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Search Publications by: Yiming Qiu (Fed)

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Displaying 51 - 75 of 155

Continuum of Quantum Fluctuations in a Three-Dimensional S = 1 Heisenberg Magnet

January 1, 2019
Author(s)
K. W. Plumb, Hitesh J. Changlani, A. Scheie, Shu Zhang, J. W. Krizan, Jose Rodriguez Rivera, Yiming Qiu, B. Winn, R. J. Cava, Collin L. Broholm
Spin liquids are a fundamentally new phase of matter that cannot be described by a broken symmetry and have no order parameter. While the quantum entanglement that characterizes a quantum spin liquid is not directly accessible to any current measurement

Comprehensive Inelastic Neutron Scattering Study of the Multiferroic Mn 1-x Co x WO 4

December 14, 2018
Author(s)
Jinchen Wang, R. S. Fishman, Yiming Qiu, J. A. Fernandez-Baca, Georg Ehlers, K.-C. Liang, Yaqi Wang, Bernd Lorenz, C. W. Chu, Feng Ye
Using high-resolution inelastic neutron scattering, we examine the spin dynamics of Mn 1-xCo xWO 4 in the collinear AF1, the ac-b spiral AF2, and the ac spiral AF5 phases. The spin wave excitations are well described by a Heisenberg model with competing

The Nature of Spin Excitations in the One-Third Magnetization Plateau Phase of Ba 3 CoSb 2 O 9

July 10, 2018
Author(s)
Y. Kamiya, L. Ge, Tao Hong, Yiming Qiu, D. L. Quintero-Castro, Z. Lu, H. B. Cao, M. Matsuda, E. S. Choi, C. D. Batista, M. Mourigal, H. D. Zhou, J. Ma
A recent experiment revealed that the spin-1/2 triangular-lattice Heisenberg antiferromagnet Ba 3CoSb 2O 9 is a magnetically ordered material with an anomalous excitation spectrum, comprising a high-intensity excitation continuum and short-lived magnons

Local Quantum Phase Transition in YFe 2 Al^d10

July 3, 2018
Author(s)
W. J. Gannon, L. S. Wu, I. A. Zaliznyak, W. H. Xu, A. M. Tsvelik, Yiming Qiu, Jose Rodriguez Rivera, M. C. Aronson
A phase transition occurs when correlated regions of a new phase grow to span the system and the fluctuations within the correlated regions become long-lived. Here we present neutron scattering measurements showing that this conventional picture must be

Naturally Tuned Quantum Critical Point in the S = 1 Kagome YCa 3 (VO) 3 (BO 3 ) 4

April 26, 2018
Author(s)
Harlyn J. Silverstein, Ryan Sinclair, Arzoo Sharma, Yiming Qiu, Ivo Heinmaa, Alexander Leitmae, Christopher R. Wiebe, R. Stern, Haidong Zhou
Although S = 1/2 kagome systems have been intensely studied theoretically, and within the last decade been realized experimentally, much less is known about the S = 1 analogues. While the theoretical ground state is still under debate, it has been found

Screened Moments and Extrinsic In-Gap States in Samarium Hexaboride

April 18, 2018
Author(s)
W. T. Fuhrman, J. R. Chamorro, P. A. Alekseev, J.-M. Mignot, T. Keller, Jose Rodriguez Rivera, Yiming Qiu, P. Nikolic, T. M. McQueen, Collin L. Broholm
The Kondo impurity effect in metals is the result of quantum-mechanical scattering of conduction electrons by magnetic impurities. 1 This process leads to exotic effects such as unconventional superconductivity and an effective electron mass enhanced by 2

Quantum Critical Singularities in Two-Dimensional Metallic XY Ferromagnets

February 20, 2018
Author(s)
Chandra M. Varma, W. J. Gannon, M. C. Aronson, Jose Rodriguez Rivera, Yiming Qiu
An important problem in contemporary physics concerns quantum-critical fluctuations in metals. A scaling function for the momentum, frequency, temperature and magnetic field dependence of the correlation function near a 2D-ferromagnetic quantum-critical

Doping-Induced Redistribution of Magnetic Spectral Weight in the Substituted Hexaborides Ce 1-x La x B 6 and Ce 1-x Nd x B 6

February 9, 2018
Author(s)
S. E. Nikitin, P. Y. Portnichenko, A. V. Dukhnenko, N.Yu. Shitsevalova, V. B. Filipov, Yiming Qiu, Jose Rodriguez Rivera, J. Ollivier, D. S. Inosov
We investigate the doping-induced changes in the electronic structure of CeB 6 on a series of substituted Ce 1-xR xB 6 and Ce 1-xNd xB 6 samples (R = La,Nd) using diffuse neutron scattering. We observe a redistribution of magnetic spectral weight across

Nonreciprocal Magnons and Symmetry-Breaking in the Noncentrosymmetric Antiffomagnet

July 24, 2017
Author(s)
G. Gitgeatpong, Yang Zhao, P. Piyawongwatthana, Yiming Qiu, Leland Harriger, Nicholas Butch, T. J. Sato, K. Matan
Magnons, the spin-wave quanta, are disturbances that embody a wave propagating through a back-ground medium formed by ordered magnetic moments. In an isotropic Heisenberg system, these disturbances vary in a continuous manner around an ordered spin

Higgs Amplitude Mode in a Two-Dimensional Quantum Antiferromagnet near the Quantum Critical Point0

July 4, 2017
Author(s)
Tao Hong, Masashige Matsumoto, Yiming Qiu, Wangchun Chen, Thomas R. Gentile, Shannon M. Watson, Firas F. Awwadi, Mark M. Turnbull, Sachith E. Dissanayake, Harish Agrawal, Rasmus Toft-Petersen, Bastian Klemke, Kris Coester, Kai P. Schmidt, David A Tennant
Spontaneous symmetry-breaking quantum phase transitions play an essential role in current condensed matter physics 1-3. The collective excitations in the broken-symmetry phase near the quantum critical point can be characterized by fluctuations of phase

Field Induced Spontaneous Quasiparticle Decay and Renormalization of Quasiparticle Dispersion in a Quantum Antiferromagnet

May 5, 2017
Author(s)
Tao Hong, Yiming Qiu, M. Matsumoto, D. A. Tennant, K. Coester, K. P. Schmidt, F.F. Awwadi, M. M. Turnbull, H. Agrawal, A. L. Chernyshev
We present the fine-resolution neutron scattering study in magnetic fields applied perpendicular to an easy-axis (Ising type) on the S=1/2 coupled two-leg ladder antiferromagnet (dimethylammonium)(3,5-dimethylpyridinium)CuBr 4. At finite fields, the

Disordered Route to the Coulomb Quantum Spin Liquid: Random Transverse Fields on Spin Ice in Pr 2 Zr 2 O 7

March 8, 2017
Author(s)
J.-J. Wen, S.M. Koohpayeh, K. A. Ross, B. A. Trump, T. M. McQueen, K. Kimura, S. Nakatsuji, Yiming Qiu, D. M. Pajerowski, John R. Copley, Collin L. Broholm
Inelastic neutron scattering reveals a broad continuum of excitations in Pr 2Zr 2O 7, the temperature and magnetic field dependence of which indicate a continuous distribution of quenched transverse fields (Δ}) acting on the non-Kramers Pr 3+ crystal
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