The n-type conductive BaNb_(0.3) Ti_(0.7)O_(3) thin films were grown on SrTiO_(3) (001) substrates by computer-controlled laser molecular beam epitaxy. The BaNb0.3Ti0.7O3 films with (001) orientation are epitaxially g...The n-type conductive BaNb_(0.3) Ti_(0.7)O_(3) thin films were grown on SrTiO_(3) (001) substrates by computer-controlled laser molecular beam epitaxy. The BaNb0.3Ti0.7O3 films with (001) orientation are epitaxially grown on SrTiO_(3) substrates, as confirmed by x-ray diffraction techniques. The root-mean-square surface roughness of the deposited thin films is measured to be 0.24 nm by atomic force microscopy. The resistivity, carrier concentration and mobility of the BaNb_(0.3)Ti_(0.7)O_(3) thin film are 5.9 × 10^(-4) Ω. cm, 1.8 × 10^(21)cm^(-3) and 10. 7cm^(2).V^(-1).s^(-1) at room temperature,respectively, which are the best values in Nb-doped BaTiO3 thin films reported so far to our knowledge.展开更多
The in-plane magnetotransport of detwinned EuFe2As2 single crystal has been investigated.In the antiferromagnetic phase of Eu^2+spins,very different magnetoresistance results are observed upon the change of the extern...The in-plane magnetotransport of detwinned EuFe2As2 single crystal has been investigated.In the antiferromagnetic phase of Eu^2+spins,very different magnetoresistance results are observed upon the change of the external magnetic field direction and the current direction.This could be attributed to the tunable orientation of the Eu^2+spins under magnetic field.Electron scattering by spin fluctuation,superzone boundary effect,and cyclotron motion of charge carriers are used to interpret the observed anomalous magnetoresistance which is measured by using a current along a direction.The remarkable features of magnetoresistance suggest that itinerant electrons strongly couple with the spin configuration of Eu^2+,which has a huge influence on the transport properties of EuFe2As2.展开更多
A new method to measure the divergence of x-ray beams propagated out from several capillaries is introduced, This new method is based on Bragg＇s law and is proven efficiently by the experimental measurement with coll...A new method to measure the divergence of x-ray beams propagated out from several capillaries is introduced, This new method is based on Bragg＇s law and is proven efficiently by the experimental measurement with collimators and straight polycapillaries.展开更多
Rh-doped barium titanate (BaTiO3) epitaxial thin films have been fabricated on SrTiO_(3) (100) substrates by pulsed laser deposition. The nonlinear optical properties of the films were determined using the z-scan meth...Rh-doped barium titanate (BaTiO3) epitaxial thin films have been fabricated on SrTiO_(3) (100) substrates by pulsed laser deposition. The nonlinear optical properties of the films were determined using the z-scan method at a wavelength of 532nm with a laser duration of 10hs. The real and imaginary parts of the third-order nonlinear susceptibility χ^((3)) were 5.71 × 10^(-7) esu and 9.59×10^(-8) esu, respectively. The real part value of x(3) of the Rh:BaTiO3 films is about one order larger than that of Ce-doped BaTiO3 thin films. The results show that Rh:BaTiO3 thin films have great potential applications for nonlinear optical devices.展开更多
文摘The n-type conductive BaNb_(0.3) Ti_(0.7)O_(3) thin films were grown on SrTiO_(3) (001) substrates by computer-controlled laser molecular beam epitaxy. The BaNb0.3Ti0.7O3 films with (001) orientation are epitaxially grown on SrTiO_(3) substrates, as confirmed by x-ray diffraction techniques. The root-mean-square surface roughness of the deposited thin films is measured to be 0.24 nm by atomic force microscopy. The resistivity, carrier concentration and mobility of the BaNb_(0.3)Ti_(0.7)O_(3) thin film are 5.9 × 10^(-4) Ω. cm, 1.8 × 10^(21)cm^(-3) and 10. 7cm^(2).V^(-1).s^(-1) at room temperature,respectively, which are the best values in Nb-doped BaTiO3 thin films reported so far to our knowledge.
基金Project supported by the Fundamental Research Funds for the Central Universities,China(Grant No.2014JJCB27).
文摘The in-plane magnetotransport of detwinned EuFe2As2 single crystal has been investigated.In the antiferromagnetic phase of Eu^2+spins,very different magnetoresistance results are observed upon the change of the external magnetic field direction and the current direction.This could be attributed to the tunable orientation of the Eu^2+spins under magnetic field.Electron scattering by spin fluctuation,superzone boundary effect,and cyclotron motion of charge carriers are used to interpret the observed anomalous magnetoresistance which is measured by using a current along a direction.The remarkable features of magnetoresistance suggest that itinerant electrons strongly couple with the spin configuration of Eu^2+,which has a huge influence on the transport properties of EuFe2As2.
文摘A new method to measure the divergence of x-ray beams propagated out from several capillaries is introduced, This new method is based on Bragg＇s law and is proven efficiently by the experimental measurement with collimators and straight polycapillaries.
基金Supported by the National Natural Science Foundation of China under Grant No.5001161952。
文摘Rh-doped barium titanate (BaTiO3) epitaxial thin films have been fabricated on SrTiO_(3) (100) substrates by pulsed laser deposition. The nonlinear optical properties of the films were determined using the z-scan method at a wavelength of 532nm with a laser duration of 10hs. The real and imaginary parts of the third-order nonlinear susceptibility χ^((3)) were 5.71 × 10^(-7) esu and 9.59×10^(-8) esu, respectively. The real part value of x(3) of the Rh:BaTiO3 films is about one order larger than that of Ce-doped BaTiO3 thin films. The results show that Rh:BaTiO3 thin films have great potential applications for nonlinear optical devices.
