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Bai Zhen Wang Qi Xu Hushan Wang Meng Wang Jiansong Hu Zhengguo Han Jianlong Chen Ruofu Zhang Xueyin Sun Zhiyu Tu Xiaolin Yue Ke Yang Yanyun Yao Xiangwu Huang Meirong Tang Bin Zhang Yapeng Zhang Xueheng Wu Dapeng Qiu Hao Chin Jinda Zang Yongdong Li Dehui Zhang Jie Xu Zhiguo Xiao Guoqing 《近代物理研究所和兰州重离子加速器实验室年报》2007,(1)
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The magnetization curves along the crystal axes for Gd_2Fe_{17} and Gd_2Fe_{17}H_3 were analysed based on the single-ion model. If the Gd-Fe exchange interaction has been taken as isotropic as usual, the fitted values of magneto-crystalline anisotropy of the Fe sublattices in Gd_2Fe_{17} and Gd_2Fe_{17}H_3 would become unreasonably different from those of the corresponding Y or Lu compounds. It was shown that the large difference is caused by the neglect of the anisotropy of the Gd-Fe exchange interaction. 相似文献
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D. Hojman M.A. Cardona D.R. Napoli S.M. Lenzi C.A. Ur G. Lo Bianco C.M. Petrache M. Axiotis D. Bazzacco J. Davidson M. Davidson M. De Poli G. de Angelis E. Farnea T. Kroell S. Lunardi N. Marginean T. Martınez R. Menegazzo B. Quintana C. Rossi Alvarez 《The European Physical Journal A - Hadrons and Nuclei》2001,10(3):245-248
High-spin states in 178Ir were investigated by means of in-beam γ-ray spectroscopy techniques using the multidetector array GASP. Excited states
of 178Ir were populated through the 159Tb(24Mg, 5n) fusion-evaporation reaction at E(24
Mg) = 131-141 MeV. Several rotational bands were observed. Among them, the πi
13/2⊗νi
13/2 structure has been identified up to spin 36 ?. This band exhibits an anomalous signature splitting and a signature inversion
around spin 25 ?.
Received: 13 December 2000 / Accepted: 11 April 2001 相似文献
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S. H. Ge M. X. Mao Z. H. Cheng C. X. Li J. J. Sun F. S. Li Q. Lin 《Hyperfine Interactions》1993,78(1-4):445-449
Y2Fe17–x
Si
x
compounds withx=0, 0.5, 1.0, 1.5, 2.0, 2.5 and3.0 were investigated by magnetic measurement andNMR. It is found that with increasing Si content the Curie temperatureT
C increases while the average Fe magnetic moment Fe decreases. NMR study indicates that Si preferentially substitute the Fe atoms at 4f sites, which is responsible for the increase ofT
C. 相似文献
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E. I. Lakhno E. I. Burmakin I. V. Korzun G. Sh. Shekhtman 《Physics of the Solid State》2012,54(3):504-507
The rubidium monoferrite RbFeO2-based solid solutions with the composition Rb2 − 2x
Fe2 − x
P
x
O4 have been synthesized, and their crystal structure and the temperature and concentration dependences of the total and electron
conductivities have been studied. The introduction of P5+ ions has been found to sharply decrease the electron conductivity that prevails in pure rubidium monoferrite and, at the
same time, to increase the ionic conductivity. The latter becomes dominant as the phosphorus concentration increases. The
maximum rubidium-cation conductivity of the materials under study is ∼3 × 10−2 S/cm at 300°C and ∼3 × 10−1 S/cm at 700°C. The results have been compared with the previously obtained data for similar solid solutions based on rubidium
monogallate and monoaluminate. 相似文献
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Lü Hong-Feng 《中国物理快报》2007,24(9):2547-2551
Hypernuclear magnetic moment and λ--N interaction in 17λO has been studied within relativistic mean field theory. Without core polarization, the relativistic results are found to fit the Schmidt value well and not be sensitive to λ--N interaction. The relativistic magnetic moment is enhanced with nearly equal contributions of the relativistic and free masses. When λ hyperon occupies the l=0 or l=1 orbit, the effect of λ--N interaction on the magnetic moment of valence proton is different. 相似文献
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ZHANG Jian-Bo TANG Ling-Yun ZHANG Jiang QIN Zhen-Xing ZENG Xiao-Jing LIU Jing WEN Jin-Sheng XU Zhi-Jun GU Genda CHEN Xiao-Jia 《中国物理C(英文版)》2013,37(8):088003-0880
The high-pressure structures of an underdoped cuprate superconductor Bi2Sr2CaCu2O8+δ have been studied by synchrotron X-ray diffraction at pressures up to 36.5 GPa. We find that this superconductor retains its orthogonal structure with the space group Amaa in the pressure range studied. Upon compression, both the a and b axes first shrink monotonically up to 17.4 GPa from their ambient pressure values and keep these behaviors with positive compressibilities up to 36.5 GPa after experiencing expansion with negative compressibilities in the pressure regime between 17.4 and 23.7 GPa. However, the c axis decreases continuously with increasing pressure with a slow change at about 23.7 GPa. The results indicate an isostructural phase transition starting at 17.4 GPa and a structural collapse at around 23.7 GPa. 相似文献
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Y.H. Zhang M. Oshima Y. Toh M. Koizumi A. Osa T. Shizuma T. Hayakawa M. Sugawara H. Kusakari T. Morikawa S.X. Wen L.H. Zhu 《The European Physical Journal A - Hadrons and Nuclei》2002,13(4):429-433
The 109,111,113Rh nuclei have been produced as fission fragments in the fusion reaction 18O + 208Pb at 85 MeV. Their level schemes have been built from gamma-rays detected using the Euroball IV array. High-spin states of
the neutron-rich 111,113Rh nuclei have been identified for the first time. Several rotational bands with the odd proton occupying the πg
9/2, πp
1/2 and π(g
7/2/d
5/2) sub-shells have been observed. A band of low-energy transitions has been identified at excitation energy around 2 MeV in
109,111Rh, which can be interpreted in terms of three-quasiparticle excitation, πg
9/2νh
11/2νg
7/2/d
5/2. In addition another structure built on states located at low excitation energy (608 keV in 111Rh, 570 keV in 113Rh) points out that, as already observed in the lighter isotopes 107,109Rh, triaxial deformation plays a role in the neutron-rich Rh isotopes well beyond the mid-shell.
Received: 15 July 2002 / Accepted: 9 October 2002 / Published online: 3 December 2002
RID="a"
ID="a"e-mail: porquet@csnsm.in2p3.fr
RID="b"
ID="b"Present address: CSNSM IN2P3-CNRS and Université Paris-Sud 91405 Orsay, France.
RID="c"
ID="c"Present address: CEA/Saclay, DSM/DAPNIA/SPhN, 91191 Gif-sur-Yvette Cedex, France.
Communicated by D. Schwalm 相似文献
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讨论了利用分子场近似结合中子衍射或X射线衍射的实验结果计算R2Fe17型稀土过渡族化合物中稀土磁矩与过渡族磁矩之间交换耦合常量的方法,并据此计算了R2Fe17-xAlx(R=Tb,Dy,Ho,Er,Gd,x=7或8)化合物中稀土磁矩与过渡族磁矩之间的交换耦合常量.计算结果与实验值符合较好.
关键词:
2Fe17-xAlx化合物')" href="#">R2Fe17-xAlx化合物
交换耦合常量 相似文献
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Marco Bisaglia Elisa Greggio Dragan Maric David W Miller Mark R Cookson Luigi Bubacco 《BMC neuroscience》2010,11(1):41
Background
Oxidative stress has been proposed to be involved in the pathogenesis of Parkinson's disease (PD). A plausible source of oxidative stress in nigral dopaminergic neurons is the redox reactions that specifically involve dopamine and produce various toxic molecules, i.e., free radicals and quinone species. α-Synuclein, a protein found in Lewy bodies characteristic of PD, is also thought to be involved in the pathogenesis of PD and point mutations and multiplications in the gene coding for α-synuclein have been found in familial forms of PD. 相似文献16.
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Intensity and composition-dependent sign reversal of non-linearity in TiO2/CeO2 nanocomposites 下载免费PDF全文
CeO2/TiO2 composite nanoparticles with different Ce/Ti molar ratios have been successfully synthesized via sol-gel method. It was found that the band gap of the nanocomposite is tunable by varying Ce/Ti content. The nonlinear response of the sample was studied by using the nanosecond laser pulses from a Q switched Nd:Yag laser employing the Z-scan method. Open aperture Z-scan experiment revealed that with the increase in the CeO2 amount in the nanocomposite, the non-linearity of the composite increases, and it was assumed that this could be due to the modification of TiO2 dipole symmetry by the addition of CeO2. Closed aperture Z-scan experiment showed that when the CeO2 amount increases, positive nonlinear refraction decreases, and this could be attributed to the increase in the two photon absorption which subsequently suppresses the nonlinear refraction. 相似文献
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CAO Ning WEI Yan-Feng ZHAO Ji-Min ZHAO Shi-Ping YANG Qian-Sheng ZHANG Zhi-Guo FU Pan-Ming 《中国物理快报》2008,25(6):2257-2260
Quasiparticle dynamics of an optimally doped Bi2Sr2CaCu2O8+δ single crystal is investigated by the femtosecond pump--probe technique. Temperaturedependences of amplitude of the photoinduced differential reflectivity and the relaxation time show the evidence of strong phonon bottleneck. The experimental results are analysed by the Rothwarf--Taylor model. 相似文献
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A KisselB Sumpf H.-D KronfeldtB.A Tikhomirov Yu.N Ponomarev 《Journal of Molecular Spectroscopy》2002,216(2):345-354
The pressure-induced shift and broadening of H2S absorption lines in the ν2-band due to collisions between H2S molecules and quadrupole molecules, such as O2, H2, D2, N2, and CO2, were studied in the spectral region between 1050 and 1325 cm−1. The measurements were carried out using a pulse-driven diode laser spectrometer with two multipass Herriott cells. The data concerning the collisional broadening and shift coefficients, γ and δ, respectively, and their dependencies on the rotational quantum number J″ and the quadrupole moment Q of the molecular perturber are presented for 14 P-branch transitions (3≤J″≤8,0≤KaPrime;≤3, 2≤KcPrime;≤8), 7 Q-branch transitions (7≤JPrime;≤10, 1≤KaPrime;≤2, 6≤KcPrime;≤9), and 18 R-branch transitions (2≤JPrime;≤11, 0≤KaPrime;≤4, 0≤KcPrime;≤11). The broadening coefficients γ were determined with an accuracy to within 2% and shift coefficients δ were determined with an uncertainty of less than 10−3 cm−1/atm for the majority of lines and broadening gases. 相似文献