苯氧基)苯甲酸3在亚磷酸三苯酯(TPP)和吡啶(Py)的存在下,通过缩合聚合得到支化聚酰胺a,由其1H-NMR数据计算得支化度(DB)为0.36.接着用肉桂酰氯对支化聚酰胺进行末端化.采用IR,1H-NMR,GPC,TG/DTA对支化聚酰胺和末端化支化聚酰胺b的结构和性能进行了表征.由85wt%末端化支化聚酰胺b、10wt%交联剂(MBHP)和5wt%光酸产生剂(PTMA)所组成的光敏聚合物体系,在100℃预烘10min,采用436nm(g-line)紫外光曝光,随后在25℃于二甲基甲酰胺中显影10s,用水漂洗,110℃后烘3min后,得到负型图案,边界清晰且分辨率达40μm. 相似文献
218.
219.
In this paper, hyperbranched polyimides having the same repeating unit were synthesized by employing ideal A2+B3 polymerization, non-ideal A2+B3 polymerization and AB2 self-polymerization methods. The polymerization behavior, polymer properties were compared for three methods. Hyperbranched polyimides by ideal A2+B3 polymerization, non-ideal A2+B3 polymerization and AB2 self-polymerization methods show apparent difference in many physical properties, such as inherent viscosity, glass transition temperature, and film formation behavior etc. The hyperbranched polymers by the non-ideal A2+B3 polymerization are suitable for smooth, flexible and self-standing film preparation, which provides useful information for hyperbranched polymers toward self-standing materials. 相似文献
220.