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Search Publications by: Jeffrey W Lynn (Fed)

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Displaying 226 - 250 of 289

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

Molecular Spin Excitations in the Orbitally Frustrated Spinel GeCo 2O d4^

August 2, 2011
Author(s)
K. Tomiyasu, Michael K. Crawford, D.T. Adroja, P. Manuel, A. Tominaga, S. Hara, H. Sato, T. Watanabe, S. I. Ikeda, Jeffrey W. Lynn, K. Iwasa, K Yamada
We describe powder and single-crystal inelastic neutron scattering experiments on a spinel-type antiferromagnet GeCo 2O 4 with orbital degrees of freedom, which is a candidate for a geometrically orbitally frustrated system. Several types of short-range

Antiferromagnetic Spin Excitations in Single Crystals of Nonsuperconducting Li 1-x FeAs

June 24, 2011
Author(s)
Meng Wang, X. C. Wang, D. L. Abernathy, L. W. Harriger, H. Q. Luo, Yang Zhao, Jeffrey W. Lynn, Q. Q. Liu, C. Q. Jin, Chen Fang, Jianping Hu, Pengcheng Dai
We use neutron scattering to determine spin excitations in single crystals of nonsuperconducting Li 1¿xFeAs throughout the Brillouin zone. Although angle resolved photoemission experiments and local density approximation calculations suggest poor Fermi

Dzyaloshinskii-Moriya Interaction and Spin Re-Orientation Transition in the Frustrated Kagome Lattice Antiferromagnet

June 9, 2011
Author(s)
K. Matan, B. M. Bartlett, Joel Helton, V. Sikolenko, S. Mat'as, K. Prokes, Ying Chen, Jeffrey W. Lynn, D. Grohol, T. J. Sato, M. Tokunaga, D. G. Nocera, Y. S. Lee
Magnetization, specific heat, and neutron scattering measurements were performed to study a magnetic transition in jarosite, a spin-5/2} kagome lattice antiferromagnet. When a magnetic field is applied perpendicular to the kagome plane, magnetizations in

Magnetic Field Effect on the Static Antiferromagnetic Order and Spin Excitations in Underdoped Iron Arsenide Superconductor BaFe 1.92 Ni 0.08 As 2

March 14, 2011
Author(s)
Miaoyin Wang, Huiqian Luo, Meng Wang, Song Xue Chi, Jose Rodriguez Rivera, Deepak Singh, Sung Chang, Jeffrey W. Lynn, Pengcheng Dai
We use neutron scattering to study the magnetic field effect on the static antiferromagnetic (AF) order and low-energy spin excitations in the underdoped iron arsenide superconductor BaFe 1.92Ni 0.08As 2. At zero field, superconductivity that occurs below

Soft Phonons and Structural Phase Transition in Superconducting Ba 0.59 K 0.41 BiO 3

March 3, 2011
Author(s)
Hye J. Kang, Y. S. Lee, Jeffrey W. Lynn, S. V. Shiryaev, S.N. Barilo
We have observed a softening of phonons and a structural phase transition in a superconducting Ba 0.6K 0.4BiO 3 (Tc = 31 K) single crystal using elastic and inelastic neutron scattering measurements. The soft phonon occurs for the [111] transverse acoustic

Nitrogen Contamination in Elastic Neutron Scattering

February 23, 2011
Author(s)
Song Xue Chi, Jeffrey W. Lynn, Ying Chen, William D. Ratcliff, Benjamin Ueland, Nicholas P. Butch, Shanta R. Saha, Kevin Kirshenbaum, Johnpierre Paglione
Nitrogen gas accidentally sealed in a sample container produces various spurious effects in elastic neutron scattering measurements. These effects are systematically investigated and the details of the spurious scattering are presented.