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Search Publications by: Jose A Rodriguez (Assoc)

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Displaying 51 - 75 of 102

Absence of Long-Wavelength Nematic Fluctuations in LiFeAs

December 1, 2016
Author(s)
Adrian Merritt, Jose Rodriguez Rivera, Yu Li, Weiyi Wang, Chenglin Zhang, Pengcheng Dai, Dmitry Reznik
We investigated long-wavelength nematic fluctuations in an Fe-based superconductor LiFeAs near q=(0.05,0,0) by measuring temperature-dependent renormalization of acoustic phonons through inelastic neutron scattering. We found that the phonons have

Recent Advancements of Wide-Angle Polarization Analysis with 3 He neutron Spin Filters

October 10, 2016
Author(s)
WangChun Chen, Thomas R. Gentile, Qiang NMN Ye, A. Kirchhoff, Shannon Watson, Jose A. Rodriguez, Yiming Qiu, Collin L. Broholm
Wide-angle polarization analysis with polarized 3He based neutron spin filters (NSFs) has recently been employed on the Multi-Axis Crystal Spectrometer (MACS) at the National Institute of Standards and Technology Center for Neutron Research (NCNR). Over

Modulated Magnetism and Anomalous Electronic Transport in Ce 3 Cu 4 As 4 O 2

August 29, 2016
Author(s)
Jiakui K. Wang, Shan Wu, Yiming Qiu, Jose Rodriguez Rivera, Qingzhen Huang, Collin L. Broholm, E. Morosan
The complex magnetism and transport properties of tetragonal Ce 3Cu 4As 4O 2 were examined through neutron scattering and physical properties measurements on polycrystalline samples. The lamellar structure consists of alternating layers of CeCu 4As 4 with

Modulated Magnetism and Anomalous Electronic Transport in Ce 3 Cu 4 As 4 O 2

August 29, 2016
Author(s)
Jiakui K. Wang, Shan Wu, Yiming Qiu, Jose Rodriguez Rivera, Qingzhen Huang, Collin L. Broholm, E. Morosan
The complex magnetism and transport properties of tetragonal Ce 3Cu 4As 4O 2 were examined through neutron scattering and physical properties measurements on polycrystalline samples. We find a lamellar structure consisting of alternating layers of CeCu 4As

Physical Realization of a Quantum Spin Liquid Based on a Complex Frustration Mechanism

July 25, 2016
Author(s)
Christian Balz, Bella Lake, Johannes Reuther, Hubertus Luetkens, Rico Schonemann, Thomas Herrmannsdorfer, Yogesh Singh, A.T.M. Nazmul Islam, Elisa M. Wheeler, Jose Rodriguez Rivera, Tatiana Guidi, G. Giovanna Simeoni, Chris Baines, Hanjo Ryll
Unlike conventional magnets where the magnetic moments are partially or completely static in the ground state, in a quantum spin liquid they remain in collective motion down to the lowest temperatures. The importance of this stat is that it is coherent and

Single to Multiquasiparticle Excitations in the Itinerant Helical Magnet CeRhIn 5

June 19, 2015
Author(s)
C. Stock, Jose Rodriguez Rivera, Karin Schmalzl, E. E. Rodriguez, A. Stunault, C. Petrovic
CeRhIn 5 is an itinerant magnet where the Ce 3+ spins order in a simple spiral phase caused by competing exchange interactions. We investigate the spin excitations and observe sharp spin- waves parameterized by a nearest neighbor exchange J RKKY =0.88 ±0

Disorder from Order Among Anisotropic Next-Nearest-Neighbor Ising Spin Chains in SrHo 2 O 4

February 26, 2015
Author(s)
J.-J. Wen, W. Tian, V. O. Garlea, S. M. Koohpayeh, T. M. McQueen, H.-F. Li, J.-Q. Yan, Jose Rodriguez Rivera, D. Vaknin, Collin L. Broholm
We describe why Ising spin chains with competing interactions in SrHo 2O 4 segregate into ordered and disordered ensembles at low temperatures (T). Using elastic neutron scattering, magnetization, and specific heat measurements, the two distinct spin

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 0.8In 0.2Te Single crystal sample. The longitudinal and a transverse acoustic phonon modes have been mapped out around the (002) Bragg peak for

Short-Range Correlations in the Magnetic Ground State of Na 4 Ir 3 O 8

December 12, 2014
Author(s)
Rebecca Dally, Tom Hogan, Alex Amato, Chris Baines, Jose Rodriguez Rivera, Michael J. Graf, Stephen D. Wilson
The magnetic ground state of the J eff = 1/2 hyper-Kagome lattice in Na 4Ir 3O 8 is explored via combined bulk magnetization, muon spin relaxation, and neutron scattering measurements. A short-range, frozen, state comprised of quasi-static moments develops

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