We here explore black holes in the third order Lovelock gravity coupling with nonlinear Born-Infeld electro- magnetic field. Considering special second and third order coefficients （＆g = 363 = a2）, we analyze the t...We here explore black holes in the third order Lovelock gravity coupling with nonlinear Born-Infeld electro- magnetic field. Considering special second and third order coefficients （＆g = 363 = a2）, we analyze the thermodynamics of third order Lovelock-Born-Infeld black holes and, in 7-dimensional AdS space-time, discuss the stability of black holes in different event horizon structures. We find that the cosmological constant A plays an important role in the distribution of black hole stable regions.展开更多
The theoretical study on magneto- structural correlation in linear trinuclear Cu (II) com- plex bridged by hydroxo group and bidentate formato group has been performed using the broken symme- try approach with the fra...The theoretical study on magneto- structural correlation in linear trinuclear Cu (II) com- plex bridged by hydroxo group and bidentate formato group has been performed using the broken symme- try approach with the framework of density functional theory (DFT-BS). The magnetic coupling constant for the model complex is 70.97 cm?1, comparable with the experimentally measured J value (77 cm?1). The calculated results show that the magnetic coupling interaction firstly slightly increases with the changes of the coordination environment around the terminal Cu atoms from a distorted square pyramid to a trigonal bi-pyramid, and decreases subsequently. In the course of changes, the sign of J value shifts from positive to negative. The magnetic coupling interac- tion is sensitive to coordination environment of the terminal Cu. The calculated results also reveal that the ferromagnetic coupling arises from the counter- complementarity of the hydroxo and formato bridges. Molecular orbital analysis validates the conclusion.展开更多
基金Supported by National Natural Science Foundation of China under Grant No. 10875060
文摘We here explore black holes in the third order Lovelock gravity coupling with nonlinear Born-Infeld electro- magnetic field. Considering special second and third order coefficients （＆g = 363 = a2）, we analyze the thermodynamics of third order Lovelock-Born-Infeld black holes and, in 7-dimensional AdS space-time, discuss the stability of black holes in different event horizon structures. We find that the cosmological constant A plays an important role in the distribution of black hole stable regions.
基金This work was supported by the Major State Basic Research Development Programs(Grant No.2004CB719902)the National Natural Science Foundation of China(Grant No.20373033).
文摘The theoretical study on magneto- structural correlation in linear trinuclear Cu (II) com- plex bridged by hydroxo group and bidentate formato group has been performed using the broken symme- try approach with the framework of density functional theory (DFT-BS). The magnetic coupling constant for the model complex is 70.97 cm?1, comparable with the experimentally measured J value (77 cm?1). The calculated results show that the magnetic coupling interaction firstly slightly increases with the changes of the coordination environment around the terminal Cu atoms from a distorted square pyramid to a trigonal bi-pyramid, and decreases subsequently. In the course of changes, the sign of J value shifts from positive to negative. The magnetic coupling interac- tion is sensitive to coordination environment of the terminal Cu. The calculated results also reveal that the ferromagnetic coupling arises from the counter- complementarity of the hydroxo and formato bridges. Molecular orbital analysis validates the conclusion.
