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招CSC(2021)凝聚態(tài)物理博士-巴黎六大
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巴黎索邦大學(xué)招2021年csc博士。截至日期：2021/02/10，有意向的趕緊聯(lián)系。 in hybrid metal-organic frameworks with the amx3 perovskite-like structure the physical and chemical properties can be adjusted by varying components a and m. besides potential applications in gas storage, catalysis, nonlinear optics, photoluminescence and solar cells, some of them are multiferroïcs with intriguing magnetoelectric properties. here we will be particularly interested in the [(ch)3nh2]m(hcoo)3 family of systems. in their structure, the metal cation m = fe2+, mn2+, co2+, zn2+, ni2+ linked by formate groups (x = hcoo-) form the mx2 skeleton and dimethyl-ammonium (dma) cations (a = [(ch3)nh2]+) occupy the cavities. the members of the family show an intrinsic magnetoelectric effect at low temperature [4,5,6]. the object of the proposed work is to reach a better understanding of the conditions which are necessary to obtain a simultaneous appearance of the magnetic and the charge ordering. for this, we will study the detailed structure and the elemental excitations. three experimental techniques will mainly be used: x-ray and neutron diffraction and resonant inelastic x-ray scattering (rixs). the interpretation of the experimental data will be supported by theoretical ab-initio state-of-the-art electronic structure calculations.、 resonant inelastic x-ray scattering (rixs) measures element resolved excitations, like ddexcitations, charge transfer, collective magnetic and phonon excitations [7]. our goal is to probe modifications of these excitations related to the environment of the core-excited site [8]. x-ray absorption and rixs measurement will be performed at sextants beamline at the synchrotron soleil, st. aubin, france. its rixs spectrometer, aerha, is unique as it covers the widest energy range (50‐1000 ev), while having one of the best resolving powers in the world. the interpretation of the experimental data will be supported by simultations of the x-ray absorption and rixs spectra. detailed study of the structure will be done by x-ray and neutron diffraction, as recent results show that the conventional structure of complex compounds with organic component is not always correct [9,10]. x-ray diffraction experiments will be performed first using a 4 circle diffractometer in laboratoire de physique des solides. further, in order to record very weak atomic displacements associated with the electric polarization, measurements will performed on the high flux beam-line cristal at the synchrotron soleil. the magnetic structure investigation will be performed by neutron diffraction experiments in ill (grenoble, france) or isis (united kingdom) profile of the applicant student with knowledge in chemical physics, material sciences or solid state physics. good basis in crystallography and mater-light interaction is welcome. contacts: thesis supervisor vita ilakovac email address of the thesis supervisor: vita.ilakovac-casses@sorbonne-universite.fr 課題細(xì)節(jié)見https://www.sorbonne-universite. ... 20V.%20ILAKOVAC.pdf 連接打不開的話留個(gè)郵箱，我發(fā)給你 項(xiàng)目詳情，申請(qǐng)過程見學(xué)校網(wǎng)站：https://www.sorbonne-universite. ... ernational-doctoral |
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- 蟲號(hào): 4253801
- 注冊(cè): 2015-11-29
- 專業(yè): 無機(jī)非金屬基復(fù)合材料
2樓2021-01-19 21:57:09
3樓2021-01-20 17:24:44
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