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Search Publications by: Leland Harriger (Fed)

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Displaying 1 - 25 of 37

Dynamics of Molecular Associates in Methanol/Water Mixtures

January 26, 2022
Yanqin Zhai, Peng Luo, Jackson Waller, Jeffrey L. Self, Leland Harriger, Y. Z., Antonio Faraone
The dynamics of molecular associates in methanol/water mixtures was investigated using quasielastic neutron scattering. By measuring the signal from four methanol/water samples differing only by their isotopic composition, the relative motion of the water

Spin Stripe Order in a Square Planar Trilayer Nickelate

June 18, 2019
Junjie Zhang, D. M. Pajerowski, A. S. Botana, Hong Zheng, Leland Harriger, Jose Rodriguez Rivera, J. Ruff, N. J. Schreiber, B. Wang, Yu-Sheng Chen, Wangchun Chen, M. R. Norman, S. Rosenkranz, J. F. Mitchell, D. Phelan
Trilayer nickelates, which exhibit a high degree of orbital polarization combined with an electron (d8.67) corresponding to overdoped cuprates, have been recognized as promising candidates for achieving high-Tc superconductivity. One such material

Comment on "Giant Electromechanical Coupling of Relaxor Ferroelectrics Controlled by Polar Nanoregion Vibrations"

March 22, 2019
Peter M. Gehring, Zhijun NMN Xu, C. Stock, Guangyong NMN Xu, Daniel E Parshall, Leland Weldon Harriger, C. A. Gehring, Xiaobing Li, Haosu Luo
Manley et al. (Science Advances, 16 September 2016, p.e1501814) report a splitting of a transverse acoustic phonon branch below Tc in the relaxor ferroelectric Pb[(Mg1/3Nb2/3)1-xTix]O3 with x=0.30 using neutron scattering methods. They argue that this

Low-Carrier Density and Fragile Magnetism in a Kondo Lattice System

February 12, 2019
Binod K. Rai, Iain W. H. Oswald, Wenjing Ban, C.-L. Huang, V. Loganathan, A. M. Hallas, M. N. Wilson, G. M. Luke, Leland Harriger, Qingzhen Huang, Y. Li, Sami Dzsaber, Julia Y. Chan, N. L. Wang, Silke Paschen, Jeffrey W. Lynn, Andriy H. Nevidomskyy, Pengcheng Dai, Q. Si, E. Morosan
Known low carrier Kondo systems evolve from metallic non-magnetic analogues, while a recent theoretical model for the dilute carrier Kondo limit predicts semimetallic behavior. Very few 4f low carrier Kondo systems have been reported, mostly based on Ce

Suppression of Antiferromagnetic Spin Fluctuations in Superconducting Cr 0.8 Ru 0.2

October 25, 2018
M. Ramazanoglu, B. G. Ueland, D. K. Pratt, Leland Harriger, Jeffrey W. Lynn, G. Ehlers, G. E. Granroth, S. L. Bud'Ko, P. C. Canfield, D. Schlagel, A. I. Goldman, T. A. Lograsso, R. J. McQueeney
Although the precise mechanism is under, unconventional superconductivity (SC) is linked to the pairing of electrons by itinerant antiferromagnetic (AFM) spin fluctuations. Thus, unconventional SC often develops in magnetic metals on the cusp of static AFM

Spin Waves in Detwinned BaFe 2 As 2

August 8, 2018
Xingye Lu, Daniel D. Scherer, David W. Tam, Wenliang Zhang, Rui Zhang, Huiqian Luo, Leland Harriger, H. C. Walker, D.T. Adroja, Brian M. Andersen, Pengcheng Dai

Correspondence: Phantom Phonon Localization in Relaxors

December 5, 2017
Peter M. Gehring, Daniel E Parshall, Leland Weldon Harriger, Christopher Stock, Guangyong Xu, Xiaobing Li, Haosu Luo
Manley et al. (Ref. [1]) report the observation of an unexpected, weak, phonon mode located in energy between that of the transverse acoustic (TA) and soft transverse optic (TO) modes in the relaxor ferroelectric Pb[(Mg0.33Nb0.67)1-xTix]O3 (PMN-xPT) with

Local Breaking of Fourfold Rotational Symmetry by Short-Range Magnetic Order in Heavily Overdoped Ba(Fe 1-x Cu x ) 2 As 2

October 11, 2017
Weiyi Wang, Yu Song, Ding Hu, Yu Li, Rui Zhang, Leland Harriger, Wei Tian, Huibo Cao, Pengcheng Dai
We investigate Cu-doped Ba(Fe1-xCux)2As2 with transport, magnetic susceptibility, and elastic neutron scattering measurements. In the heavily Cu-doped regime where long-range stripe-type antiferromagnetic order in BaFe2As2 is suppressed, Ba(Fe1-xCux)2As2

Reentrant Phase Diagram of Yb 2 Ti 2 O 7 in a [111] Magnetic Field

September 22, 2017
A. Scheie, J. Kindervater, S. Saubert, C. Duvinage, C. Pfleiderer, H. J. Changlani, S. Zhang, Leland Harriger, K. Arpino, S. M. Koohpayeh, Collin L. Broholm
We present a phase diagram of rare-earth pyrochlore Yb2Ti2O7 in a (111) magnetic field. Using heat capacity, magnetization, and neutron scattering data, we show an unusual field-dependence of a first-order phase boundary, wherein a small applied field

Nonreciprocal Magnons and Symmetry-Breaking in the Noncentrosymmetric Antiffomagnet

July 24, 2017
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

Origin of Long Lifetime of Band-Edge Charge Carriers in organic-Inorganic Lead Iodide Perovskites

July 17, 2017
Tianran Chen, Wei-Liang Chen, Benjamin J. Foley, Jooseop Lee, Jacob P. C. Ruff, J. Y. Peter Ko, Craig Brown, Leland Harriger, Depei Zhang, Changwon Park, Mina Yoon, Yu-Ming Chang, Joshua J. Choi, Seung-Hun Lee
Long carrier lifetime is what makes hybrid organic-inorganic perovskites (HOIPs) high performance photovoltaic materials. The microscopic mechanism behind the unusually long carrier lifetime of greater than equal to} 1 υs is not well understood. Here we

Spin Excitations and the Fermi Surface of Superconducting FeS

March 10, 2017
Haoran Man, Jiangang Guo, Rui Zhang, Rico U. Schonemann, Zhiping Yin, Mingxuan Fu, Matthew B. Stone, Qingzhen Huang, Yu Song, Weiyi Wang, David J. Singh, Felix Lochner, Tillman Hickel, Ilya Eremin, Leland Harriger, Jeffrey W. Lynn, Collin L. Broholm, Luis Balicas, Qimiao Si, Pengcheng Dai

Gapped Excitation in Dense Kondo Lattice CePtZn

January 10, 2017
Leland Weldon Harriger, Steven M.T. Disseler, J. Gunasekera, Jose A. Rodriguez, J. Pixley, P. Manfrinetti, S. K. Dhar, D. K. Singh
We report on neutron υSR scattering studies of dense Kondo lattice CePtZn. The system develops long range incommensurate magnetic order as the temperature is reduced below TN = 1.75 K. Interesting, a Q-indpenedent characteristic and its persistence to high

Intermediate Regime between Metal and Superconductor Below T = 100 K in NiSi

November 28, 2016
Ashutosh Dahal, Jagath Gunasekera, Leland Harriger, S. H. Lee, Y. S. Hor, David J. Singh, Deepak K. Singh
Magnetic response of a metal to an external magnetic field is termed as paramagnetic or diamagnetic, depending on the parallel or antiparallel alignment of electron's moment to the applied field, respectively.1-3 It remains independent of temperature of

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

November 7, 2016
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 URu2-xFexFexSi2 as a function of Fe concentration. The magnetic excitation spectra change significantly between x=0.05 and x=0.10

Entropy-Driven Structural Transition and Kinetic Trapping in Formamidinium Lead Iodide Perovskite

October 21, 2016
Tianran Chen, Benjamin J. Foley, Changwon Park, Craig Brown, Leland Harriger, Jooseop Lee, Jacob Ruff, Mina Yoon, Joshua J. Choi, Seugn-Hun Lee
A challenge for hybrid perovskite solar cells is device instability, which calls for understanding of the perovskite structural stability and phase transitions. Here, using neutron diffraction and ab-initio calculations on HC(NH2)2PbI3, we show that the

Electronic Nature of the Lock-in Magnetic Transition in CeXAl 4 Si 2

April 25, 2016
J. Gunasekera, Leland Harriger, A. Dahal, A. Maurya, T.W. Heitmann, Steven M.T. Disseler, A. Thamizhavel, S. Dhar, D. J. Singh, D. K. Singh
We have investigated the underlying magnetism in newly discovered single crystal Kondo lattices CeXAl4Si2, where X = Rh, Ir. We show that the compound undergoes an incommensurate-to- commensurate magnetic transition at Tc = 9.19 K (10.75 K in Ir). The spin

Quasiparticle-Continuum Level Repulsion in a Quantum Magnet

March 1, 2016
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