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Physics

Condensed matter

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Displaying 601 - 625 of 1240

Amplitude Mode in the Planar Triangular Antiferromagnet Na 0.9 MnO 2

June 5, 2018
Author(s)
Rebecca L. Dally, Yang Zhao, Zhijun Xu, Robin Chisnell, M. B. Stone, Jeffrey W. Lynn, Leon Balents, Stephen D. Wilson
Amplitude modes that arise from continuous symmetry breaking in materials are of broad interest as condensed matter analogs of the Higgs boson in particle physics. These modes reflect an oscillation in the amplitude of a complex order parameter, yet they

Anomalous Supercurrent Modulation in Josephson Junctions With Ni-Based Barriers

May 15, 2018
Author(s)
Burm Baek, Michael L. Schneider, Matthew R. Pufall, William H. Rippard
We investigate the supercurrent transport characteristics of Ni-barrier Josephson junctions with various barrier multilayer structures. Our device fabrication and magneto-electrical measurement methods provide high enough statistics and rigor necessary for

Carrier Density Control of Magnetism and Berry Phases in Doped EuTiO 3

May 10, 2018
Author(s)
Kaveh Ahadi, Zhigang Gui, Zach Porter, Jeffrey W. Lynn, Zhijun Xu, Stephen D. Wilson, Anderson Janotti, Susanne Stemmer
In materials with broken time-reversal symmetry, the Berry curvature acts as a reciprocal space magnetic field on the conduction electrons and is significant contribution to the magnetotransport properties, including to the intrinsic anomalous Hall effect

Enhanced superconducting transition temperature in electroplated rhenium

April 30, 2018
Author(s)
David P. Pappas, Don David, Mustafa Bal, Ilke Arslan, Paul T. Blanchard, Ronald B. Goldfarb, Dustin A. Hite, Hsiang S. Ku, Russell E. Lake, Junling Long, Alexana Roshko, Lee D. Pappas, Britton L. Plourde, Jianguo Wen, Xian Wu, Corey Rae H. McRae
We show that electroplated Re films in multilayers with noble metals such as Cu, Au, and Pd have an enhanced superconducting critical temperature relative to previous methods of preparing Re. The dc resistance and magnetic susceptibility indicate a critical

Magnetic Ordering in a Frustrated Bow-Tie Lattice

April 28, 2018
Author(s)
Laura J. Vera Stimpson, Efrain E. Rodriquez, Craig Brown, Gavin B. G. Stenning, Marek Jura, Donna C. Arnold
We report a systematic elastic and inelastic powder neutron diffraction study of the geometrically frustrated material, Ca 2Mn 3O 8. Ca 2Mn 3O 8 exhibits a "bow-tie" like connectivity of Mn 4+ with Ca 2+ occupying octahedral sites between MnO 6 layers

Naturally Tuned Quantum Critical Point in the S = 1 Kagome YCa 3 (VO) 3 (BO 3 ) 4

April 26, 2018
Author(s)
Harlyn J. Silverstein, Ryan Sinclair, Arzoo Sharma, Yiming Qiu, Ivo Heinmaa, Alexander Leitmae, Christopher R. Wiebe, R. Stern, Haidong Zhou
Although S = 1/2 kagome systems have been intensely studied theoretically, and within the last decade been realized experimentally, much less is known about the S = 1 analogues. While the theoretical ground state is still under debate, it has been found

Flux-tunable heat sink for quantum electric circuits

April 20, 2018
Author(s)
Matti Partanen, K-Y Tan, S Masuda, Joonas Govenius, Russell Lake, Mate Jenei, Leif Gronberg, Juha Hassel, S Simbierowicz, Visa Vesterinen, J Tuorila, T Ala-Nissila, Mikko Mottonen
Superconducting microwave circuits show great potential for practical quantum technological applications such as quantum information processing. However, fast and on-demand initialization of the quantum degrees of freedom in these devices remains a

Determination of spin Hall effect and spin diffusion length of Pt from self-consistent fitting of damping enhancement and inverse spin-orbit torque measurements

March 22, 2018
Author(s)
Andy Berger, Eric R. Edwards, Hans T. Nembach, Olof Karis, Mathias Weiler, Thomas J. Silva
Understanding the evolution of spin-orbit torque (SOT) with increasing heavy-metal thickness in ferromagnet/normal metal (FM/NM) bilayers is critical for the development of magnetic memory based on SOT. However, several experiments have revealed an

Magnetic damping in sputtered Co2MnGe Heusler compounds with A2, B2 and L21 order: Experiment and Theory

March 19, 2018
Author(s)
Justin M. Shaw, Eric R. Edwards, Martin A. Schoen, Michael L. Schneider, Matthew R. Pufall, Thomas J. Silva, Hans T. Nembach, Erna Delczeg
We show that very low values of the magnetic damping parameter can be achieved in sputter deposited poly-crystalline films of Co2MnGe annealed at relatively low temperatures ranging from 240 oC to 400 oC. Damping values as low as 0.0014 are achieved with

Local spin-wave dispersion and damping in thin yttrium-iron-garnet films

March 13, 2018
Author(s)
Rouven Dreyer, Niklas Liebing, Eric R. Edwards, Georg Woltersdorf
Using ultrafast magneto-optic sampling microscopy, we investigate the spin-wave dispersion and spin-wave damping in yttrium-iron-garnet films. With the aid of the inhomogeneous magnetic field generated by coplanar waveguides spin-waves are excited at a

Imaging catalytic CO2 reduction on Cu2O (110) -- A First-Principles study

March 5, 2018
Author(s)
Eric L. Shirley, John T. Vinson, Liang Li, Maria K. Chan, Jeffry Greeley, Jeffrey R. Guest, Rui Zhang
Balancing global energy needs against increasing greenhouse gas emissions requires new methods for efficient CO2 reduction. While photoreduction of CO2 is promising, the rational design of photocatalysts hinges on precise characterization of the surface

Two-Dimensional Coherent Spectroscopy of Transition Metal Dichalcogenides

February 28, 2018
Author(s)
Galan Moody
Optical two-dimensional coherent spectroscopy is an extremely useful tool for examining the structure and dynamics of semiconductors. The appeal of the technique is in its ability to resolve both individual-emitter and ensemble-averaged properties of

Band Jahn-Teller Structural Phase Transition in Y 2 In

February 23, 2018
Author(s)
E. Svanidze, C. Georgen, Qingzhen Huang, J. M. Santiago, Jeffrey W. Lynn, E. Morosan
The number of paramagnetic materials that undergo a structural phase transition is rather small, which ca perhaps explain the limited understanding of the band Jahn-Teller mechanism responsible for the effect. Here we present a structural phase transition

Blade Coating Aligned, High-Performance, Semiconducting-Polymer Transistors

February 22, 2018
Author(s)
Lee J. Richter, Hyun W. Ro, Regis J. Kline, Daniel A. Fischer, Dean M. DeLongchamp, Lars Thomsen, Christopher McNeil, Dawei Wu, Maria Kaplan, Eliot H. Gann
Recent demonstration of mobilities in excess of 10 cm2V-1s-1 have energized research in solution deposition of polymers for thin film transistor applications. Due to the lamella motif of most soluble, semiconducting polymers, the local mobility is

Quantum Critical Singularities in Two-Dimensional Metallic XY Ferromagnets

February 20, 2018
Author(s)
Chandra M. Varma, W. J. Gannon, M. C. Aronson, Jose Rodriguez Rivera, Yiming Qiu
An important problem in contemporary physics concerns quantum-critical fluctuations in metals. A scaling function for the momentum, frequency, temperature and magnetic field dependence of the correlation function near a 2D-ferromagnetic quantum-critical

Quasistatic Antiferromagnetism in the Quantum Wells of SmTiO 3 /SrTiO 3 Heterostructures

February 20, 2018
Author(s)
Ryan F. Need, Patrick B. Marshall, Eric Kenney, Andreas Suter, Thomas Prokscha, Zaher Salman, Brian Kirby, Susanne Stemmer, Michael J. Graf, Stephen D. Wilson
The magnetic properties of high-density SrTiO 3 quantum wells embedded within the antiferromagnetic Mott insulator SmTiO 3 are explored via muon spin relaxation and polarized neutron reflectometry measurements. The one electron per wel acquired by the

Carbon Nanotube-Based Black Coatings

February 15, 2018
Author(s)
John H. Lehman, Christopher S. Yung, Nathan A. Tomlin, Davis R. Conklin, Michelle S. Stephens
It has been shown that coatings comprised of carbon nanotubes are very black; that is, characterized by low reflectance over a broad wavelength range from the visible to far infrared. Arguably there is no other material that is comparable. This is

Spontaneous Decay of a Soft Optical Phonon in the Relaxor Ferroelectric PbMg 1/3 Nb 2/3 O 3

February 13, 2018
Author(s)
C. Stock, Peter M. Gehring, R. A. Ewings, Guangyong Xu, Jiefang Li, Dwight Viehland, Haosu Luo
We report the spontaneous decay of a soft, optical phonon in a solid. Using neutron spectroscopy, we find that specific phonon lifetimes in the relaxor PbMg 1/3Nb 2/3O 3 are anomalously short within well-defined ranges of energy and momentum. This behavior

Doping-Induced Redistribution of Magnetic Spectral Weight in the Substituted Hexaborides Ce 1-x La x B 6 and Ce 1-x Nd x B 6

February 9, 2018
Author(s)
S. E. Nikitin, P. Y. Portnichenko, A. V. Dukhnenko, N.Yu. Shitsevalova, V. B. Filipov, Yiming Qiu, Jose Rodriguez Rivera, J. Ollivier, D. S. Inosov
We investigate the doping-induced changes in the electronic structure of CeB 6 on a series of substituted Ce 1-xR xB 6 and Ce 1-xNd xB 6 samples (R = La,Nd) using diffuse neutron scattering. We observe a redistribution of magnetic spectral weight across

High coherence plane breaking packaging for superconducting qubits

February 7, 2018
Author(s)
David P. Pappas, Xian Wu, Nicholas T. Bronn, Salvatore B. Olivadese, Vivekananda P. Adiga, Jerry M. Chow
Wedemonstrate a pogo pin package for a superconducting quantum processor specifically designed with a nontrivial layout topology (e.g., a center qubit that cannot be accessed from the sides of the chip). Two experiments on two nominally identical
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