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Physics

Condensed matter

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Displaying 551 - 575 of 1253

Spin Correlations of Quantum Spin Liquid and Quadrupole-Ordered States of Tb 2+x Ti 2-x O 7+y

January 7, 2019
Author(s)
Hiroaki Kadowaki, Mika Wakita, Bjorn Fak, Jacques Ollivier, Seiko Ohira-Kawamura, Kenji Nakajima, Jeffrey W. Lynn
Spin correlations of the frustrated pyrochlore oxide Tb 2+xTi 2-xO 7+y have been investigated by using inelastic neutron scattering on single crystalline samples (x = -0.007, 0.000, and 0.003), which have the putative quantum-spin-liquid (QSL) or electric

Electrical Detection of Singlet Fission in Single Crystal Tetracene Transistors

January 4, 2019
Author(s)
Hyuk-Jae Jang, Emily Bittle, Qin Zhang, Adam Biacchi, Curt A. Richter, David J. Gundlach
Here, we present the electrical detection of singlet fission in tetracene by using a field- effect transistor (FET). Singlet fission is a photo-induced spin-dependent process yielding two triplet excitons from the absorption of a single photon. , In this

Continuum of Quantum Fluctuations in a Three-Dimensional S = 1 Heisenberg Magnet

January 1, 2019
Author(s)
K. W. Plumb, Hitesh J. Changlani, A. Scheie, Shu Zhang, J. W. Krizan, Jose Rodriguez Rivera, Yiming Qiu, B. Winn, R. J. Cava, Collin L. Broholm
Spin liquids are a fundamentally new phase of matter that cannot be described by a broken symmetry and have no order parameter. While the quantum entanglement that characterizes a quantum spin liquid is not directly accessible to any current measurement

Hidden Hyperuniformity in Bottlebrush Polymer Melts

December 21, 2018
Author(s)
Alexandros Chremos, Jack F. Douglas
We show that the backbone chains of bottlebrush polymer melts exhibit a hidden hyperuniform packing over a wide temperature range above glass transition temperature. These findings open a venue for a practical design of hyperuniform polymeric materials for

Phonon Localization in Heat Conduction

December 21, 2018
Author(s)
M. N. Luckyanova, J. Mendoza, H. Lu, B. Song, S. Huang, J. Zhou, M. Li., Y. Dong, H. Zhou, J. Garlow, L. Wu, Brian Kirby, Alexander Grutter, Alex A. Puretzky, Y. Zhu, M. S. Dresselhaus, A. Gossard, G. Chen
We report localization-like behavior in phonon heat conduction observed both in measurement of the thermal conductivities of GaAs/AlAs superlattice (SL) thin films with interfacial disorder caused by ErAs nanodots randomly distributed at the interfaces

Spin Waves Across Three-Dimensional, Close-Packed Nanoparticles

December 21, 2018
Author(s)
Kathryn Krycka, James Jennings Rhyne, Samuel D Oberdick, Ahmed M. Abdelgawad, Julie A. Borchers, Yumi Ijiri, Sara A. Majetich, Jeffrey W. Lynn
Inelastic neutron scattering is utilized to measure the spin waves, or magnons, which arise from inter-particle coupling between 8.4 nm ferrite nanoparticles that are self-assembled into a close-packed lattice, yet physically separated by oleic acid

Identification of dopant site and its effect on electrochemical activity in Mn-doped Lithium Titanate

December 20, 2018
Author(s)
Harischchandra Singh, Mehmet Topsakal, Klaus Attenkofer, Tamar Wolf, Michal Leskes, Yandong Duan, Feng Wang, John Vinson, Deyu Lu, Anatoly Frenkel
We observed significant battery rate performance drop of nearly 20% in 1% Mn doped Lithium Titanate (LTO) compared to the pristine LTO. Using a combination of the X-ray absorption near edge structure experiment with theoretical modeling we demonstrated

Helical Magnetism in Sr-Doped CaMn 7 O 12 Films

December 19, 2018
Author(s)
Amanda Huon, Anuradha M. Vibhakar, Alexander Grutter, Julie Borchers, Steven Disseler, Yaohua Liu, Wei Tian, Fabio Orlandi, Pascal Manuel, Dmitry D. Khalyavin, Yogesh Sharma, Andreas Herklotz, Ho Nyung Lee, Michael R. Fitzsimmons, Roger D. Johnson, Steven J. May
Noncollinear magnetism can play an important role in multiferroic materials but is relatively understudied in oxide heterostructures compared to their bulk counterparts. Using magnetometry and neutron diffraction, we demonstrate the presence of helical

Comprehensive Inelastic Neutron Scattering Study of the Multiferroic Mn 1-x Co x WO 4

December 14, 2018
Author(s)
Jinchen Wang, R. S. Fishman, Yiming Qiu, J. A. Fernandez-Baca, Georg Ehlers, K.-C. Liang, Yaqi Wang, Bernd Lorenz, C. W. Chu, Feng Ye
Using high-resolution inelastic neutron scattering, we examine the spin dynamics of Mn 1-xCo xWO 4 in the collinear AF1, the ac-b spiral AF2, and the ac spiral AF5 phases. The spin wave excitations are well described by a Heisenberg model with competing

Anomalous Metamagnetism in the Low Carrier Density Kondo Lattice YbRh 3 Si 7

December 13, 2018
Author(s)
Binod K. Rai, S. Chikara, Xiaxin Ding, Iain W. H. Oswald, R. Schonemann, V. Loganathan, A. M. Hallas, H. B. Cao, Macy Stavinoha, T. Chen, Haoran Man, Scott Carr, John Singleton, Vivien Zapf, Katherine A. Benavides, Julia Y. Chan, Q. R. Zhang, D. Rhodes, Y. C. Chiu, Luis Balicas, A. A. Aczel, Qingzhen Huang, Jeffrey W. Lynn, J. Gaudet, D. A. Sokolov, H. C. Walker, D. T. Adroja, Pengcheng Dai, Andriy H. Nevidomskyy, C.-L. Huang, E. Morosan
We report complex metamagnetic transitions in single crystals of the new low carrier Kondo antiferromagnet YbRh 3Si 7. Electrical transport, magnetization, and specific heat measurements reveal antiferromagnetic order at Τ N = 7.5 K. Neutron diffraction

Ordered Magnetism in the Intrinsically Decorated j eff = 1/2 a-CoV 3 O 8

December 6, 2018
Author(s)
P. M. Sarte, A. M. Arevalo-Lopez, M. Songvilay, D. Le, T. Guidi, V. Garcia-Sakai, S. Mukhopadhyay, S. C. Capelli, William D. Ratcliff, K. H. Hong, G. M. McNally, E. Pachoud, J. P. Attfield, C. Stock
The zero field structural and dynamic properties of the mixed valence ternary oxide α-CoV 3O 8 has been investigated using a combination of diffraction, DC susceptibility and inelastic neutron scattering measurements. The low temperature magnetic

Highly mechanosensitive ion channels from graphene-embedded crown ethers

November 26, 2018
Author(s)
Alta Y. Fang, Kenneth Kroenlein, Demian Riccardi, Alexander Smolyanitsky
The ability to tune ionic permeation across nanoscale pores profoundly impacts diverse fields from nanofluidic computing to drug delivery. Here, we take advantage of complex formation between crown ethers and dissolved metal ions to demonstrate graphene

Magnetotransport in highly enriched 28Si for quantum information processing devices

November 25, 2018
Author(s)
Aruna N. Ramanayaka, Ke Tang, Joseph Hagmann, Hyun S. Kim, Curt A. Richter, Joshua M. Pomeroy
Elimination of unpaired nuclear spins can result in low error rates for quantum computation; therefore, isotopically enriched 28Si is regarded as an ideal environment for quantum information processing devices. Using mass selected ion beam deposition

Utilizing confocal laser scanning microscopy for rapid optical characterization of graphene

November 20, 2018
Author(s)
Vishal Panchal, Yanfei Yang, Guangjun Cheng, Jiuning Hu, Mattias Kruskopf, Chieh-I Liu, Albert Rigosi, Christos Melios, Angela R. Hight Walker, David B. Newell, Olga Kazakova, Randolph Elmquist
Confocal laser scanning microscopy (CLSM) is a non-destructive, highly-efficient optical characterization method for large-area analysis of graphene on different substrates, which can be applied in ambient air, does not require additional sample

Tuning the Magnetic Ground State of Ce 1-x Yb x RhIn 5 by Yb Valence Fluctuations

November 16, 2018
Author(s)
S. Jang, N. Pouse, T. Keiber, B. D. White, S. M. Disseler, Jeffrey W. Lynn, J. C. Collini, M. Janoschek, F. Bridges, M. B. Maple
We characterize the properties of Ce 1-xYb xRhIn 5 single crystals with 0 less than or equal to} x less than or equal to} 1 using measurements of powder x-ray diffraction (XRD), energy dispersive x-ray spectroscopy (EDS), electrical resistivity, magnetic

Dephasing of InAs quantum dot p-shell excitons using two-dimensional coherent spectroscopy

November 12, 2018
Author(s)
Galan Moody, Takeshi Suzuki, Rohan Singh, Marc Assman, Manfred Bayer, Arne Ludwig, Andreas Wieck, Steven T. Cundiff
The dephasing mechanisms of p-shell and s-shell excitons in an InAs self-assembled quantum dot ensemble are examined using two-dimensional coherent spectroscopy (2DCS). 2DCS provides a comprehensive picture of how the energy level structure of dots affects

In aqua electrochemistry probed by XPEEM: experimental setup, examples, and challenges

November 10, 2018
Author(s)
Slavomir Nemsak, Evgheni Strelcov, Hongxuan Guo, Brian Hoskins, Tomas Duchon, D Muller, Alexander Yulaev, Ivan Vlassiouk, Alexander Tselev, Andrei Kolmakov
Recent developments in environmental and liquid cells equipped with electron transparent graphene windows have enabled traditional surface science spectromicroscopy tools, such as XPS, PEEM, and SEM to be applied to study solid-liquid and liquid-gas
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