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Search Publications by: Nicholas Butch (Fed)

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Displaying 51 - 75 of 80

Observation of Plasmon-Phonons in a Metamaterial Superconductor using Inelastic Neutron Scattering

July 24, 2019
Author(s)
Vera N. Smolyaninova, Jeffrey W. Lynn, Nicholas Butch, Heather H. Chen-Mayer, Joseph C. Prestigiacomo, M. S. Osofsky, Igor I. Smolyaninov
Recent experiments have demonstrated that the metamaterial approach is capable of drastically increasing the critical temperature, T c, of composite metal-dielectric epsilon near zero (ENZ) metamaterial superconductors. For example, a tripling of the

Quantum Spin Ice Dynamics in the Dipole-Octupole Pyrochlore Magnet Ce 2 Zr 2 O 7

May 7, 2019
Author(s)
Jonathan Gaudet, E. M. Smith, J. Dudemaine, J. Beare, C.R.C. Buhariwalla, Nicholas Butch, M. B. Stone, A. I. Kolesniko, Guangyong Xu, D. R. Yahne, K. A. Ross, C. A. Marjerrison, J. D. Garrett, G. M. Luke, A. D. Bianchi, B. D. Gaulin
Neutron scattering measurements on the pyrochlore magnet Ce 2Zr 2O 7 reveal an unusual crystal field splitting of its lowest J=5/2 multiplet, such that its ground state doublet is composed of m j= ± 3/2, giving these doublets a dipole - octupole (DO)

New Insights into Water Dynamics of Portland Cement Paste with Nano-Additives using Quasielastic Neutron Scattering

March 1, 2019
Author(s)
Kunal Kupwade-Patil, Ali Bumajdad, Craig Brown, Madhu Sudan Tyagi, Nicholas Butch, Abdullah F. Jamsheer, Oral Buyukozturk
Early age hydration kinetics of Portland cement with nano additives such as nano-silica (NS) was examined using quasielastic neutron scattering (QENS). Cement pastes with different ratios of Portland cement to NS was prepared. The concentration of the NS

High Temperature Singlet-Based Magnetism from Hund's Rule Correlations

February 7, 2019
Author(s)
Lin Miao, Rourav Basak, Sheng NMN Ran, Yishuai Xu, Erica Kotta, Haowei He, Jonathan D. Denlinger, Yi-De Chuang, Yang Zhao, Zhijun Xu, Jeffrey W. Lynn, J. R. Jeffries, Shanta Ranjan Saha, Ioannis Giannakis, Pegor Aynajian, Chang-Jong Kang, Yilin Wang, Gabriel Kotliar, Nicholas Butch, L. Andrew Wray
Novel electronic phenomena frequently form in heavy fermions as a consequence of the mutual nature of localization and itineracy of f-electrons. On the magnetically ordered side of the heavy fermion phase diagram, f-moments are expected to be localized and

Behavior of the Breathing Pyrochlore Lattice Ba 3 Yb 2 Zn 5 O 11 in Applied Magnetic Field

October 19, 2018
Author(s)
J. G. Rau, L. S. Wu, A. F. May, A. E. Taylor, I-Lin Liu, J. Higgins, Nicholas Butch, K. A. Ross, H. S. Nair, M. D. Lumsden, M. J. P. Gingras, A. D. Christianson
The breathing pyrochlore lattice material Ba 3Yb 2Zn 5O 11 exists in the nearly decoupled limit, in contrast to most other well-studied breathing pyrochlore compounds. Here we study the magnetic field dependent behavior of Ba 3Yb 2Zn 5O 11 at low

Mechanical Control of Crystal Symmetry and Superconductivity in Weyl Semimetal MoTe 2

July 30, 2018
Author(s)
Colin A Heikes, I Lin NMN Liu, Tristin Metz, Christoper Eckberg, Paul Michael Neves, Yan Wu, Linda NMN Hung, Phil Piccoli, Huibo Cao, Juscelino Leao, Johnpierre Paglione, Taner Yildirim, Nicholas P. Butch, William D. Ratcliff
The concept of topological order applied to condensed matter systems has inspired extensive experimental and theoretical searches for novel types of quantum matter. Topological superconductivity, where a bulk superconducting state and non-trivial topology

Pressure Tuning of Collapse of Helimagnetic Structure in Au 2 Mn

November 27, 2017
Author(s)
I Lin NMN Liu, Maria J. Pascale, Juscelino Leao, Craig Brown, William D. Ratcliff, Qingzhen Huang, Nicholas Butch
We identify the phase boundary between spiral spin and ferromagnetic phases in Au 2Mn at a critical pressure of 16.4 kbar, as determined by neutron diffraction, magnetization and magnetoresistance measurements. The temperature-dependent critical field at a

Phase Competition in the Palmer-Chalker XY Pyrochlore Er 2 Pt 2 O 7

October 30, 2017
Author(s)
A. M. Hallas, J. Gaudet, Nicholas Butch, Guangyong Xu, M. Tachibana, C. R. Wiebe, Graeme M. Luke, Bruce D. Gaulin
We report neutron scattering measurements on Er 2Pt 2O 7, a new addition to the XY family of frustrated pyrochlore magnets. Symmetry analysis of our elastic scattering data shows that Er 2Pt 2Od7^ is the first XY pyrochlore to order into the κ = 0,Γ 7

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

Quantum Critical Behavior in the Asymptotic Limit of High Disorder in the Medium Entropy Alloy NiCoCr 0.8

June 29, 2017
Author(s)
Brian C. Sales, Ke Jin, Hongbin Bei, John Nichols, Matthew F. Chisholm, F. May, Nicholas Butch, Andrew D. Christianson, Michael A. McGuire
Concentrated solid solutions of transition metal atoms, such as NiCoCr, have extreme chemical disorder within a simple face-centered-cubic crystal structure. These alloys can be grown as large single crystals, and are closely related to the recently

Ba 8 CoNb 6 O 24 : A Spin-1/2 Triangular-Lattice Heisenberg Antiferromagnet in the Two-Dimensional Limit

February 17, 2017
Author(s)
R. Rawl, L. Ge, H. Agrawal, Y. Kamiya, C. R. Dela Cruz, Nicholas Butch, X. F. Sun, M. Lee, E. S. Choi, J. Oitmaa, C. D. Batista, M. Mourigal, H. D. Zhou, J. Ma
The quasi-two-dimensional perovskite Ba 8CoNb 6O 24 comprises equilateral effective spin-1/2 Co 2+ triangular layers separated by six nonmagnetic Nb 5+ layers. Susceptibility, specific heat and neutron scattering measurements combined with high-temperature

Tricritical Point of the f-Electron Antiferromagnet USb 2 Driven by High Magnetic Fields

January 12, 2017
Author(s)
Ryan L. Stillwell, I Lin NMN Liu, N. Harrison, M. Jaime, J. R. Jeffries, Nicholas Butch
In pulsed magnetic fields up to 65T and at temperatures below the Neel transition, our magnetization and magnetostriction measurements reveal a field-induced metamagnetic-like transition that is suggestive of an antiferromagnetic to polarized paramagnetic

Distinct Magnetic Spectra in the Hidden Order and Antiferromagnetic Phases in URu 2-x Fe x Si 2

November 7, 2016
Author(s)
Nicholas P. Butch, Sheng Ran, Inho Jeon, Noravee Kanchanavatee, Kevin Huang, Alexander Breindel, M. Brian Maple, Ryan L. Stillwell, Yang Zhao, Leland Weldon Harriger, Jeffrey W. Lynn
We use neutron scattering to compare the magnetic excitations in the hidden order (HO) and antiferromagnetic (AFM) phases in URu 2-xFe xFe xSi 2 as a function of Fe concentration. The magnetic excitation spectra change significantly between x=0.05 and x=0

Spin-Orbit Coupled Molecular Quantum Magnetism Realized in Inorganic Solid

September 21, 2016
Author(s)
Sang-Youn Park, S.-H. Do, K.-Y. Choi, J.-H. Kang, Dongjin Jang, B. Schmidt, Manuel Brando, B.-H. Kim, D.-H. Kim, Nicholas Butch, Seongsu Lee, Sungdae Ji
The molecular magnetism, representing an isolated spin state, is of particular interest due to characteristics of quantum magnetism with quantum tunneling phenomena underlying qubits or molecular spintronics for the quantum information devices. Such

Pressure-Resistant Intermediate Valence in the Kondo Insulator SmB 6

April 15, 2016
Author(s)
Nicholas P. Butch, Johnpierre Paglione, Paul Chow, Yuming Xiao, Chris A. Marianetti, Corwin H. Booth, Jason R. Jeffries
Resonant x-ray emission spectroscopy (RXES) was used to determine the pressure dependence of the f-electron occupancy in the Kondo insulator SmB 6. Applied pressure reduces the f-occupancy, but surprisingly, the material maintains a significant divalent

Universal Dynamic Magnetism in Yb Pyrochlores with Disparate Ground States

March 14, 2016
Author(s)
A. M. Hallas, J. Gaudet, Nicholas Butch, M. Tachibana, R. S. Freitas, G. M. Lake, C. R. Wiebe, B. D. Gaulin
The ytterbium pyrochlore magnets, Yb 2B 2O 7 (B=Sn, Ti, Ge) are well described by S eff = 1/2 quantum spins with local XY anisotropy, decorating the cubic pyrochlore lattice and interacting via anisotropic exchange. Structurally, while only the non

Spin Jam Induced by Quantum Fluctuations in a Frustrated Magnet

September 15, 2015
Author(s)
Junjie Yang, Anjana Samarakoon, Sachith Dissanayake, Hiroaki Ueda, Israel Klich, Daniel M Pajerowski, Nicholas Butch, Qingzhen Huang, John R. Copley, Seung-Hun Lee
Since the discovery of spin glasses in dilute magnetic systems, their study has been largely focused on understanding randomness and defects as the driving mechanisms. However, it has been theoretically suggested that different mechanism. However, it has

Spectroscopic Determination of the Atomic f-Electron Symmetry Underlying Hidden Order in URu 2 Si 2

June 9, 2015
Author(s)
L. Andrew Wray, Jonathan Denlinger, Shih-Wen Huang, Haowei He, Nicholas Butch, M. Brian Maple, Zahid Hussain, Yi-De Chuang
The hidden order state of URu6d2^Si 2 has been a subject of intense speculation for more than 25 years, but there is still no clear consensus on what degrees of freedom are important for a low temperature physical model. Here, X-ray absorption spectroscopy