Qiao Qiao

Qiao Qiao

Research Assistant Professor

Temple University &

Brookhaven National Laboratory

Condensed Matter Physics and Material Science

Upton, NY 11973

E-mail: qiao@bnl.gov

Phone: (631)344-8177

Xiaobing Hu

Xiaobing Hu
Postdoctoral Researcher
Brookhaven National Laboratory
Condensed Matter Physics and Material Science
Building 480
Upton, NY 11973
E-mail: xbhu@bnl.gov

Jun Li

Jun Li
Research Associate

Brookhaven National Laboratory

Condensed Matter Physics and Material Science

Building 480

Upton, NY 11973

E-mail: junli@bnl.gov

Phone: (631)578-2924

Structure & Superconductivity

Like Clark Kent, who often forgoes his social life to become Superman, materials that become superconducting must sacrifice at least one of their natural properties to attain the ability to transfer electric current with zero resistance. At the NSLS and Brookhaven’s Center for Functional Nanomaterials (CFN), a team of researchers has explored this internal conflict in a class of iron-based superconductors, materials that could be used to develop energy-saving applications such as high-efficient power lines.


http://www.nsls.bnl.gov/newsroom/science/2010/pdfs/04-413.pdf

2009

1.     Bian, W.M., Zhu, Y., and Zhou, L., “Determination of space group of incommensurate modulation structure phase in Bi high temperature superconductors”, Acta Metallurgica Sinica, 45, 673-679 (2009).

2.     Han, W-Q., Su, D.,  Wu, L., Aoki, T., and Zhu, Y., “Tri- and quadri-metallic ultrathin nanowires synthesized by one-step phase-transfer approach”, Nanotechnology 20, 495605 (2009).

3.     He, J., Gueguen, A., Sootsman, J.R., Zheng, J.-C., Wu, L., Zhu, Y., Kanatzidis, M.G., and Dravid, V.P., “Role of Self-Organization, Nanostructuring, and Lattice Strain on Phonon Transport in NaPb18-xSnxBiTe20 Thermoelectric Materials”, J. AM. CHEM. SOC., 131, 17828–17835, (2009).

4.     He, J., Volkov, V.V., Beleggia, M., Asaka,  T., Tao, J., and  Zhu, Y., ”Measurement of ferromagnetic domain structures and spin configurations in doped manganite”, Phys. Rev. B in press (2009).

5.     Huang, L., Schofield, M.A.,  and Zhu, Y., “Direct observation of the controlled magnetization reversal processes in Py/Al/Py asymmetric ring stacks”, Appl. Phys., Lett., 95, 042501, (2009).

6.     Huang, L., and Zhu, Y., “Controlled reversal of coupled Néel walls in flux-closure magnetic trilayer elements”, Appl. Phys., Lett., 95, 222502 (2009).

7.     Inada, H.; Wu, L.; Wall, J.; Su, D.; Zhu, Y., “Performance and Image Analysis of the Aberration Corrected Hitachi HD-2700C STEM”, J. Electron Microscopy, 58  111 – 122  (2009).

8.     Ke, X., Chen, C., Yang, J., Wu, L., Zhou, J., Li, Q., Zhu, Y., and Kent., P.R.C., “ Microstructure and a Nucleation Mechanism for Nanoprecipitates in PbTe-AgSbTe₂”, Phys. Rev. Lett., 103, 145502 (2009).

9.     Lim, B.; Jiang, M.; Camargo, P.H.C.; Cho, E.C.; Tao, J.; Lu, X.; Zhu, Y.; Xia, Y., “Pd-Pt Bimetallic Nanodendrites with High Activity for Oxygen Reduction,” Science, 324, 1302 – 1305, (2009).

10.  Lim, B., Jiang, M., Tao, J.,  Camargo, P.H.C., Zhu, Y., and Xia, Y., “Shape-controlled synthesis of Pd nanocrystals in aqueous solutions”, Advanced Functional Materials (feature article) 19, 189–200 , (2009).

11.  Luo, W.; Varela, M.; Tao, J.; Pennycook, S.J.; Pantelides, S.T., “Electronic and Crystal-field Effects in the Fine Structure of Electron Energy-Loss Spectra of Manganites”, Phys. Rev. B, 79, 052405, (2009).

12.  Meng, Q.P.; Welch, D.O.; Zhu, Y., “Strain-Induced Changes of Oxygen Ordering in YBa2Cu3O6+δ Cuprates”, Phys. Rev. B, 79, 134531 (2009).

13.  McQueen, T. M.,  Williams, A. J., Stephens, P.W.,  Tao, J.,  Zhu, Y.,  Ksenofontov, V.,  Casper, F.,  Felser, C., and Cava, R. J.,   "Tetragonal-to-Orthorhombic Structural Phase Transition at 90Kin the Superconductor Fe1:01Se", Phys. Rev. Lett. 103, 057002 (2009).

14.  Tao, J., Niebieskikwiat, D., Varela, V.,  Luo, W., Schofield, M.A.,  Zhu, Y., Salamon, M.B.,  Zuo, J.M., Pantelides, S.T., and Pennycook, S.J., "Direct imaging of nanoscale phase separation in La_0.55Ca_0.45MnO₃: relationship to colossal magnetoresistance", Phys. Rev. Lett., 103 097202 (2009), highlighted in Physics Today, Nov. issue, p20-23).

15.  Upton, M.H., Klie, R.F., Hill, J.P., Gog, T., Casa, D., Kuc, W., Zhu, Y., Sfeir, M.Y. , Misewich, J., Erese, G., and Lowndes, D.,  “Effect of number of walls on plasmon behavior in carbon nanotubes”, CARBON, 47 162-168 (2009).

16.  Vaz , C.A.F. , Wanga, H.-Q., Ahn, C.H., Henrich, V.E., Baykara, M.Z., Schwendemann, T.C., Pilet N., Albers, B.J., Schwarz, U.D., Zhang, L.H., Zhu, Y., Wangd, J., Altman, E.I., “ Interface and electronic characterization of thin epitaxial Co3O4 films”, Surface Science 603 291–297 (2009).

17.  Wang, J., Inada, H., Wu, L., Zhu, Y., Choi, Y., Liu, P., Zhou, W., and Adzic, R.R., “Oxygen Reduction on Well-Defined Core-Shell Nanocatalysts: Particle Size, Facet, and Pt Shell Thickness Effects”, J. AM. CHEM. SOC, 131 17298-17302 (2009).

18.  Wu, L., Zheng, J.C., Zhou, J., Li, Q., Yang, J.H., and Zhu, Y., “Nanostructures and defects in thermoelectric AgPb18SbTe20 single crystal”, J. Appl. Phys. 105, 094317 (2009).

19.  Xu, F., Volkov, V.V., Zhu, Y., Bai, H., Rea, A., Valappil, N.V., Gao, X., Kuskovsky, I.L., and Matsui, H., “Long Electron-Hole Separation of ZnO-CdS Core-Shell Quantum Dots”, J. Phys. Chem. C, 113 19419-19423, (2009).

20.  Xue, K., Chen, S., Wang,L., Wei, R., Xu,S., Cui, L., Mao, B.,  Tian, Z., Zen, C., Sun, S., Wu, L., and Zhu,Y., “Fabrication and characterization of oriented carbon atom wires assembled on gold”, Chemical Physics Lett., 469, 284-288 (2009).  

21.  Zheng, J.-C. Wu, L., and Zhu, Y., “Aspherical electron scattering factors and their parameterizations for elements from H to Xe”, J. of Appl. Crystallography, 42 1043-1053 (2009).

22.  Zhong, H.; Huang, L.; Wei, D.; Wang, S.; Zhu, Y. and Yuan, J., “Experimental Determination of Ultra-Sharp Stray Field Distribution from a Magnetic Vortex Core Structure, “ J. Mag. Mag. Mat., 321  L37 - L40, (2009).

23.  Zhu, Y., Inada, H., Wu, L., Wall, J., and Su, D., “The aberration-corrected Hitachi HD-2700C STEM at Brookhaven National Laboratory”, Hitachi E.M. News 3 2-13 (2009).

24.  Zhu, Y., and Jarausch, K., “Advanced Electron Microscopy in Materials Physics,” J. Electron Microscopy, 58, 73 – 75  (2009).

25.  Zhu, Y., Inada, H., Nakamura, K., and Wall, J., “Imaging single atoms using secondary electrons with an aberration-corrected electron microscope”, Nature Materials, 8 808-812 (2009).

Nanoscale phase competition accompanies colossal magnetoresistance

The CMR effect itself arises when the paramagnetic insulating phase yields to the ferromagnetic metallic phase. Now, Jing Tao of Brookhaven National Laboratory and her collaborators have found evidence that a charge-ordered, possibly antiferromagnetic phase plays a role too. Tao derived her results using a new technique, scanning electron nanodiffraction (SEND). The technique combines electron diffraction's ability to reveal the presence of ordered structures with scanning microscopy's ability to reveal those structures' real-space distribution.

http://scitation.aip.org/getabs/servlet/GetabsServlet?prog=normal&id=PHTOAD000062000011000020000001&idtype=cvips&gifs=yes

Simultaneous Nanoscale Imaging of Surface and Bulk Atoms

UPTON, NY — Scientists at the U.S. Department of Energy’s (DOE) Brookhaven National Laboratory, in collaboration with researchers from Hitachi High Technologies Corp., have demonstrated a new scanning electron microscope capable of selectively imaging single atoms on the top surface of a specimen while a second, simultaneous imaging signal shows atoms throughout the sample’s depth. This new tool, located at Brookhaven Lab’s Center for Functional Nanomaterials (CFN), will greatly expand scientists’ ability to understand and ultimately control chemical reactions, such as those of catalysts in energy-conversion devices...


http://www.bnl.gov/cfn/news/PRdisplay.asp?prID=1008