the financial support of the National Social Science Foundation of China （14ZDA038）;the National Natural Science Foundation of China （71222302;71373255;71573133）;the Institute of Geographic Sciences and Natural Re...the financial support of the National Social Science Foundation of China （14ZDA038）;the National Natural Science Foundation of China （71222302;71373255;71573133）;the Institute of Geographic Sciences and Natural Resources Research, Chinese Academy of Sciences （2012RC102）展开更多
CrO_(2)-TiO_(2) composites are synthesized by using a high temperature and high pressure method using CrO_(3) and H_(2)TiO_(3) as precursors.The composites consist of large rod-like CrO_(2) crystals separated by small...CrO_(2)-TiO_(2) composites are synthesized by using a high temperature and high pressure method using CrO_(3) and H_(2)TiO_(3) as precursors.The composites consist of large rod-like CrO_(2) crystals separated by small TiO_(2) grains.The CrO_(2) in the composites is very pure and its saturation magnetization is very close to the theoretical value(i.e.,2μ_(B) per formula unit).The composites exhibit a large negative magnetoresistance(MR)at 5 K.The MR in CrO_(2)-TiO_(2) composites is mainly attributed to spin-polarized tunneling between CrO_(2) crystals.The conductivity of the composites is best described by a fluctuation-induced tunneling model below 230 K.展开更多
By numerically solving the non-Born–Oppenheimer time-dependent Schr?dinger equation in a few-cycle chirped laser field(5-fs,800-nm),the effect of the permanent dipole moment on the Coulomb explosion is studied by the...By numerically solving the non-Born–Oppenheimer time-dependent Schr?dinger equation in a few-cycle chirped laser field(5-fs,800-nm),the effect of the permanent dipole moment on the Coulomb explosion is studied by the kinetic-energy-release spectra with the"virtual detector"method.The results indicate that with the effect of the permanent dipole moment,different multiphoton processes for heteronuclear and homonuclear diatomic molecular ions may take place when the wave packets transit from the ground state(1sσg)to the first excited state(2pσu),and then move along the excited potential curve,and finally charge-resonant enhanced ionization occurs at critical internuclear distance.As a result,despite the similar ionization probabilities for these two systems at higher vibrational level with larger chirp parameterβ,the structure of the Coulomb explosion spectrum for the former is prominently different from that for the latter.展开更多
The submicron chromium dioxide（CrO2） thin film was fabricated on a poly-crystal titania（TiO2） film using Si wafers as substrates by atmospheric pressure chemical vapor deposition（CVD） method. X-Ray diffraction p...The submicron chromium dioxide（CrO2） thin film was fabricated on a poly-crystal titania（TiO2） film using Si wafers as substrates by atmospheric pressure chemical vapor deposition（CVD） method. X-Ray diffraction patterns show that the CrO2 films were pure rutile structure. Scanning electron microscopy（SEM） images indicate that the CrO2 films consisted of submicron grains with a grain size of 250--750 rim. The magnetic researches reveal that the magnetic easy axis is parallel to the films, and at room temperature, the CrO2 films show linear magnetoresistance.展开更多
基金the financial support of the National Social Science Foundation of China (14ZDA038)the National Natural Science Foundation of China (71222302+2 种基金7137325571573133)the Institute of Geographic Sciences and Natural Resources Research, Chinese Academy of Sciences (2012RC102)
文摘the financial support of the National Social Science Foundation of China （14ZDA038）;the National Natural Science Foundation of China （71222302;71373255;71573133）;the Institute of Geographic Sciences and Natural Resources Research, Chinese Academy of Sciences （2012RC102）
基金Supported by the National Natural Science Foundation of China under Grant No 50972048the Program for New Century Excellent Talents in University.
文摘CrO_(2)-TiO_(2) composites are synthesized by using a high temperature and high pressure method using CrO_(3) and H_(2)TiO_(3) as precursors.The composites consist of large rod-like CrO_(2) crystals separated by small TiO_(2) grains.The CrO_(2) in the composites is very pure and its saturation magnetization is very close to the theoretical value(i.e.,2μ_(B) per formula unit).The composites exhibit a large negative magnetoresistance(MR)at 5 K.The MR in CrO_(2)-TiO_(2) composites is mainly attributed to spin-polarized tunneling between CrO_(2) crystals.The conductivity of the composites is best described by a fluctuation-induced tunneling model below 230 K.
基金Supported by the National Natural Science Foundation of China under Grant No 11047191the Key Project of the Ministry of Education of China under Grant No 211025+1 种基金the Research Fund for the Doctoral Program of Higher Education of China under Grant No 20111404120004the Natural Science Foundation for Young Scientists of Shanxi Province under Grant No 2009021005.
文摘By numerically solving the non-Born–Oppenheimer time-dependent Schr?dinger equation in a few-cycle chirped laser field(5-fs,800-nm),the effect of the permanent dipole moment on the Coulomb explosion is studied by the kinetic-energy-release spectra with the"virtual detector"method.The results indicate that with the effect of the permanent dipole moment,different multiphoton processes for heteronuclear and homonuclear diatomic molecular ions may take place when the wave packets transit from the ground state(1sσg)to the first excited state(2pσu),and then move along the excited potential curve,and finally charge-resonant enhanced ionization occurs at critical internuclear distance.As a result,despite the similar ionization probabilities for these two systems at higher vibrational level with larger chirp parameterβ,the structure of the Coulomb explosion spectrum for the former is prominently different from that for the latter.
基金Supported by the the National Natural Science Foundation of China（Nos.50972048, 61201007）, the Fundamental Research Fund for the Central Universities of China（No.ZYGX2011 J022）, the Youth Fund of Education Department of Jiangxi Province of China（No.GJJ12575） and the Open Project of State Key Laboratory of Superhard Materials（Jilin University） of China （No.201213）.
文摘The submicron chromium dioxide（CrO2） thin film was fabricated on a poly-crystal titania（TiO2） film using Si wafers as substrates by atmospheric pressure chemical vapor deposition（CVD） method. X-Ray diffraction patterns show that the CrO2 films were pure rutile structure. Scanning electron microscopy（SEM） images indicate that the CrO2 films consisted of submicron grains with a grain size of 250--750 rim. The magnetic researches reveal that the magnetic easy axis is parallel to the films, and at room temperature, the CrO2 films show linear magnetoresistance.
