Huibo Cao

Huibo Cao

Position: Lead Instrument Scientist

Instrument: Four-Circle Diffractometer

Group: Structure of Matter

Division: Quantum Condensed Matter Division

Facility: Spallation Neutron Source

Contact: caoh@ornl.gov

Education

2002-2007 : PhD in Condensed Matter Physics, Institute of Physics, Chinese Academy of Sciences, China

1998-2002 : B.S. in Physics, Shanxi University, China

Research

Strong couplings of lattice, electron, spin, orbital degrees of freedom produce a rich variety of physical phenomena and also technologically important materials, including superconductor, multiferroic, and thermoelectric materials. Neutrons and X-ray studies of structural and dynamic properties of these materials yield essential understanding of the relationships between those coupled degrees of freedoms and further guide new material development.

Selected Publications

W. Ratcliff II, Z. Yamani, V. Anbusathaiah, T.R. Gao, P.A. Kienzle, H. Cao, and I. Takeuchi, “Electric-field-controlled antiferromagnetic domains in epitaxial BiFeO3 thin films probed by neutron diffraction” Phys. Rev. B 87, 140405(R) (2013).

A. Kiswandhi, J.S. Brooks, H.B. Cao, J.Q. Yan, D. Mandrus, Z. Jiang, and H.D. Zhou, “Competition between the structural phase transition and superconductivity in Ir1-xPtxTe2 as revealed by pressure effects” Phys. Rev. B 87, 121107(R) (2013).

J.-Q. Yan, M. A. McGuire, A. F. May, H. Cao, A. D. Christianson, D. G. Mandrus, and B. C. Sales, “Flux growth and physical properties of Mo3Sb7 single crystals” Phys. Rev. B 87, 104515 (2013).

J. Zhao, H. Cao, E. Bourret-Courchesne, D.-H. Lee, R.J. Birgeneau “Neutron-Diffraction Measurements of an Antiferromagnetic Semiconducting Phase in the Vicinity of the High-Temperature Superconducting State of KxFe2-ySe2Phys. Rev. Lett. 109, 267003 (2012).

A.F. May, M.A. McGuire, H. Cao, I. Sergueev, C. Cantoni, B.C. Chakoumakos, D.S. Parker, B.C. Sales “Spin reorientation in TlFe1.6Se2 with complete vacancy ordering” Phys. Rev. Lett. 109, 077003 (2012).

H. Cao, C. Cantoni, A.F. May, M.A. McGuire, B.C. Chakoumakos, S.J. Pennycook, R. Custelcean, A.S. Sefat, B.C. Sales, "Evolution of the nuclear and magnetic structures of TlFe1.6Se2 with temperature" Phys. Rev. B 85, 054515 (2012).

M. Frontzek, G. Ehlers, A. Podlesnyak, H. Cao, M. Matsuda, O. Zaharko, N. Aliouane, S. Barilo, S.V. Shiryaev, "Magnetic structure of CuCrO2: a single crystal neutron diffraction study" J. Phys.: Condens. Matter 24, 16004 (2012).

F. Ye, S. Chi, J.A. Fernandez-Baca, H. Cao, K.-C. Liang, Y. Wang, B. Lorenz, C.W. Chu, “Magnetic order and spin-flop transition in the cobalt-doped multiferroic Mn1-xCoxWO4Phys. Rev. B 86, 094429 (2012).

C.H. Wang, M.D. Lumsden, R.S. Fishman, G. Ehlers, T. Hong, W. Tian, H. Cao, A. Podlesnyak, C. Dunmars, J.A. Schlueter, J.L. Manson, A.D. Christianson, “Magnetic properties of the S=1/2 quasi-square lattice antiferromagnetic CuF2(H2O)2pyz (pyz=pyrazine) investigated by neutron scattering” Phys. Rev. B 86, 064439 (2012).

M. Frontzek, G. Ehlers, A. Podlesnyak, H. Cao, M. Matsuda, O. Zaharko, N. Aliouane, S. Barilo, S.V. Shiryaev, “Magnetic structure of CuCrO2: a single crystal neutron diffraction study” J. Phys.: Condens. Matter 24, 16004 (2012).

F. Ye, S. Chi, H. Cao, B.C. Chakoumakos, J.A. Fernandez-Baca, R. Custelcean, T.F. Qi, O.B. Korneta, G. Cao, "Direct evidence of a zigzag spin-chain structure in the honeycomb lattice: A neutron and x-ray diffraction investigation of single-crystal Na2IrO3" Phys. Rev. B, 85 180403(R) (2012).

X. Ke, B. Qian, H. Cao, J. Hu, G.C. Wang, Z.Q. Mao, "Magnetic structure of quasi-one-dimensional antiferromagnetic TaFe1+yTe3" Phys. Rev. B 85, 214404 (2012).

B. Saparov, S. Calder, B. Sipos, H. Cao, S. Chi, D.J. Singh, A.D. Christianson, M.D. Lumsden, A.S. Sefat, “Spin glass and semiconducting behavior in 1-D BaFe2-δSe3 crystals” Phys. Rev. B 84, 245132 (2012).

M. Wang, M.Y. Wang, G.N. Li, Q. Huang, C.H. Li, G.T. Tan, C.L. Zhang, H. Cao, W. Tian, Yang Zhao, Y.C. Chen, X.Y. Lu, B. Sheng, H.Q. Luo, S.L. Li, M.H. Fang, J.L. Zarestky, W. Ratcliff, M.D. Lumsden, J.W. Lynn, P. Dai, “Antiferromagnetic order and superlattice structure in nonsuperconducting and superconducting RbyFe1.6+xSe2Phys. Rev. B 84, 094504 (2011).

B.C. Sales, M.A. McGuire, A.F. May, H. Cao, B.C. Chakoumakos, and A.S. Sefat, “Unusual phase transitions and magnetoelastic coupling in TlFe1.6Se2 single crystalsPhys. Rev. B 83, 224510 (2011).

B.C. Chakoumakos, H. Cao, F. Ye, A.D. Stoica, M. Popovici, M. Sundaram, W. Zhou, J.S. Hicks, G.W. Lynn, and R.A. Riedel, “Four-circle single-crystal neutron diffractometer at the High Flux Isotope Reactor” J. Appl. Crystallogr. 44, 655 (2011).

K. Marty, A.D. Christianson, C.H. Wang, M. Matsuda, H. Cao, L.H. VanBebber, J.L. Zarestky, D.J. Singh, A.S. Sefat, M.D. Lumsden “Competing magnetic ground states in nonsuperconducting Ba(Fe1−xCrx)2As2 as seen via neutron diffraction” Phys. Rev. B 83, 060509(R) (2011).

H. Cao, I. Mirebeau, and A. Gukasov P. Bonville C. Decorse, “Field evolution of the magnetic structures in Er2Ti2O7 through the critical point” Phys. Rev. B 82, 104431 (2010)

A.P. Sazonov, A. Gukasov, I. Mirebeau, H. Cao, P. Bonville, B. Grenier, and G. Dhalenne, “Field-induced magnetic structures in Tb2Ti2O7 at low temperatures: From spin-ice to spin-flip structures” Phys. Rev. B 82, 174406 (2010).

A. Gukasov, H. Cao, I. Mirebeau, P. Bonville, “Spin Density and Non-Collinear Magnetization in Frustrated Pyrochlore Tb2Ti2O7 from Polarized Neutron Scattering” Physica B: Condensed Matter, 404, 2509 (2009).

H. Cao, A. Gukasov, I. Mirebeau, P. Bonville, C. Decorse, and G. Dhalenne, “Ising versus XY anisotropy in frustrated R2Ti2O7 compounds as seen by polarized neutrons” Phys. Rev. Lett. 103, 056402 (2009).

H. Cao, A. Gukasov, I. Mirebeau, and P. Bonville, “Anisotropic exchange in frustrated pyrochlore Yb2Ti2O7J. Phys.: Condens. Matter 21, 492202 (2009).

I. Mirebeau, I. Goncharenko, H. Cao, and A. Forget, “Magnetic order in Tb2Sn2O7 under high pressure: From ordered spin ice to spin liquid and antiferromagnetic order” Phys. Rev. B 80, 220407(R) (2009).

H. Cao, A. Gukasov, I. Mirebeau, P. Bonville, and G. Dhalenne, “Field-Induced Spin-Ice-Like Orders in Spin Liquid Tb2Ti2O7Phys. Rev. Lett. 101, 196402 (2008).