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Search Publications by: Leland Harriger (Fed)

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Displaying 26 - 38 of 38

Quasiparticle-Continuum Level Repulsion in a Quantum Magnet

March 1, 2016
Author(s)
K. W. Plumb, Kyusung Hwang, Yiming Qiu, Leland Harriger, G. E. Granroth, Alexander I. Kolesnikov, G. J. Shu, F. C. Chou, Ch. Ruegg, Yong Baek Kim, Young-June Kim
When the energy eigenvalues of two coupled quantum states approach each other in a certain parameter space, their energy levels repel each other and level crossing is avoided. Such level repulsion, or avoided level crossing, is commonly used to describe

Magnetic Fluctuations Driven Insulator-to-Metal Transition in Ca(Ir 1-x Ru x )O 3

December 9, 2015
Author(s)
J. Gunasekera, Leland Harriger, A. Dahal, T. Heitmann, G. Vignale, D. K. Singh
Magnetic fluctuations in transition metal oxides are a subject of intensive research because of the key role they are expected to play in the transition from the Mott insulator to the unconventional metallic phase of these materials, and also as drivers of

Spin Waves and Spatially Anisotropic Exchange Interactions in the S = 2 Stripe Antiferromagnet Rb 0.8 Fe 1.5 S 2

July 13, 2015
Author(s)
Meng Wang, P. Valdivia, Ming Yi, J. X. Chen, W. L. Zhang, R. A. Ewings, T. G. Perring, Yang Zhao, Leland Harriger, Jeffrey W. Lynn, E. Bourret-Courchesne, Pengcheng Dai, D. H. Lee, D. X. Yao, R. J. Birgeneau
An inelastic neutron scattering study of the spin waves corresponding to the stripe antiferromagnetic order in insulating Rb 0.8 Fe 1.5 S 2 throughout the Brillouin zone is reported. The spin wave spectra are well described by a Heisenberg Hamiltonian with

Copper-Substituted Iron Telluride: A Phase Diagram

June 22, 2015
Author(s)
Patrick N. Valdivia, Min Gyu Kim, Thomas R. Forrest, Zhijun Xu, Meng Wang, Hui Wu, Leland Harriger, Edith D. Bourret-Courchesne, Robert J. Birgeneau
Metal site alloying of the iron chalcogenides is known to give rise to bulk insulating states with no known analogue in the iron arsenide phase diagrams. We have studied the structure, magnetic, and transport properties of copper substituted iron telluride

Quasilocal Critical Nature of Cooperative Paramagnetic Fluctuations in CaRuO 3 Metal

June 8, 2015
Author(s)
J. Gunasekera, Leland Harriger, T. Heitmann, A. Dahal, H. Knoll, D. K. Singh
We report new observation of cooperative paramagnetic fluctuations of Ru 4+ spins that coexist with the non-Fermi liquid state in CaRuO 3 perovskite below T22 K. Detailed electrical, magnetic and neutron scattering measurements reveal that the Ru R+ ions

High-Pressure Neutron Scattering of the Magnetoelastic Ni-Cr Prussian Blue Analog

March 3, 2015
Author(s)
Daniel M Pajerowski, S. E. Conklin, Juscelino Leao, Leland Harriger, D. Phelan
This paper summarizes 0 GPa to 0.6 GPa neutron diffraction measurements of a nickel hexacyanochromate coordination polymer (NiCrPB) that has the face-centered cubic, Prussian blue structure. Deuterated powders of NiCrPB contain approximately equal}100 nm

Low-Energy Phonons and Superconductivity in Sn 0.8In d0.2^Te

February 26, 2015
Author(s)
Zhijun Xu, J. A. Schneeloch, Ruidan Zhong, Jose Rodriguez Rivera, Leland Harriger, R. J. Birgeneau, Genda Gu, J. M. Tranquada, Guangyong Xu
We present neutron scattering measurements on low energy phonons from a superconducting (T c 2.7 K) Sn 0.8 In 0.2 Te Single crystal sample. The longitudinal and a transverse acoustic phonon modes have been mapped out around the (002) Bragg peak for

Effect of Pnictogen Height on Spin Waves in Iron Pnictides

May 28, 2014
Author(s)
Chenglin Zhang, Leland Harriger, Zhiping Yin, Weicheng Lv, Miaoyin Wang, Guotai Tan, Yu Song, D. L. Abernathy, Wei Tian, Takeshi Egami, Kristjan Haule, Gabriel Kotliar, Pengcheng Dai
We use inelastic neutron scattering to study spin waves in the antiferromagnetic ordered phase of iron pnictide NaFeAs throughout the Brillouin zone. Comparing with the well-studied AFe 2 As 2 (A = Ca,Sr,Ba) family, spin waves in NaFeAs have considerably

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

Strict Limit on In-Plane Ordered Magnetic Dipole Moment in URu 2 Si 2

April 17, 2014
Author(s)
Kathryn Aileen Ross, Leland Weldon Harriger, Z. Yamani, W. J. L. Buyers, J.D. Garrett, A.A. Menovsky, J.A. Mydosh, Collin L. Broholm
Neutron diffraction is used to examine the polarization of weak static antiferromagnetism in high quality single crystalline URu 2 Si 2 . As previously documented, elastic Bragg-like diffraction develops for temperature Τ HO = 17.5 K at q = (100) but not