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Search Publications by: Yiming Qiu (Fed)

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Displaying 51 - 75 of 84

One Dimensional(1D)-to-2D Crossover of Spin Correlations in the 3D Magnet ZnMn 2 O 4

December 8, 2015
Author(s)
Steven M.T. Disseler, Ying Chen, S. Yeo, G. Gasparovic, P.M.B. Piccoli, A. J. Schultz, Yiming Qiu, Qingzhen Huang, S.-W. Cheong, William D. Ratcliff
We report on the intriguing evolution of the dynamical spin correlations of the frustrated spinel ZnMn 2O 4. Inelastic neutron scattering and magnetization studies reveal that the dynamical correlations at high temperatures are 1D. At lower temperature

Magnetic Order in a-RuCl 3 : A Honeycomb-Lattice Quantum Magnet with Strong Spin-Orbit Coupling

April 24, 2015
Author(s)
J. A. Sears, M. Songvilay, K. W. Plumb, J. P. Clancy, Yiming Qiu, Yang Zhao, Daniel E. Parshall, Young-June Kim
We report magnetic and thermodynamic properties of single crystal α-RuCl 3, in which the Ru 3+ (4d 5) ion is in its low spin state and forms a honeycomb lattice. Two features are observed in both magnetic susceptibility and specific heat data; a sharp peak

Competition Between the Inter- and Intra-sublattice Interactions in Yb 2 V 2 O 7

February 27, 2015
Author(s)
Z. L. Dun, J. Ma, H. B. Cao, Yiming Qiu, John R. Copley, T. Hong, M. Matsuda, J. G. Cheng, M. Lee, E. S. Choi, S. Johnston, H. D. Zhou
We studied single crystals of Yb 2V 2O 7 using dc and ac susceptibility measurements, elastic and inelastic neutron scattering measurements, and linear spin wave theory. The experimental data shows a ferromagnetic ordering of V 4+ ions at 70 K, a short

Strong Competition between Orbital-ordering and Itinerancy in a Frustrated Spinel Vanadate

January 26, 2015
Author(s)
J. Ma, J. H. Lee, S. E. Hahn, Tao Hong, H. B Cao, A. A. Aczel, Z. L. Dun, M. B. Stone, W. Tian, Yiming Qiu, John R. Copley, H. D. Zhou, R. S. Fishman, M. Matsuda
The crossover from localized- to itinerant-electron behavior is associated with many intriguing phenomena such as metal-insulator transitions [1], colossal magnetoresistance [2], and superconductivity in heavy fermion [3] and Fe-based materials [4]

Polaron-Mediated Spin Correlations in Metallic and Insulating La 1-x A x MnO 3 (A=Ca,Sr, or Ba)

December 3, 2014
Author(s)
Joel Helton, Daniel M Pajerowski, Yiming Qiu, Yang Zhao, Dmitry A. Shulyatev, Yakov M. Mukovskii, Georgii L. Bychkov, Sergei N. Barilo, Jeffrey W. Lynn
Neutron spectroscopy measurements reveal short-range spin correlations near and above the ferromagnetic-paramagnetic phase transition in manganite materials of the form La 10zA xMnO 3, including samples with an insulating ground state as well as colossal

Short-Range Magnetic Correlations in the Highly-Correlated Electron Compound CeCu 4 Ga

September 25, 2014
Author(s)
B. G. Ueland, C. F. Miclea, K. Gofryk, Yiming Qiu, F. Ronning, R. Movshovich, E. D. Bauer, J. S. Gardner, J. D. Thompson
We report results from experiments on the heavy-electron compound CeCu 4Ga which show that it possesses short-range magnetic correlations down to a temperature of T = 0.1 K. A peak occurs in the specific heat at T* = 1.2 K, but the specific heat remains

Temperature and Magnetic Field Dependence of Spin-Ice Correlations in the Pyrochlore Magnet Tb^2^Ti 2 O 7

July 23, 2014
Author(s)
K. Fritsch, E. Kermarrec, Kathryn Aileen Ross, Yiming Qiu, John R. Copley, D. Pomaranski, J. B. Kycia, H. A. Dabkowska, B. D. Gaulin
We present a parametric study of the diffuse magnetic scattering at (1/2, 1/2, 1/2}) positions in reciprocal space, ascribed to a frozen antiferromagnetic spin ice state in single crystalline Tb 2Ti 2O 7. Our high-resolution neturon scattering measurements

Magnetic Ordering induced by Interladder Coupling in the Spin-1/2 Heisenberg Two-leg Ladder Antiferromagnet C 9 H 18 N 2 CuBr 4

May 30, 2014
Author(s)
Tao Hong, K. P. Schmidt, K. Coester, F.F. Awwadi, M.M. Turnbull, Yiming Qiu, Jose Rodriguez Rivera, M. Zhu, X. Ke, C.P. Aoyama, Y. Takano, Huibo Cao, W. Tian, J. Ma, R. Custelcean, H.D. Zhou, M. Matsuda
We present specific-heat and neutron-scattering results for the S=1/2 quantum antiferromagnet (dimethylammonium)(3,5-dimethylpyridinim)CuBr 4. The material orders magnetically at Τ N=1.99(2)K, and magnetic excitations are accompanied by an energy gap of 0

Liquidlike Correlations in Single-Crystalline Y 2 Mo 2 O 7 : An Unconventional Spin Glass

February 27, 2014
Author(s)
H. J. Silverstein, K. Fritsch, F. Flicker, A. M. Hallas, Jason S. Gardner, Yiming Qiu, G. Ehlers, A. T. Savici, Z. Yamani, K. A. Ross, B. D. Gaulin, M. J. P. Gingras, J. A. M. Paddison, K. Foyevtsova, R. Valenti, F. Hawthorne, C. R. Wiebe, H. D. Zhou
The phenomenon of melting is among one of the most well studied phase transitions in condensed matter science. Even though the process is well-understood is a number of materials including simple metals, nanoparticles, ionic and molecular solids, and

Order by Disorder Spin Wave Gap in the XY Pyrochlore Magnet Er 2 Ti 2 O 7

February 4, 2014
Author(s)
Kathryn Aileen Ross, Yiming Qiu, John R. Copley, H. A. Dabkowska, B. D. Gaulin
The recent determination of a robust spin Hamiltonian for the anti-ferromagnetic XY pyrochlore Er 2Ti 2O 7 reveals a most convincing case of the ¿order by quantum disorder¿ (ObQD) mechanism for ground state selection. This mechanism relies on quantum

Intertwining of Frustration with Magneto-Elastic Coupling in the Multiferroic LuMnO 3

December 25, 2013
Author(s)
Shin-ichiro Yano, Despina Louca, Songxue Chi, Masaaki Matsuda, Yiming Qiu, John R. Copley, Sang-Wook Cheong
Residual magnetic frustration in the multiferroic LuMNO 3 may be key towards understanding magneto-elastic coupling in hexagonal manganites. Critical magnetic scattering present well above the magnetic ordering temperature Τ N persists below, as observed

Successive Phase Transitions and Extended Spin-Excitation Continuum in the S=1/2 Triangular-Lattice Antiferromagnet Ba 3 CoSb 2 ) 9

December 26, 2012
Author(s)
H. D. Zhou, Cenke Xu, A. M. Hallas, H. J. Silverstein, C. R. Wiebe, I. Umegaki, J. Q. Yan, T. P. Murphy, J.-H. Park, Yiming Qiu, John R. Copley, Jason S. Gardner, Y. Takano
Using magnetic, thermal and neutron measurements on single-crystal samples, we show that Ba 3CoSb 2O 9 is a spin-1/2 triangular-lattice antiferromagnet with easy-axis anisotropy and two magnetic phase transitions bracketing an intermediate up-up-down phase

Structural Irreversibility in Enhanced Brittleness under Fatigue in Zr-Based Amorphous Solids

December 19, 2012
Author(s)
Peng Tong, Despina Louca, Gongyao Wang, Peter K. Liaw, Yoshihiko Yokoyama, Anna Llobet, Hiroshi Kawaji, Yiming Qiu, Yunfeng Shi
Amorphous metals are solid metallic materials devoid of periodicity, with disordered atomic structures achieved by supercooling the viscous liquid to avoid crystallization. Whilst trapped in this supercooled state with an atomic topology that resembles

Magnetic Order and Fluctuations in the Presence of Quenched Disorder in the Kagome Staircase System (Co 1-x Mg x ) 3 V 2 O 8

November 21, 2012
Author(s)
K. Fritsch, Zahra Yamani, S. Chang, Yiming Qiu, John R. Copley, M. Ramazanoglu, H. A. Dabkowska, B. D. Gaulin
Co 3V 2O 8 is an orthorhombic magnet in which S=3/2} magnetic moments reside on two crystallographically inequivalent Co 2+ sites, which decorate a stacked, buckled version of the two dimensional kagome lattice, the stacked kagome staircase. The magnetic

Magnetic Field-Induced Instability of the Cooperative Paramagnetic State in Zn x Co 4-x (OD) 6 Cl 2

May 29, 2012
Author(s)
S. E. Dissanayake, C. Chan, S. Ji, J. Lee, Yiming Qiu, K. C. Rule, B. Lake, Mark Green, M. Hagihala, X. G. Zheng, T. K. Ng, S.-H. Lee
Using elastic and inelastic neutron scattering techniques with and without application of an external magnetic field H, the magnetic ground states of Zn xCo 4-x(OD) 6Cl 2 (x=0,1) were studied. Our results show that for x=0, the ground state is a magnetic

Magnetic Excitations in the Geometric Frustrated Multiferroic CuCrO 2

September 28, 2011
Author(s)
M. Frontzek, J. T. Haraldsen, A. Podlesnyak, M. Matsuda, A. D. Christianson, R. S. Fishman, A. S. Sefat, Yiming Qiu, John R. Copley, S. Barilo, S. V. Shiryaev, G. Ehlers
In this paper detailed neutron scattering measurements of the magnetic excitation spectrum of CuCrO6d2^ in the ordered state below T N1 = 24.2 K are presented. The spectra are analyzed using a model Hamiltonian which includes interlayer-exchanged up to the

Absence of Long-Range Ordering in the Pyrochlore Compound Er 2 Sn 2 O 7

September 2, 2011
Author(s)
P. M. Sarte, H. J. Silverstein, B. T. K. Van Wyk, Jason S. Gardner, Yiming Qiu, H. D. Zhou, C. R. Wiebe
The low temperature behavior of powder Er 2Sn 2O 7 samples has been studied by magnetic susceptibility, heat capacity, and neutron scattering experiments. We report here the presence of no magnetic ordering down to 100 mK. Anomalies in the heat capacity

Short-Range Ordering in the Modified Honeycomb Lattice Compound SrHo 2 O 4

April 17, 2011
Author(s)
S Ghosh, H. D. Zhou, L. Balicas, Jason S. Gardner, Yiming Qiu, C. R. Wiebe
The low temperature behaviour of single crystalline SrHo 2O 4 has been characterized by DC mag- netic susceptibility, heat capacity, and neutron scattering experiments. Our results show that despite the lack of magnetic long-ranged ordering in the presence

Spin Liquid State in the S = 1/2 Triangular Lattice Ba 3 CuSb 2 O 9

April 6, 2011
Author(s)
H. D. Zhou, E. S. Choi, G. Li, L. Balicas, C. R. Wiebe, Yiming Qiu, John R. Copley, Jason S. Gardner
Spin liquids remain one of the most important objects of study in modern solid state physics as model systems of quantum magnetism. In this paper, we report the synthesis and characterization of a new spin liquid candidate, Ba 3CuSb 2O 9, which has a

Neutron Scattering Study of a Quasi-2D Spin-1/2 Dimer System Piperazinium Hexachlorodicuprate Under Hydrostatic Pressure

November 22, 2010
Author(s)
Tao Hong, Chris Stock, I. Cabrera, Collin L. Broholm, Yiming Qiu, Juscelino Leao, Sarah Poulton, John R. Copley
We report inelastic neutron scattering study of a quasi-two-dimensional S=1/2 dimer system Piperazinium Hexachlorodicuprate under hydrostatic pressure. The spin gap δ becomes softened with the increase of the hydrostatic pressure while the bandwidth of the

Level Crossings and Zero-Field Splitting in the Cr 8 }-Cubane Spin-cluster by Inelastic Neutron Scattering and Magnetization Studies

November 17, 2010
Author(s)
David Vaknin, V. O. Garlea, F. Demmel, E. Mamontov, H. Nojiri, C. Martin, I. Chiorescu, Yiming Qiu, P. Kogerler, J. Fielden, L. Engelhardt, M. Luban, M. Luban
Millikelvin inelastic neutron scattering in variable magnetic field and high-field magnetization measurements were performed to gain insight into the low-energy magnetic excitation spectrum and the field-induced level crossings in the molecular spin