Quantum Materials Group

Neutron
Scattering

X-ray
Scattering

Muon Spin
Relaxation

Synthesis and
Characterization of
New Materials

Laue Camera

Our group has access to a real-time Laue camera system, using a Cu radiation x-ray source. We use this for the characterization and alignment of crystals grown in our lab.

Publications in Preparation

Orbital ordering transition in Sr2VO4 (2007)
PH. D. Zhou, B. S. Conner, L. Balicas, and C. R. Wiebe.
Accepted for publication in Physical Review Letters.

Non-Refereed Publications

Unconventional Superconductivity in Na_0.35CoO₂ ·1.3 H₂O and proximity to a magnetically ordered phase, cond-mat/0404235 (2004)
Y. J. Uemura, P.L. Russo, A.T. Savici, C. R. Wiebe, G. J. MacDougall, G. M. Luke, M. Mochizuki, Y. Yanase, M. Ogata, M. L. Foo, R. J. Cava.

Refereed Publications

	The origin of persistent spin dynamics and residual entropy in the stuffed spin ice Ho2.3Ti1.7O7-d (2007) H. D. Zhou, C. R. Wiebe, Y. J. Jo, L. Balicas, Y. Qiu, J. R. D. Copley, G. Ehlers, P. Fouquet, and J. S. Gardner. J. Phys. Cond. Matter, 19, 342201.
	Probing multiferroicity and spin-spin interactions via angular dependent dielectric measurements on Y-doped HoMnO3 in high magnetic fields (2007) R. Vasic, H. D. Zhou, J. S. Brooks, and C. R. Wiebe. Journal of Applied Physics, 101, 09M102.
	Relief of frustration through spin disorder in multiferroic Ho1-xYxMnO3 (2007) H. D. Zhou, J. Lu, R. Vasic, B. W. Vogt, J. A. Janik, J. S. Brooks, and C. R. Wiebe. Phys. Rev. B, 75, 132406.
	Doping through the percolation limit in GeNi2-xCoxO4 (2007) H. D. Zhou, A. Kiss, J. A. Janik, and C. R. Wiebe. J. Phys. Cond. Matter, 19, 156202.
	Gapped itinerant spin excitations account for missing entropy in the hidden-order state of URu2Si2 (2007) C. R. Wiebe, J. A. Janik, G. J. MacDougall, G. M. Luke, J. D. Garrett, H. D. Zhou, Y.-J. Jo, L. Balicas, Y. Qiu, J. R. D. Copley, Z. Yamani, and W. J. L. Buyers. Nature Physics, 3, 96-99.
	Probing multiferroicity and spin-spin interactions via dielectric measurements on Y-doped HoMnO3 in high magnetic fields (2007) R. Vasic, H. D. Zhou, E. Jobiliong, C. R. Wiebe and J. S. Brooks. Phys. Rev. B, 75, 014436.
	Muon Spin Relaxation Study of Superconducting Bi2201 (2007) P. L. Russo, C. R. Wiebe, Y. J. Uemura, A. T. Savici, G. J. MacDougall, J. Rodriguez, G. M. Luke, N. Kaneko, M. Greven, O. P. Vajk, Y. Ando, K. Fujita, K. M. Kojima, S. Uchida. Phys. Rev. B, 75, 054511.
	Specific heat of geometrically frustrated and multiferroic RMn1-xGaxO3 (R = Ho, Y) (2006) H. D. Zhou, J. A. Janik, B. W. Vogt, Y. J. Jo, L. Balicas, M. J. Case, C. R. Wiebe, J. C. Denyszyn, J. B. Goodenough, J. G. Cheng. Phys. Rev. B, 74, 094426.
	Muon Spin Rotation Study of MgCNi₃(2005) G. J. MacDougall, R. J. Cava, S.-J. Kim, P. L. Russo, A. T. Savici, C. R. Wiebe, A. Winkels, Y. J. Uemura, and G. M. Luke. Physica B, 374, 263-266.
	Muon Spin Rotation Study of Field Induced Magnetism in Heavily Overdoped La_2-xSr_xCuO₄(2005) G. J. MacDougall, R. J. Birgeneau, H. Kim, S.-J. Kim, J. Rodriguez, P. L. Russo, A. T. Savici, Y. J. Uemura, S. Wakimoto, C. R. Wiebe, and G. M. Luke. Physica B, 374, 211-214.
	µSR study of the “anti-glass” LiHo_0.045Y _0.955F₄ (2005) J. Rodriguez, S. R. Dunsiger, J. B. Kycia, G. J. MacDougall, J. A. Quilliam, P. L. Russo, A. T. Savici, Y. J. Uemura, C. R. Wiebe, and G. M. Luke. Physica B, 374, 13-16.
	2D Kagomé Ordering in the 3D Frustrated Spinel Li₂Mn₂O₄(2005) C. R. Wiebe, P. L. Russo, A. T. Savici, Y. J. Uemura, G. J. MacDougall, G. M. Luke, S. Kuchta, J. E. Greedan. J. Phys. Cond. Matt., 17, 6469-6482.
	Muon Spin Relaxation Studies of Field-Induced Effects in High-T_C Superconductors (2005) A. T. Savici, A. Fukaya, I.-M. Gat-Malureanu, T. Ito, P.L. Russo, Y. J. Uemura, C. R. Wiebe, et al. Phys. Rev. Letters, 95, 157001.
	Field-induced antiferromagnetic order in Pr_2-xCe_xCuO₄(2004) J. E. Sonier, K. F. Poon, G. M. Luke, P. Kyriakou, R. I. Miller, R. Liang, C. R. Wiebe, P. Fournier, R. L. Greene. Physica B, 408, 783.
	Magnetic ordering in the spin-ice candidate Ho₂Ru₂O₇(2004) C. R. Wiebe, J. S. Gardner, S.-J. Kim, G. M. Luke, A. S. Wills, J. E. Greedan, I. Swainson, Y. Qiu, C. Jones. Phys. Rev. Letters, 93, 076403.
	Hidden orbital currents and spin gap in the heavy fermion superconductor URu₂Si₂(2004) C. R. Wiebe, G. M. Luke, Z. Yamani, A. A. Menovsky, W. J. L. Buyers. Phys. Rev. B, 69, 132418.
	Frustration-driven Spin Freezing in the S=1/2 FCC Perovskite Sr₂MgReO₆(2003) C. R. Wiebe, J. E. Greedan, P. P. Kyriakou, G. M. Luke, J. S, Gardner, I. M. Gat-Malureanu, P. L. Russo, A. T. Savici, Y. J. Uemura. Phys. Rev. B, 68,134410.
	Superconductivity and Field-Induced Magnetism in Pr_2-xCe_xCuO₄ Single Crystals (2003) J. E. Sonier, K. F. Poon, G. M. Luke, P. P. Kyriakou, R. I. Miller, R. Liang, C. R. Wiebe, P. Fournier, R. L. Greene. Phys. Rev. Letters, 91, 147002.
	Field dependence of muon spin relaxation rate in MnSi (2003) I. M. Gat-Malureanu, A. Fukaya, M. I. Larkin, A. J. Millis, P. L. Russo, A. T. Savici, Y. J. Uemura, P. P. Kyriakou, G. M. Luke, C. R. Wiebe, Y. V. Sushko, R. H. Heffner, D. E. MacLaughlin, D. Andreica, A. Schenck, G. M. Kalvius. Phys. Rev. Letters, 90, 157201.
	Synthesis, structure, and magnetic properties of the pillared perovskites La₅Re₃MO₁₆ (M = Mg, Fe, Co, Ni) (2003) L. Chi, A. E. C. Green, R. Hammond, C. R. Wiebe, J. E. Greedan. Journal of Solid State Chemistry, 170, 165.
	Spin and Lattice Excitations in the heavy-fermion superconductor UNi₂Al₃(2002)B. D. Gaulin, M. Mao, C. R. Wiebe, Y. Qui, S. M. Shapiro, C. Broholm, S.-H. Lee, J. D. Garrett. Phys. Rev. B, 66, 174520.
	Neutron Scattering Studies of the Geometrically Frustrated Spinel, LiMn₂O₄(2002) J. E. Greedan, C. R. Wiebe, A. S. Wills, J. R. Stewart. Phys. Rev. B, 65, 184424.
	Spin Glass Behavior in the S = ½ FCC Ordered Perovskite Sr₂CaReO₆(2002) C. R. Wiebe, G. M. Luke, J. E. Greedan, J. S. Gardner.Phys. Rev. B, 65. 155325.
	Magnetism and the Magnetic Structure of the Pillared Perovskite La₅Re₃MnO₁₆(2002) A. E. G. Green, C. R. Wiebe, J. E. Greedan. Solid State Sciences, 4, 305.
	The Effect of Interlayer Cations on the Magnetic Properties of the Mixed-Metal Pnictide Oxides: A₂MnZn₂As₂O₂ (A = Ba, Sr) (2001) T. C. Ozawa, S. M. Kauzlarich, M. Bieringer, C. R. Wiebe, J. E. Greedan, and J. S. Gardner. Chem. Mater., 13, 973.
	Charge and Magnetic Ordering in the Electron-Doped Magnetoresistive Materials CaMnO_3-d (d = 0.06, 0.11) (2001) C. R. Wiebe, J. E. Greedan, J. S. Gardner, Z. Zeng, and M. Greenblatt. Phys. Rev. B, 64, 064221.
	Synthesis, Structure, and Magnetic Behavior of La₅Re₃MnO₁₆: A New Perovskite - Like Material (2000) C. R. Wiebe, A. Gourrier, T. Langet, J. F. Britten, and J. E. Greedan. Journal of Solid State Chemistry, 151, 31.
	An Investigation of Porous Silicon by Means of Positron-Annihilation (2000) S. Dannefaer, C. Wiebe, and D. Kerr. Journal of Porous Materials, 7, 323.
	Positron-Annihilation Investigation of Porous Silicon Heat-Treated to 1000 ^o C (1998) S. Dannefaer, C. Wiebe, and D. Kerr. Journal of Applied Physics, 84, 6559.
	First-Order Transition to a Noncollinear Antiferromagnetic Structure in U₂Rh₃Si₅(1997) R. Feyerherm, C. R. Wiebe, B. D. Gaulin, M. F. Collins, B. Becker, R. W. A. Hendrikx, T. J. Gortenmulder, G. J. Nieuwenhuys, and J. A. Mydosh. Phys. Rev. B, 56, 13693.