Spin Order and Excitations in Triangular Antiferromagnet La2Ca2MnO7 (2009)
Bao, Wei, Wang, Y. X., Qiu, Y., Li, K., Lin, J. H., Copley, J. R. D., ...
We report a spin S = 3/2 triangular antiferromagnet with nearest-neighbor coupling J = 0.29 meV in La2Ca2MnO7. A genuinely two-dimensional, three-sublattice order develops below 2.80 K
Spin Gap and Resonance at the Nesting Wavevector in Superconducting FeSe0.4Te0.6 (2009)
Qiu, Yiming, Bao, Wei, Zhao, Yang, Broholm, Collin, Stanev, V., Tesanovic, Z., ...
Neutron scattering is used to probe magnetic excitations in FeSe_{0.4}Te_{0.6} (T_c=14 K). Low energy spin fluctuations are found with a characteristic wave vector $(0.5,0.5,L)$ that corresponds to...
Neutron scattering investigation of the magnetic order in single crystalline BaFe2As2 (2009)
Kofu, M., Qiu, Y., Bao, Wei, Chang, S., Wu, T., ...
The magnetic structure of BaFe2As2 was completely determined from polycrystalline neutron diffraction measurements soon after the ThCr2Si2-type FeAs-based superconductors were discovered. Both the...
Incommensurate magnetic order in the alpha-Fe(Te,Se) superconductor systems (2008)
Bao, Wei, Qiu, Y., Huang, Q., Green, M. A., Zajdel, P., Fitzsimmons, M. R., ...
Magnetic spin fluctuations is one candidate to produce the bosonic modes that mediate the superconductivity in the ferrous superconductors. Up until now, all of the LaOFeAs and BaFe2As2 structure...
Coexistence of the spin-density-wave and superconductivity in the (Ba,K)Fe2As2 (2008)
Chen, H., Ren, Y., Qiu, Y., Bao, Wei, Liu, R. H., Wu, G., ...
The relation between the spin-density-wave (SDW) and superconducting order is a central topic in current research on the FeAs-based high Tc superconductors. Conflicting results exist in the...
Huang, Q., Qiu, Y., Bao, Wei, Lynn, J. W., Green, M. A., Chen, Y., ...
In addition to higher Tc compared with the ubiquitous cuprates for a material composed of a single electronically active layer, the newly discovered LnFeAsO superconductors offer additional...
Structure and Magnetic Order in the NdFeAs(O,F) Superconductor System (2008)
Qiu, Y., Bao, Wei, Huang, Q., Yildirim, T., Simmons, J., Lynn, J. W., ...
The transition temperature Tc~26 K of the recently discovered superconductor LaFeAs(O,F) has been demonstrated to be extremely sensitive to the lanthanide ion, reaching 55 K for the Sm containing...
Neutron scattering study of the oxypnictide superconductor La(O,F)FeAs (2008)
Qiu, Y., Kofu, M., Bao, Wei, Huang, Q., Yildirim, T., ...
The newly discovered superconductor La(O,F)FeAs (Tc = 26 K) was investigated using the neutron scattering technique. No spin-density-wave (SDW) order was observed in the normal state nor in the...
Spin-valve effect and magnetoresistivity in single crystalline Ca3Ru2O7 (2008)
Bao, Wei, Mao, Z. Q., Qu, Z., Lynn, J. W.
The laminar perovskite Ca3Ru2O7 naturally forms ferromagnetic double-layers of alternating moment directions, as in the spin-valve superlattices. The mechanism of huge magnetoresistive effect in the...
Qu, Zhe, Spinu, Leonard, Yuan, Huiqiu, Dobrosavljevic, Vladimir, Bao, Wei, Lynn, Jeffrey W., ...
We report an unusual nearly ferromagnetic, heavy-mass state with a surprisingly large Wilson ratio $R_{\textrm{w}}$ (e.g., $R_{\textrm{w}}\sim$ 700 for $x =$ 0.2) in double layered ruthenates...
The Fincher-Burke spin excitations and omega/T scaling in the insulating 5% Sr-doped La2CuO4 (2007)
Bao, Wei, Chen, Ying, Yamada, K., Savici, A. T., Russo, P. L., Lorenzo, J. E., ...
Insulating La1.95Sr0.05CuO4 shares with superconducting cuprates the same Fincher-Burke-like spin excitations, which usually are observed in itinerant antiferromagnets. The local spectral function...
Wilson, Stephen D., Li, Shiliang, Dai, Pengcheng, Bao, Wei, Chung, Jae-Ho, Kang, H. J., ...
We use inelastic neutron scattering to explore the evolution of the low energy spin dynamics in the electron-doped cuprate Pr0.88LaCe0.12CuO4-d (PLCCO) as the system is tuned from its...
Magnetic transition and magnetic structure of Sr4Ru3O10 (2006)
Bao, Wei, Mao, Z. Q., Zhou, M., Hooper, J., Lynn, J. W., Freitas, R. S., ...
We have investigated the magnetic transition and magnetic structure of triple-layered ruthenate Sr4Ru3O10 directly using neutron scattering techniques. Only one ferromagnetic phase is observed, and...
Slow spin-glass and fast spin-liquid components in quasi-two-dimensional La2(Cu,Li)O4 (2005)
Chen, Y., Bao, Wei, Qiu, Y., Lorenzo, J. E., Sarrao, J. L., Ho, D. L., ...
In conventional spin glasses, magnetic interaction is not strongly anisotropic and the entire spin system is believed to be frozen below the spin-glass transition temperature. In La2Cu0.94Li0.06O4,...
Novel Coexistence of Superconductivity with Two Distinct Magnetic Orders (2005)
Christianson, A. D., Llobet, A., Bao, Wei, Gardner, J. S., Swainson, I. P., Lynn, J. W., ...
The heavy fermion Ce(Rh,Ir)In5 system exhibits properties that range from an incommensurate antiferromagnet on the Rh-rich end to an exotic superconductor on the Ir-rich end of the phase diagram. At...
Partial spin freezing in the quasi-two-dimensional La2(Cu,Li)O4 (2005)
Chen, Y., Bao, Wei, Qiu, Y., Lorenzo, J. E., Sarrao, J. L., Ho, D. L., ...
In conventional spin glasses, the magnetic interaction is not strongly anisotropic and the entire spin system freezes at low temperature. In La2(Cu,Li)O4, for which the in-plane exchange interaction...
Anomalous critical behavior near the quantum critical point of a hole-doped La2CuO4 (2004)
Chen, Y., Bao, Wei, Lorenzo, J. E., Stunault, A., Sarrao, J. L., Park, S., ...
The Landau-Ginzburg-Wilson paradigm for critical phenomena is spectacularly successful whenever the critical temperature is finite and all fluctuation modes, with characteristic energies much smaller...
Novel dynamic scaling regime in hole-doped La2CuO4 (2003)
Bao, Wei, Chen, Y., Qiu, Y., Sarrao, J. L.
Only 3% hole doping by Li is sufficient to suppress the long-range 3-dimensional (3D) antiferromagnetic order in La2CuO4. The spin dynamics of such a 2D spin liquid state at T
Magnetic structure of antiferromagnetic NdRhIn5 (2002)
Chang, S., Pagliuso, P. G., Bao, Wei, Gardner, J. S., Swainson, I. P., Sarrao, J. L., ...
The magnetic structure of antiferromagnetic NdRhIn5 has been determined using neutron diffraction. It has a commensurate antiferromagnetic structure with a magnetic wave vector (1/2,0,1/2) below T_N...
Spin dynamics in a hole-doped S=1/2 Heisenberg antiferromagnet with a disordered ground state (2002)
Only 3% hole doping by Li is sufficient to suppress the long-range antiferromagnetic order in La2CuO4. Spin dynamics in such a disordered state was investigated with measurements of the dynamic...
Magnetic Properties of Heavy Fermion Superconductors CeRhIn5 and Ce2RhIn8 (2002)
Bao, Wei, Aeppli, G., Christianson, A. D., Fisk, Z., Hundley, M. F., Larcerda, A. H., ...
Some recent neutron scattering works on CeRhIn5 and Ce2RhIn8, together with related resistivity and specific heat measurements, are summarized. In spite of its layered crystal structure, CeRhIn5 is...
Effect of La doping on magnetic structure in heavy fermion CeRhIn5 (2001)
Bao, Wei, Christianson, A. D., Pagliuso, P. G., Sarrao, J. L., Thompson, J. D., Lacerda, A. H., ...
The magnetic structure of Ce0.9La0.1RhIn5 is measured using neutron diffraction. It is identical to the incommensurate transverse spiral for CeRhIn5, with a magnetic wave vector q_M=(1/2,1/2,0.297),...
Effect of pressure on magnetic structure in heavy fermion CeRhIn5 (2001)
Bao, Wei, Trevino, S. F., Lynn, J. W., Pagliuso, P. G., Sarrao, J. L., Thompson, J. D., ...
The effect of hydrostatic pressure on the incommensurate antiferromagnetic structure of CeRhIn5 is investigated with neutron diffraction using a He pressure cell. At 3.8 kbar, the staggered magnetic...
Anisotropic three-dimentional magnetic fluctuations in heavy fermion CeRhIn5 (2001)
Bao, Wei, Aeppli, G., Lynn, J. W., Pagliuso, P. G., Sarrao, J. L., Hundley, M. F., ...
CeRhIn5 is a heavy fermion antiferromagnet that orders at 3.8 K. The observation of pressure-induced superconductivity in CeRhIn5 at a very high Tc of 2.1 K for heavy fermion materials has led to...
Magnetic Structure of Heavy Fermion Ce2RhIn8 (2001)
Bao, Wei, Pagliuso, P. G., Sarrao, J. L., Thompson, J. D., Fisk, Z., Lynn, J. W.
Magnetic structure of the heavy fermion antiferromagnet Ce2RhIn8 is determined using neutron diffraction.
Phase transition in a magnetic field in V2-yO3 (y=0 and 0.04) (2000)
Bao, Wei, Lacerda, A H, Thompson, J D, Honig, J M, Metcalf, P
The effect of a magnetic field on the two long-range-ordered magnetic phases, the collinear insulating antiferromagnetic (AFI) and the incommensurate metallic transverse spin density wave (SDW), is...
Incommensurate magnetic structure of CeRhIn5 (2000)
Bao, Wei, Pagliuso, P. G., Sarrao, J. L., Thompson, J. D., Fisk, Z., Lynn, J. W., ...
The magnetic structure of the heavy fermion antiferromagnet CeRhIn5 is determined using neutron diffraction. We find a magnetic wave vector q_M=(1/2,1/2,0.297), which is temperature independent up to...
Tunneling of the Mn12-acetate spin cluster (2000)
Bao, Wei, Robinson, R. A., Friedman, J. R., Casalta, H., Rumberger, E., Hendrickson, D. N.
The term in spin Hamiltonian, which determines the quantum tunneling rate in Mn12, is measured with neutron scattering. It is much smaller than previously reported values. This may imply that other...
Commensurate dynamic magnetic correlations in La2(Cu,Li)O4 (1999)
Bao, Wei, McQueeney, R. J., Heffner, R., Sarrao, J. L., Dai, P., Zarestky, J. L.
When sufficient numbers of holes are introduced into the two-dimensional CuO2 square lattice, dynamic magnetic correlations become incommensurate with underlying lattice in all previously...
Unconventional ferromagnetic and spin-glass states of the reentrant spin glass Fe0.7Al0.3 (1998)
Bao, Wei, Raymond, S., Shapiro, S. M., Motoya, K., Fak, B., Erwin, R. W.
Spin excitations of single crystal Fe0.7Al0.3 were investigated over a wide range in energy and reciprocal space with inelastic neutron scattering. In the ferromagnetic phase, propagating spin wave...
Bao, Wei, Broholm, C., Aeppli, G., Carter, S. A., Dai, P., Rosenbaum, T. F., ...
Magnetic correlations in all four phases of pure and doped vanadium sesquioxide V_2O_3 have been examined by magnetic thermal neutron scattering. While the antiferromagnetic insulator can be...
Bao, Wei, Broholm, C., Aeppli, G., Dai, P., Honig, J. M., Metcalf, P.
Spin correlations in metallic and insulating phases of $V_2O_3$ and its derivatives are investigated using magnetic neutron scattering. Metallic samples have incommensurate spin correlations varying...
Impact of Charge Ordering on Magnetic Correlations in Perovskite (Bi,Ca)MnO_3 (1996)
Bao, Wei, Axe, J. D., Chen, C. H., Cheong, S-W.
Single crystalline (Bi,Ca)MnO3 (74< %Ca