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61.
K. Sparta G.J. Redhammer P. Roussel G. Heger G. Roth P. Lemmens A. Ionescu M. Grove G. Güntherodt F. Hüning H. Lueken H. Kageyama K. Onizuka Y. Ueda 《The European Physical Journal B - Condensed Matter and Complex Systems》2001,19(4):507-516
A displacive, 2nd order structural phase transition at T
s
= 395 K from space group I
2 m below T
s
to I 4/m c m above T
s
has been discovered in the two-dimensional spin dimer compound SrCu2(BO3)2. The temperature evolution of the structure in both phases has been studied by X-ray diffraction and Raman scattering, supplemented
by differential scanning calorimetry and SQUID magnetometry. The implications of this transition and of the observed phonon
anomalies in Raman scattering for spin-phonon and interlayer coupling in this quantum spin system will be discussed.
Received 24 July 2000 and Received in final form 2 November 2000 相似文献
62.
We summarize the essential ingredients, which enabled us to derive the path-integral for a system of harmonically interacting spin-polarized identical particles in a parabolic confining potential, including both the statistics (Bose–Einstein or Fermi–Dirac) and the harmonic interaction between the particles. This quadratic model, giving rise to repetitive Gaussian integrals, allows to derive an analytical expression for the generating function of the partition function. The calculation of this generating function circumvents the constraints on the summation over the cycles of the permutation group. Moreover, it allows one to calculate the canonical partition function recursively for the system with harmonic two-body interactions. Also, static one-point and two-point correlation functions can be obtained using the same technique, which make the model a powerful trial system for further variational treatments of realistic interactions. 相似文献
63.
L.F. Lemmens F. Brosens J.T. Devreese 《The European Physical Journal B - Condensed Matter and Complex Systems》2003,31(2):195-202
A full analysis of domain structure using a micromagnetic model is developed in order to get a clear insight into the behaviour
of transverse initial susceptibility as a function of dc applied field for thin films and bilayers exhibiting both in-plane
and perpendicular anisotropy. The numerical simulations are in good agreement with available experimental results in case
of single layers with the so-called stripe domain pattern while some predictions are done for bilayers. As the main result,
it is shown that in low field, the transverse initial susceptible cannot be interpreted without the knowledge of the static
domain pattern while, above saturation, it is only affected by the in-plane anisotropy.
Received 10 October 2002 Published online 4 February 2003
RID="a"
ID="a"e-mail: ml@lpmtm.univ-paris13.fr
RID="b"
ID="b"UMR CNRS 8634 相似文献
64.
Abhinandan Makhal Pushpendra Kumar Peter Lemmens Samir Kumar Pal 《Journal of fluorescence》2010,20(1):283-290
The control of the spontaneous emission (SE) rate of dye molecules (4-dicyanomethylene-2-methyl-6-p-dimethylaminostyryl-4H-pyran
(DCM) and Coumarin 523 (C523)) embedded in the Porous Silicon (PS) matrix has been studied using picosecond resolved fluorescence
decay and polarization studies. We have shown that the SE rates of the two organic dyes embedded in the PS matrix depend on
the relative positions of the emission maxima of the dyes with respect to electronic band gap energy of the PS matrix. We
have also explored that the electronic band gap of the host PS matrix can easily be tuned by partial oxidation of the PS and
the nature of SE of the embedded dyes can be tuned accordingly. The demonstrated retardation or enhancement of the spontaneous
photon emission may enable the application of fluorescent organic molecules in PS matrix in several quantum optical devices
including the realization of single photon sources. 相似文献
65.
Brent Daelemans Samuel Eyley Carlos Marquez Vincent Lemmens Dirk E. De Vos Wim Thielemans Wim Dehaen Steven De Feyter 《Chemical science》2022,13(31):9035
Adsorptive separation is a promising lower-energy alternative for traditional industrial separation processes. While carbon-based materials have a long history in adsorptive removal of organic contaminants from solution or gas mixtures, separation using an adsorption/desorption protocol is rarely considered. The main drawbacks are the limited control in bulk adsorption experiments, as often all organic molecules are adsorbed, and lack of desorption methods to retrieve the adsorbed molecules. Using high-resolution on-surface characterization with scanning tunneling microscopy (STM), an increased understanding of the on-surface adsorption behavior under different conditions was obtained. The insight obtained from the nanoscale experiments was used to develop a highly selective separation method using adsorption and desorption on graphite, which was tested for the separation of quinonoid zwitterions. These experiments on adsorptive separation using self-assembly on graphite show its potential and demonstrate the advantage of combining surface characterization techniques with bulk experiments to exploit different possible applications of carbon-based materials.Insights from high-resolution on-surface characterization techniques are used to improve the control over adsorption and desorption on graphite in bulk adsorptive separation processes. 相似文献