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Search Publications by: Jeffrey W Lynn (Assoc)

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Displaying 101 - 125 of 159

Chemical Pressure Tuning of URu 2 Si 2 via Isoelectronic Substitution of Ru with Fe

February 26, 2015
Author(s)
Pinaki Das, N. Kanchanavatee, Joel Helton, K. Huang, R. E. Baumbach, E. D. Bauer, B. D. White, V. W. Burnett, M. B. Maple, Jeffrey W. Lynn, M. Janoschek
We have used specific heat and neutron diffraction measurements on single crystals of UR 2-xFe xSi 2 for Fe concentrations X less than or equal to} 0.7 to establish that chemical substitution of Ru with Fe acts as "chemical pressure" P ch as previously

Neutron-Scattering Measurements of Spin Excitations in LaFeAsO and Ba(Fe 0.953 Co 0.047 ) 2 As 2 : Evidence for a Sharp Enhancement of Spin Fluctuations by Nematic Order

February 4, 2015
Author(s)
Qiang Zhang, Rafael M. Fernandes, Jagat Lamsal, Jiaqiang Yan, Songxue Chi, Gregory S. Tucker, Daniel K. Pratt, Jeffrey W. Lynn, R. W. McCallum, P. C. Canfield, Thomas A. Lograsso, Alan Goldman, David Vaknin, Robert J. McQueeney
Inelastic neutron scattering was employed to investigate the impact of electronic nematic order on the magnetic spectra of LaFeAsO and Ba(Fe 0.9536Cod0.047) 2As 2. These materials are ideal to study the paramagnetic-nematic state, since the nematic order

Symmetry and Correlations Underlying Hidden Order in URu 2 Si 2

January 26, 2015
Author(s)
Nicholas P. Butch, Michael E. Manley, Jason R. Jeffries, Marc Janoschek, Kevin Huang, M. Brian Maple, Ayman H. Said, Bogdan M. Leu, Jeffrey W. Lynn
The organization of correlated electrons in the Hidden Order (HO) phase of intermetallic URu 2Si 2 is a longstanding mystery. In this work, we study the symmetry by mapping the lattice and magnetic excitations via inelastic neutron and x-ray scattering

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

Quantum Critical Fluctuations in the Heavy Fermion compound Ce(Ni^s0.935^Pd 0.065 ) 2 Ge 2

December 3, 2014
Author(s)
C. H. Wang, L. Poudel, A. E. Taylor, J .M. Lawrence, A. D. Christianson, Sung Chang, Jose Rodriguez Rivera, Jeffrey W. Lynn, A. A. Podlesnyak, G. Ehlers, R. E. Baumbach, E. D. Bauer, K. Gofryk, F. Ronning, K. J. McClellan, J. D. Thompson
Inelastic neutron scattering experiments were performed on a single crystal of the heavy Fermion compound Ce(Ni 0.935Pd 0.065) 2Ge 2 in order to study the spin fluctuations near an antiferromagnetic (AF) quantum critical point (QCP). We find that the

Origin of the Charge Gap in LaMnPO

November 18, 2014
Author(s)
D. E. McNally, J. W. Simonson, K. W. Post, Z. P. Yin, M. Pezzoli, G. J. Smith, V. Leyva, C. Marques, L. DeBeer-Schmitt, A. I. Kolesnikov, Yang Zhao, Jeffrey W. Lynn, D. N. Basov, G. Kotliar, M. C. Aronson
We present inelastic neutron scattering and magnetization measurements of the antiferromagnetic insulator LaMnPO that are well described by a Heisenberg spin model. These measurements are consistent with the presence of two-dimensional magnetic

Neutron Scattering Studies of the Ferroelectric Distortion and Spin Dynamics in the Type-1 Multiferroic Perovskite Sr 0.56 Ba 0.44 MnO 3

October 9, 2014
Author(s)
Daniel K. Pratt, Jeffrey W. Lynn, James Mais, Omar Chmaissem, Dennis E. Brown, Stanislaw Kolesnik, Bogdan Dabrowski
The magnetic order, spin dynamics, and crystal structure of the multiferroic Sr 0.56Ba 0.44MnO 3 have been investigated using neutron and x-ray scattering. Ferroelectricity develops at T c=305 K with a polarization of 4.2 υC/cm 2 associated with the

Neutron, Electron, and X-ray Scattering Investigation of Cr 1-x V x Near Quantum Criticality

July 29, 2014
Author(s)
D. A. Sokolov, M. C. Aronson, L. Wu, Y. Zhu, C. Nelson, J. F. Mansfield, K. Sun, Ross Erwin, Jeffrey W. Lynn, M. Lumsden, S. E. Nagler
The weakness of electron-electron correlations in the itinerant antiferromagnet Cr doped with V has long been considered the reason that neither new collective electronic states or even non Fermi liquid behaviour are observed when antiferromagnetism in Cr

Fragile Antiferromagnetism in the Heavy-Fermion Compound YbBiPt

May 8, 2014
Author(s)
B. G. Ueland, A. Kreyssig, K. Prokes, Jeffrey W. Lynn, Leland Harriger, D.K. Pratt, D.K. Singh, T.W. Heitmann, S. Sauerbrei, S.M. Saunders, E. D. Mun, S. L. Bud'Ko, R.J. McQueeney, P. C. Canfield, A. I. Goldman
We report results from neutron scattering experiments on single crystals of YbBiPt that demonstrate antiferromagnetic order characterized by a propagation vector τAFM = (1/2,1/2,1/2}), and ordered moments that align along the [1 1 1] direction of the cubic

Phonon Localization Drives Polar Nanoregions in a Relaxor Ferroelectric

April 10, 2014
Author(s)
M. E. Manley, Jeffrey W. Lynn, D. L. Abernathy, E. D. Specht, O. Delaire, A. R. Bishop, R. Sahul, J. D. Budai
Relaxor Ferroelectrics 1, which are utilized as actuators and sensors 2-4, exemplify a class of poorly understood functional materials where an interplay between disorder and phase instability results in nanostructure. Foremost, there is no definitive

Magnetic Neutron Scattering

October 2, 2012
Author(s)
Jeffrey W. Lynn
Neutron scattering is a powerful tool to investigate the magnetic structures and spin dynamics of materials. In this tutorial we provide examples of the application of magnetic neutron diffraction using polycrystalline materials, single crystals, thin

Multiple Magnetic Structures of Correlated Ce-ions in Intermetallic CeAu 2 Ge 2

August 13, 2012
Author(s)
Deepak Singh, A. Thamizhavel, Jeffrey W. Lynn, S. K. Dhar, T. Hermann
Neutron diffraction measurements on a high quality single crystal of CeAu 2Ge 2 reveal two new magnetic structures that coexist with commensurate long range antiferromagnetic order below the Neel temperature T N {approximately equal} 14 K. The new magnetic

Magnetic Phase Diagram of Magnetoelectric LiMnPO 4

June 14, 2012
Author(s)
Rasmus Toft-Petersen, Niels H. Andersen, Haifeng Li, Jiying Li, Wei Tian, Sergey L. Bud'ko, Thomas B. S. Jensen, Christof Niedermayer, Mark Laver, Oksana Zaharko, Jeffrey W. Lynn, David Vaknin
The nature of the spin-flop (SF) transition in the magnetoelectric quasi-2D Heisenberg system LiMnPO 4 is studied in fields applied along the a axis. A refinement of the magnetic structure using neutron diffraction data in the SF phase reveals that the

Coexistence and Competition of the Short-Range Incommensurate Antiferromagnetic Order with Superconductivity in BaFe 2-x Ni x As 2

June 12, 2012
Author(s)
Huiqian Luo, Rui Zhang, Mark Laver, Zahra Yamani, Meng Wang, Xingye Lu, Miaoyin Wang, Yanchao Chen, Shiliang Li, Sung Chang, Jeffrey W. Lynn, Pengcheng Dai
Superconductivity in the iron pnictide develops near antiferromagnetism, and the antiferromagnetic (Af) phase appears to overlap with the superconducting phase in some materials such as BaFe 2-x(Co,NI) xAs 2. Here we use neutron scattering to demonstrate

Paramagnetic Spin Correlations in Colossal Magnetoresistive La 0.7 Ca 0.3 MnO 3

April 2, 2012
Author(s)
Joel Helton, Matthew B. Stone, Dmitry A. Shulyatev, Yakov M. Mukovskii, Jeffrey W. Lynn
Neutron spectroscopy measurements reveal dynamic spin correlations throughout the Brillouin zone in the colossal magnetoresistive system La 0.7Ca 0.3MnO 3 at 265 K ({approx}1.03T c). The long-wavelength behavior is consistent with spin diffusion, yet an

Interplay Between the Magnetic and Electric Degrees of Freedom in Multiferroic Co 3 TeO 6

March 28, 2012
Author(s)
Wen-Hsien Li, Chin-Wei Wang, Daniel Hsu, Chi-Hung Lee, Chun-Ming Wu, Chih-Chieh Chou, Hung-Duen Yang, Yang Zhao, Sung Chang, Jeffrey W. Lynn, Helmuth Berger
Neutron diffraction, magnetic susceptibility, specific heat, and dielectric constant measurements of single crystal Co 3TeO 6 have been measured to study the interplay between the ferroelectricy and magnetic order. Long range incommensurate magnetic order

Structural Collapse and Superconductivity in Rare-Earth-Doped CaFe 2 As 2

January 13, 2012
Author(s)
S. R. Saha, N. P. Butch, T. Drye, J. Magill, S. Ziemak, K. Kirshenbaum, P. Y. Zavalij, Jeffrey W. Lynn, J. Paglione
The interplay between structural, magnetic and superconducting properties in the newly discovered iron-based superconducting compounds has been a central theme in attempts to elucidate the nature of Cooper pairing in this new family of high-temperature

Evolution of the Commensurate and Incommensurate Magnetic phases of the S{/I= {3/2} Kagome Staircase Co 3 V 2 O 8 in a Applied Field

December 8, 2011
Author(s)
Joel Helton, Georgii L. Bychkov, Sergei N. Barilo, Nyrissa Rogado, Robert J. Cava, Jeffrey W. Lynn
Single crystal neutron diffraction studies have been performed on the S = {3/2} kagome staircase compound Co 3V 2O 8 with a magnetic field applied along the magnetization easy-axis (H || a). Previous zero field measurements [Y. Chen, et al., Phys. Rev. B

Quantum Spin Fluctuations in the Spin Liquid State of Tb 2 Ti 2 O^d7&

December 7, 2011
Author(s)
Hiroshi Takatsu, Hiroaki Kadowaki, Taku J. Sato, Yohiikazu Tabata, Jeffrey W. Lynn, Teruo Yamazaki, Kazuyuki Matsuhira
Neutron scattering experiments on a polycrystalline sample of the frustrated pyrochlore magnet Tb 2Ti 2O 7, which does not show any magnetic order down to 50 mK, have revealed that it shows condensation behavior below 0.4 K from a thermally fluctuationg

Common Origin of the Two Types of Magnetic Fluctuations in Iron Chalcogenides

December 5, 2011
Author(s)
Songxue Chi, Jose Rodriguez Rivera, Jeffrey W. Lynn, Chenglin Zhang, D. Phelan, Deepak Singh, Rick L. Paul, Pengcheng Dai
We use inelastic neutron scattering to study the low energy spin excitations in moderately doped non-superconducting Fe 1.01Te 0.72Se 0.28. The spin excitations in this system contain components near (0.5,0,0) and (0.5, 0.5,0) in a-b plane reciprocal

Response of Acoustic Phonons to Charge and Orbital order in the 50% Doped Bilayer Manganite LaSr 2 Mn 2 O 7 .

November 9, 2011
Author(s)
F. Weber, S. Rosenkranz, J.-P. Castellan, R. Osborn, H. Zheng, J. F. Mitchell, Y. Chen, Song Xue Chi, Jeffrey W. Lynn, D. Reznik
We report an inelastic neutron scattering study of acoustic phonons in the charge and orbitally ordered bilayer manganite LaSr 2. For excitation energies less than 15 meV, we observe an abrupt increase (decrease) of the phonon energies (linewidths) of a

Field-induced Quantum Fluctuations in the Heavy Fermion Superconductor CeCu 2 Ge 2

October 13, 2011
Author(s)
Deepak Singh, A. Thamizhavel, Jeffrey W. Lynn, S. K. Dhar, Jose A. Rodriguez, Tobias K Herman
Quantum-mechanical fluctuations in strongly correlated electron systems cause unconventional phenomena such as non-Fermi liquid behavior, and arguably high temperature superconductivity. Here we report the discovery of a field-tuned quantum critical

Magnetic Field Tuning of Antiferromagnetic Yb 3 Pt 4

October 11, 2011
Author(s)
L. S. Wu, Y. Janssen, C. Marques, M. C. Bennett, M. S. Kim, K. Park, Songxue Chi, Jeffrey W. Lynn, G. Lorusso, G. Biasiol, M.C. Aronson
We present measurements of the specific heat, magnetization, magnetocaloric effect and magnetic neutron diffraction carried out on single cyrstals of antiferromagnetic Yb 3Pt 4, where highly localized Yb moments order at T N = 2.4 K in zero field. The
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