Dr. Xiaoshan Xu e-mail: Dr. Chandra Biomechanics and Materials Laboratory Dr. Chandra's Web Page email: Dr. Chandra Assoc. Dean of Research - College of Engineering NCMN Homepage

Dr. Xiaoshan Xu, Assistant Professor
Physics & Astronomy
University of Nebraska - Lincoln
310M Jorgenson Hall
Lincoln, Nebraska 68588
Office: (402) 472-6134
email: xiaoshan.xu@unl.edu

Current Research

"We are interested in complex oxide thin films and their interfaces to the organic semiconductors. The focus on our activities is on the preparation (growth) of new high quality thin film materials and interfaces, and the characterization of their multiferroic and magnetoelectric properties."

Recent Publications

1.   Lee, J.; Trugman S. A.; Batista C. D.; Zhang C. L.; Talbayev D.; Xu, X. S.; Cheong S.-W.; Yarotski D. A.; Taylor A. J.; Prasankumar R. P.; Probing the Interplay between Quantum Charge Fluctuations and Magnetic Ordering in LuFe2O4. Scientific Report, 3, 2654.

2.   Li, S. F.; Zhao, X. J.; Xu, X. S.; Gao, Y. F.; Zhang, Z.Y. Stacking principle and magic sizes of transition metal nanoclusters based on generalized wulff construction. Physical Review Letters 111, 115501 (2013).

3.   Guo, H.; Noh, J. H.; Dong, S.; Rack, P. D.; Gai, Z.; Xu, X.S.; Dagotto, E.; Shen, J.; Ward, T Z. Electrophoretic-like Gating Used to Control Metal-Insulator Transitions in Electronically Phase Separated Manganite Wires. Nano letters 13, 3749 (2013).

4.   Guo, H.W.; Sun, D.L.; Wang, W.B.; Gai, Z.; Kravchenko, I.; Shao, J.; Jiang, L.; Ward, T.Z.; Snijders, P.C.; Yin, L.F.; Shen, J.; Xu, X.S.*. Growth diagram of La0.7Sr0.3MnO3 thin films using pulsed laser deposition. Journal of Applied Physics 113, 234301 (2013).

5.   Miller, K.H.; Xu, X.S.; Berger, H.; Craciun, V.; Xi, X.X.; Martin, C.; Carr, G.L.; Tanner, D.B. Infrared phonon modes in multiferroic single-crystal FeTe2O5Br. Physical Review B 87, 224108 (2013).

6.   Wang, W.B., Zhao, J.; Gai, Z; Balke, N.; Chi, M.; Lee, H.N.; Tian, W.; Zhu, L.Y.; Cheng, X.M.; Keavney, D.J.; Yi, J.Y.; Ward, T.Z.; Snijders, P.C.; Christen, H.M.; Shen, J.; Xu, X.S.*; Room-temperature coexistence of magnetic order and ferroelectricity in single crystal hexagonal LuFeO3 films. Physical Review Letters 110, 237601 (2013).

7.   Wang, W.B.; Wang, H.W.; Xu, X.Y.; Zhu, L.Y.; He, L.X.; Wills, E.; Cheng, X.M.; Keavney, D.J.; Shen, J.; Wu, X.F.*; Xu, X.S.*; Crystal field splitting and optical band gap of hexagonal LuFeO3 films. Applied Physics Letters 101, 241907 (2012).

8.   Wang, W.B.; Gai, Z.; Chi, M.F.; Fowlkes, J.; Yi, J.Y.; Zhu, L.Y.; Cheng, X.M.; Keavney D.J.; Snijders, P.C.; Ward, T.Z.; Shen, J.*; Xu, X.S.*; Growth diagram and magnetic properties of hexagonal LuFe2O4 thin films. Physical Review B 85, 155411 (2012).

9.   Xu, X.S.; Yin, S.Y.; Moro, R.; Liang, A.; Bowlan, J.; de Heer, W.A.; Metastability of free cobalt and iron clusters: A possible precursor to bulk ferromagnetism. Physical Review Letters 107, 057203 (2011).

10.   Sun, Q.C.; Xu, X.S.; Baker, S.N.; Christianson, A.D.; and Musfeldt, J.L.; Experimental Determination of Ionicity in MnO Nanoparticles.                 Chemistry of Materials 23, 2956 (2011).

11.   Xu, X.Y.; Seal, K.; Xu, X.S.; Ivanov, I.; Hsueh, C.H.; Abu, H.; Yin, L.F.; Zhang, X.Q.; Cheng, Z.H.; Gu, B.H.; Zhang, Z.Y.; Shen, J.; High Tunability of the Surface-Enhanced Raman Scattering Response with a Metal-Multiferroic composite. Nano Letters 10, 1265 (2011).

12.   Chen, P.; Xu, X.S.; Koenigsmann, C.; Santulli, A.C.; Wong, S.S.; Musfeldt, J.L.; Size-Dependent Infrared Phonon Modes and Ferroelectric Phase Transition in BiFeO3. Nano Letters 10, 4526, (2010).

13.   Miller, K.H.; Xu, X.S.; Berger, H.; Knowles, E.; Arenas, D.; Meisel, M.; Tanner, D.; Magnetodielectric coupling of infrared phonons in single-crystal Cu2OSeO3. Physical Review B 82, 144107 (2010)

14.   Lee, J.H.; Ke, X.; Misra, R.; Ihlefeld, J.F.; Xu, X.S.; Mei, Z.G.; Heeg, T.; Roeckerath, M.; Schubert, J.; Liu, Z.K.; Musfeldt, J.L.; Schiffer, P.; Schlom, D.G.; Adsorption-controlled growth of BiMnO3 films by molecular-beam epitaxy. Applied Physics Letters 96, 262905 (2010).

15.   Xu, X.S.; de Groot, J.; Sun, Q.C.; Sales, B.C.; Mandrus, D.; Angst, M.; Litvinchuk, A.P.; Musfeldt J.L.; Lattice dynamical probe of charge order and antipolar bilayer stacking in LuFe2O4. Physical Review B 82, 014304 (2010).

16.   Xu, X.S.; Ihlefeld, J.F.; Lee, J.H.; Ezekoye, O. K.; Vlahos, E.; Ramesh, R.; Gopalan, V.; Pan, X.Q.; Schlom, D.G.; Musfeldt, J.L.; Tunable band gap in Bi(Fe1-xMnx)O3 films. Applied Physics Letters 96, 192901 (2010).

17.   Chen, P; Podraza, N.J.; Xu, X.S.; Melville, A.; Vlahos, E.; Gopalan, V.; Ramesh, R.; Schlom, D.G.; Musfeldt, J.L.; Optical properties of quasi-tetragonal BiFeO3 thin films. Applied Physics Letters 96, 131907 (2010)

18.   Xu, X.S.; Brinzari, T.V.; McGill, S.; Zhou, H.D.; Wiebe, C.R.; Musfeldt, J.L.; Absence of Spin Liquid Behavior in Nd3Ga5SiO14 Using Magneto-Optical Spectroscopy. Physical Review Letters 103, 267402 (2009).

19.   Xu, X.S.; Sun, Q.C.; Rosentsveig, R.; Musfeldt, J.L.; Evaluation of Born and local effective charges in unoriented materials from vibrational spectra. Physical Review B 80, 014303 (2009).

20.   Ramirez, M.O.; Kumar, A.; Denev, S.A.; Podraza, N.; Xu, X.S.; Rai, R.C.; Chu, Y.H.; Seidel, J.; Martin, L.W.; Yang, S.Y.; Saiz, E.; Ihlefeld, J.F.; Lee, S.; Klug, J.; Cheong, S.W.; Bedzyk, M.J.; Auciello, O.; Schlom, D.G.; Ramesh, R.; Orenstein, J.; Musfeldt, J.L.; Gopalan, V.; Magnon sidebands and spin charge coupling in bismuth ferrite probed by nonlinear optical spectroscopy. Physical Review B 79, 224106 (2009).

21.   Sun, Q.C.; Xu, X.S.; Vergara, L.I.; Tenne, R.; Zak, A.; Musfeldt, J.L.; Dynamical charge and structural strain in inorganic fullerene-like MoS2 nanoparticles. Physical Review B 79, 205405 (2009).

22.   Ramirez, M.O.; Kumar, A.; Denev, S.A.; Chu, Y.H.; Seidel, J.; Martin, L.W.; Yang,  S.Y.; Rai, R.C.; Xu, X. S.; Ihlefeld,  J.F.; Podraza,  N.; Saiz, E.;Lee, S.; Klug, J.; Cheong, S.W.; Bedzyk, M.J.; Auciello, O.; Schlom, D.G.; Orenstein, J.; Ramesh, R.; Musfeldt,  J.L.; Litvinchuk, A.P.; Gopalan, V.; Spin-Charge-Lattice Coupling through Resonant Multi-Magnon Excitations in Multiferroic BiFeO3. Applied Physics Letters 94, 161905 (2009).

23.   Xu, X.S.; Brinzari, T.V.; Rai, R.C.; Musfeldt, J.L.; McGill, S.; Chu, Y.H.; Ramesh, R.; Kumar, A.; Gopalan, V.; Lee, S.; and Cheong S.W.; Optical Properties and Magnetochromism in Multiferroic BiFeO3. Physical Review B 79, 134425 (2009).

24.   Xu, X.S.; Angst, M.; Brinzari, T.V.; Hermann, R.P.; Musfeldt, J.L.; Christianson, A.D.; Mandrus, D.; Sales, B.C.; McGill, S.; Kim, J.W.; Islam Z.; Charge order, dynamics, and magneto-structural transition in multiferroic LuFe2O4. Physical Review Letters 101, 227602 (2008).

25.   Xu, X.S.; Yin, S.Y.; Moro, R.; de Heer, W.A.; Distribution of magnetization of a cold ferromagnetic cluster beam. Physical Review B 78, 054430 (2008).

26.   Yin, S.Y.; Xu, X.S.*; Liang, A.; Bowlan, J.; Moro, R.; de Heer, W.A.; Electron pairing in ferroelectric niobium and niobium alloy clusters. Journal of Superconductivity and Novel Magnetism 21, 265-269 (2008).

27.   Ihlefeld, J.F.; Podraza, N.J.; Liu, Z.K.; Rai, R.C.; Xu, X.S.; Heeg, T.; Chen, Y.B.; Li, J.; Collins, R. W.; Musfeldt, J.L.; Pan, X.Q.; Schubert, J.; Ramesh, R.; Schlom, D.G.; Optical band gap of BiFeO3 grown by molecular-beam epitaxy. Applied Physics Letters 92, 142908 (2008).

28.   Basu, S.R.; Martin, L.W.; Chu, Y.H.; Gajek, M.; Ramesh, R.; Rai, R.C.; Xu, X.S.; Musfeldt, J.L.; Photoconductivity in BiFeO3 thin films. Applied Physics Letters 92, 091905 (2008).

29.   Yin, S.Y.; Moro, R.; Xu, X.S.; de Heer, W.A.; Magnetic enhancement in cobalt-manganese alloy clusters. Physical Review Letters 98, 113401 (2007).

30.   Xu, X.S.; Yin, S.Y.; Moro, R.; Liang, A.; Bowlan, J.; de Heer, W.A.; Nonclassical dipoles in cold niobium clusters. Physical Review B 75, 085429 (2007).

31.   Xu, X.S.; Yin, S.Y.; Moro, R.; de Heer, W.A.; Magnetic moments and adiabatic magnetization of free cobalt clusters. Physical Review Letters 95, 23729 (2005).

32.   Yin, S.G.; Xu, X.S.; Moro, R.; de Heer, W.A.; Measurement of magnetic moments of free BiNMnM clusters. Physical Review B 72, 174410 (2005).

33.   Moro, R.; Yin, S.Y.; Xu, X.S.; de Heer, W.A.; Spin uncoupling in free Nb clusters: Support for nascent superconductivity. Physical Review Letters 93, 086803 (2004).

34.   Moro, R.; Xu, X.S.; Yin, S.Y.; de Heer, W.A.; Ferroelectricity in free niobium clusters. Science 300, 1265-1269 (2003).

35.   Li, A.; Ying, X.N.; Qi, Y.B.; Xu, X.S.; Bao, Z.H.; Zhang, Q.M.; Zhu, Y.P.; Wang, Y.N.; Effect of zinc doping on the microstructure in YBCO. Physica C 341, 669-670 (2000).

36.   Li, A.; Ying, X.N.; Xu, X.S.; Zhang, Q.M.; Li, B.Q.; Chen, W.M.; Wang, Y.N.; Anelastic relaxation near TC in Zn-substituted YBCO. Physica C 337, 285-287 (2000).

37.   Lu, X.M.; Zhu, J.S.; Liu, Z.G.; Xu, X.S.; Wang, Y.N.; Phase transition related stress in ferroelectric thin films. Thin Solid Films 375, 15-18 (2000).

38.   Zhang, Q.M.; Wang, Y.N.; Li, A.; Qiu, Q.; Xu, X.S.; Feng, Y.; Zhou, L.; Phase coherence effect on the normal state internal friction in underdoped YBa2Cu3O7−δ. Physica C 337, 208-212 (2000).

39.   Zhang, Q.M.; Xu, X.S.; Wang, Y.N.; Structural stripe phase effect on band structure in underdoped YBa2Cu3O7− δ. Physica C 341, 1783 (2000).

40.   Zhang, Q.M.; Xu, X.S.; Ying, X.N.; Li, A.; Qiu, Q.; Wang, Y.N.; Xu, G.J.; Zhang, Y.H.; Study on the anomalies of thermoelectric power due to the normal-state pseudogap in underdoped cuprates. Physica C 337, 277-280, (2000).

41.   Zhang, Q.M.; Ying, X.N.; Li, A.; Chen, W.M.; Xu, X.S.; Li, B.Q.; Wang, Y.N.; Investigation on three internal friction peaks at low temperature in Ni doped YBa2Cu3O7− δ. Physica C 341, 601 (2000).

42.   Zhang Q.M.; Wang Y.N.; Li A.; Qiu Q.; Xu, X.S.; Feng Y.; Zhou L.; Acoustic attenuation study on the normal-state pseudogap in underdoped YBa2Cu3O7− δ. Europhysics Letters 47, 104 (1999).

43.   Zhang, Q.M.; Wang, Y.N.; Shen, H.M.; Xu, X.S.; Tian, W.; Huang, Y.N.; Anomalies of mechanical and transport properties above TC in underdoped Gd1−xPrxCu3O6+ δ. Physica C 282, 1053 (1997).