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Physics

Condensed matter

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Displaying 701 - 725 of 1261

Influence of polymer architecture on diffusion in polymers melts

August 2, 2017
Author(s)
Alexandros Chremos, Cheol Jeong, Jack F. Douglas
Recent simulations have indicated that the thermodynamic properties and the glassy dynamics of polymer melts are strongly influenced by average molecular shape, as quantified by the radius of gyration tensor of the polymer molecules, and that average

Viscosity Measurements of R32 and R410A to 350 MPa

August 1, 2017
Author(s)
Arno D. Laesecke, Scott Bair
Viscosity measurements were performed with a falling cylinder viscometer on difluoromethane (R32) and the refrigerant blend R410A (R32+R125 with 50 % by mass) at the temperatures 313.15 K, 348.15 K, and 393.15 K with pressures to 350 MPa. The measurement

Complex Magnetic Incommensurability and Electronic Charge Transfer through the Ferroelectric Transition in Multiferroic Co 3 TeO 6

July 25, 2017
Author(s)
Chi-Hung Lee, Chin-Wei Wang, Yang Zhao, Wen-Hsien Li, Jeffrey W. Lynn, A. Brooks Harris, Kirrily Rule, Hung-Duen Yang, Helmuth Berger
Polarized and unpolarized neutron diffractions have been carried out to investigate the nature of the magnetic structures and transitions in monoclinic Co 3TeO 6. As the temperature is lowered: below T M1 = 26 K long range order develops, which is fully

Nonreciprocal Magnons and Symmetry-Breaking in the Noncentrosymmetric Antiffomagnet

July 24, 2017
Author(s)
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

Successive Field-Induced Transitions in BiFeO 3 Around Room Temperature

July 21, 2017
Author(s)
Shiro Kawachi, Atsushi Miyake, Toshimitsu Ito, Sachith E. Dissanayake, Masaaki Matsuda, William D. Ratcliff, Yang Zhao, Shin Miyahara, Masashi Tokunaga
The Effects of high magnetic fields applied perpendicular to the spontaneous ferroelectric polarization on single crystals of BiFeO 3 were investigated through magnetization, magnetostriction, and neutron diffraction measurements. The magnetostriction

Assembly of Multi-flavored Two-Dimensional Colloidal Crystals

July 12, 2017
Author(s)
Nathan Mahynski, Hasan Zerze, Harold W. Hatch, Vincent K. Shen, Jeetain Mittal
We systematically investigate the assembly of binary multi-flavored colloidal mixtures in two dimensions. In these mixtures all pairwise interactions between species may be tuned independently. This introduces an additional degree of freedom over more

Complex Three-Dimensional Magnetic Ordering in Segmented Nanowire Arrays

July 12, 2017
Author(s)
Alexander J Grutter, Kathryn Krycka, Elena V. Tartakovskaya, Julie A. Borchers, K. Sai Madhukar Reddy, Eduardo Ortega, Arturo Ponce, Bethanie J. H. Stadler
The first comprehensive three-dimensional picture of magnetic ordering in high-density arrays of segmented FeGa/Cu nanowires is experimentally realized through the application of Polaris small angle neutron scattering. The competing energetics of dipolar

Higgs Amplitude Mode in a Two-Dimensional Quantum Antiferromagnet near the Quantum Critical Point0

July 4, 2017
Author(s)
Tao Hong, Masashige Matsumoto, Yiming Qiu, Wangchun Chen, Thomas R. Gentile, Shannon M. Watson, Firas F. Awwadi, Mark M. Turnbull, Sachith E. Dissanayake, Harish Agrawal, Rasmus Toft-Petersen, Bastian Klemke, Kris Coester, Kai P. Schmidt, David A Tennant
Spontaneous symmetry-breaking quantum phase transitions play an essential role in current condensed matter physics 1-3. The collective excitations in the broken-symmetry phase near the quantum critical point can be characterized by fluctuations of phase

Optical Radiation from Integer Quantum Hall States in Dirac Materials

June 30, 2017
Author(s)
Michael Gullans, Jacob M. Taylor, Mohammad Hafezi
Quantum Hall systems exhibit topologically protected edge states, which can have a macroscopic spatial extent. Such edge states provide a unique opportunity to study a quantum emitter whose size far exceeds the wavelength of emitted light. To better

Quantum Critical Behavior in the Asymptotic Limit of High Disorder in the Medium Entropy Alloy NiCoCr 0.8

June 29, 2017
Author(s)
Brian C. Sales, Ke Jin, Hongbin Bei, John Nichols, Matthew F. Chisholm, F. May, Nicholas Butch, Andrew D. Christianson, Michael A. McGuire
Concentrated solid solutions of transition metal atoms, such as NiCoCr, have extreme chemical disorder within a simple face-centered-cubic crystal structure. These alloys can be grown as large single crystals, and are closely related to the recently

Towards single atom devices for quantum information and metrology: weak localization in embedded phosphorus delta layers in silicon

June 29, 2017
Author(s)
Joseph A. Hagmann, Xiqiao Wang, Pradeep N. Namboodiri, Jonathan E. Wyrick, Roy E. Murray, Michael D. Stewart, Richard M. Silver, Curt A. Richter
The key building block for devices based on the deterministic placement of dopants in silicon is the formation of phosphorus dopant monolayers and the overgrowth of high quality crystalline Si. Lithographically defined dopant delta-layers can be formed

Analytic description of the impact of grain boundaries on Voc

June 26, 2017
Author(s)
Paul M. Haney, Benoit H. Gaury
The impact of grain boundaries on the performance of polycrsytalline photovoltaics remains an open question. We present a simplified description of dark grain boundary recombination current. The dark current takes the form of a diode equation, and the

High-Field Magnetization and Magnetic Phase Diagram of a-Cu 2 V 2 O 7

June 16, 2017
Author(s)
G. Gitgeatpong, M. Suewattana, Shiwei Zhang, A. Miyake, M. Tokunaga, P. Chanlert, N. Kurita, H. Tanaka, T. J. Sato, Yang Zhao, K. Matan
High-field magnetization of the spin-1/2 antiferromagnet α-Cu 2V 2O 7 was measured in pulsed magnetic fields of up to 56 T in order to study its magnetic phase diagram. When the field was applied along the easy axis (the a-axis), two distinct transitions

Quantum Critical Point in the Sc-Doped Itinerant Antiferromagnet TiAu

June 14, 2017
Author(s)
E. Svanidze, T. Besara, J. K. Wang, D. Geiger, L. Prochaska, J. M. Santiago, Jeffrey W. Lynn, S. Paschen, E. Morosan
We present the first experimental realization of a quantum critical point in an itinerant antiferromagnetic realization of a quantum critical point in an intinerant antiferromagnet composed of non-magnetic constituents, TiAu. By partially substituting Ti

First-Order Reversal Curves of the Magnetostructural Transition in FeTe

June 5, 2017
Author(s)
M. K. Frampton, J. Crocker, Dustin A. Gilbert, N. Curro, Kai Liu, J. A. Schneeloch, G. D. Gu, R. J. Zieve
We apply the first-order reversal curve (FORC) method, borrowed from studies of ferromagnetic materials, to the magneto-structural phase transition of Fe 1+yTe. FORC measurements reveal two features in the hysteretic phase transition, even in samples where

Comprehensive circuit model of auto-limiting superconductor devices and systems

May 31, 2017
Author(s)
Jordi Mateu, C Collado, A Hueltes, D Garcia-Pastor, R Perera, Nikhil M. Joshi, Xifeng Lu, Nate Orloff, Jim Booth
This paper presents a phenomenological equivalent circuit to model the phenomenon occurring when a section of superconducting transmission line transits from the superconductor to the normal state. This phenomenon allows the use of superconductors for the
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