Assistant Professor (Research)
Ph.D., Institute of Plasma Physics, Chinese Academy of Science , Hefei, China

Research Interests:

• Behavior and properties of electrons in novel magnetic and superconducting materials.
• Application of electric and/or magnetic fields to change the viscosity of liquid suspensions. 
• To explore electric-field penetration depth into superconductors.
• Research on radioactive materials and their surrounding atmosphere.

Selected Publications:

• Xiaojun Xu, Jun Fang, Xiaowen Cao, Kebin Li, Weiguo Yao and Zhenzhong Qi, “Angular dependence of the critical current density for epitaxial YBa2Cu3O7-δ thin film,” Solid State Commun. 92, 501-504(1994).
• X. J. Xu, J. Fang, X. W. Cao, K. Li, "The critical current density and the pinning mechanism of epitaxial YBa2Cu3O7-δ thin film," Solid State Commun. 93, 291 (1995).
• X. J. Xu, J. Fang, X. W. Cao, K. Li, "A scaling formula of critical current density for anisotropic superconductors," J. Phys. D: Appl. Phys. 29, 2473 (1996).
• X. W. Cao, J. Fang, Z. H. Wang, X. J. Xu, R. L. Wang and H. C. Li, "Two-dimensional properties of GdBa2Cu3O7-δ epitaxial thin films," Phys. Rev. B56, 8341-8345(1997).
• Xu Xiaojun, Fang Jun, LI Kebin, Fu Lan, Cao Xiaowen and Zhang Yuheng, "The dependence of activation energy upon magnetic field and temperature in YBa2Cu3O7-δ epitaxial thin film," Phys. Rev.B59,  608-612(1999).
• Yong Sun, Xiaojun Xu, Lei Zheng and Yuheng Zhang, "Effect of Ga doping in the colossal magnetoresistance material La0.67Ca0.33MnO3," Phys. Rev.B60, 12317(1999).
• Lianbin Wang, Hisashi Sekine, Xiaojun Xu, Yuheng Zhang, "Fast preparation of superconducting K-doped C60 films," Chem. Phys. Lett.305, 85-88(1999).
• Liu Xianming, Xu Xiaojun, Zhang Yuheng, “Effect of Ti dopant on the carrier density collapse in colossal magnetoresistance material La0.7Ca0.3Mn1-yTiyO3,” Physical Review B 62(22), 15112-15119(2000).  
• Zhu Hong, Xu XiaoJun, Pi Li, Zhang YuHeng, “Two-dimensional magnetic correlation and transport behavior of layered manganite La1.4Sr1.6Mn2-xCuxO7,” Physical Review B 62(10), 6754-6760(2000). 
• Pi Li, Xu Xiaojun, Zhang Yuheng, “Anomalous transport properties of heavily doped polycrystalline La0.825Sr0.175Mn1-xCuxO3,” Physical Review B 62(9), 5667-5673(2000).
• Zheng Lei, Xu Xiaojun, Pi Li, Zhang Yuheng, “Observation of electronic phase separation in La0.825Sr0.175Mn1-xCuxO3 perovskites,” Physical Review B 62(2), 1193-1196(2000).
• Sun Young, Xu Xiaojun, Zhang Yuheng, “Effects of Cr doping in La0.67Ca0.33MnO3: Magnetization, resistivity, and thermopower,” Physical Review B 63(5), 054404-1—054404-5(2001). 
• R. Tao, X. Xu, and Y. C. Lan, "Electric-field induced formation of superconducting granular balls," International J. of Modern Phys. B, V16, N17-18, .2529-2535 (2002).
• R. Tao, X. Xu, Y.C. Lan, and Y. Shiroyanagi, "Electric field induced formation of low temperature superconducting balls," Physica C, 377/ 3, 357-361 (2002).
• Cao, Xiaowen, Wang, Zhihe, Xu, Xiaojun, “Magnetoresistance and a crossover from activated to diffusive dissipation in the mixed state for YBa2Cu3O7-δ epitaxial thin films,” Physical Review B 65(6), 064521-1—064521-4(2002).
• R. Tao, X. Xu and E. Amr, “MgB2 Superconducting Particles in a Strong Electric Field,” Physica C 398, 78-84(2003).
• R. Tao, X. Xu, and E. Amr, “High Temperature Superconducting Ball Formation in AC Fields of Low Frequency,” Physical Review B 68, 144505-1—144505-7 (2003).
• R. Tao and X. Xu, “Viscosity reduction in liquid suspensions by electric or magnetic fields,” International J. of Modern Physics B, 19 (7-9): 1283-1289, APR 2005.
• R. Tao, and X. Xu, “Reducing the Viscosity of  Crude Oil by Pulsed Electric or  Magnetic Field,  Energy Fuel, 20(5), pp2046-2051, (2006)
• R. Tao, X. Xu, and Deepika Khilnaney-Chhabria, “Electrostatic Separation of  Superconducting Particles from a Mixture,” Appl. Phys. Lett.88, 082503(2006)