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Physics

Condensed matter

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Displaying 751 - 775 of 1253

Ba 8 CoNb 6 O 24 : A Spin-1/2 Triangular-Lattice Heisenberg Antiferromagnet in the Two-Dimensional Limit

February 17, 2017
Author(s)
R. Rawl, L. Ge, H. Agrawal, Y. Kamiya, C. R. Dela Cruz, Nicholas Butch, X. F. Sun, M. Lee, E. S. Choi, J. Oitmaa, C. D. Batista, M. Mourigal, H. D. Zhou, J. Ma
The quasi-two-dimensional perovskite Ba 8CoNb 6O 24 comprises equilateral effective spin-1/2 Co 2+ triangular layers separated by six nonmagnetic Nb 5+ layers. Susceptibility, specific heat and neutron scattering measurements combined with high-temperature

Field Programmable Josephson Amplifier for non-reciprocal microwave signal processing

February 17, 2017
Author(s)
Florent Q. Lecocq, Leonardo Ranzani, Gabriel A. Peterson, Katarina Cicak, Raymond W. Simmonds, John D. Teufel, Jose A. Aumentado
We report on the design and implementation of a Field Programmable Josephson Amplifier (FPJA) - a compact and lossless superconducting circuit that can be programmed in-situ by a set of microwave drives to perform reciprocal and non-reciprocal frequency

Partial breakdown of quantum thermalization in a Hubbard-like model

February 17, 2017
Author(s)
James R. Garrison, Ryan Mishmash, Matthew P. Fisher
We study the possible breakdown of quantum thermalization in a model of itinerant electrons on a one-dimensional chain without disorder, with both spin and charge degrees of freedom. The eigenstates of this model exhibit peculiar properties in the

Ultrafast time-resolved x-ray absorption spectroscopy of ferrioxalate photolysis with a laser plasma x-ray source and microcalorimeter array

February 17, 2017
Author(s)
Galen C. O'Neil, Joel N. Ullom, Luis Miaja Avila, Young Il Joe, Joseph W. Fowler, Carl D. Reintsema, Daniel S. Swetz, Kevin L. Silverman, Daniel R. Schmidt, Bruce D. Ravel, Gene C. Hilton, William B. Doriese, Bradley K. Alpert, Ralph Jimenez
Using a table-top apparatus based upon a laser plasma x-ray source and an array of cryogenic microcalorimeter x-ray detectors, we have measured the transient x-ray absorption spectrum during the ferrioxalate photoreduction reaction. We observe the Fe K

Unified scaling law for flux pinning in practical superconductors: Part 3. Extrapolations from minimum datasets and applications of the extrapolative scaling expression

February 16, 2017
Author(s)
John (Jack) W. Ekin, Najib Cheggour, Loren F. Goodrich, Jolene D. Splett
The accuracy of present fitting equations to interpolate and extrapolate full Ic(B,T,ε) datasets is evaluated and compared with the extrapolative scaling expression (ESE) derived in Part 2. Accuracy is analyzed in terms of RMS error and fractional

Enabling photoemission electron microscopy in liquids via graphene-capped microchannel arrays

February 8, 2017
Author(s)
Hongxuan Guo, Evgheni Strelcov, Alexander Yulaev, Jian Wang, Narayana Appathurai, Stephen Urquhart, John Vinson, Subin Sahu, Michael P. Zwolak, Andrei Kolmakov
Photoelectron emission microscopy (PEEM) is a powerful tool to spectroscopically access dynamic surface processes at the nanoscale but is traditionally limited to ultra-high or moderate vacuum conditions. Here, we develop a novel graphene-capped

Ultrafast modulation of x-ray absorption by coherent phonon excitations

February 1, 2017
Author(s)
Eric L. Shirley, Jannick Weisshaupt, Michael Woerner, Marc J. Vrakking, Thomas Elsaesser, Andreas Borgschulte
X-ray absorption in solids promotes an electron from an atomic core level to the conduction band states, and near-edge spectra structure gives insight into local atomic geometry and chemical bonding effects. Based on a novel implementation of femtosecond x

Compact 2.2 K Cooling System for Superconducting Nanowire Single Photon Detectors

January 25, 2017
Author(s)
Vincent Y. Kotsubo, Ray Radebaugh, Sae Woo Nam, Joel N. Ullom, Brandon L. Wilson, Paul Hendershott, Micheal Bonczyski
We are developing a compact, low power, closed cycle cooling system for Superconducting Nanowire Single Photon Detectors. The base temperature of the present prototype, which uses a helium-4 Joule-Thomson stage, is 2.2 K with over 1.2 mW of cooling. This

Measurements of trapped-ion heating rates with exchangeable surfaces in close proximity

January 15, 2017
Author(s)
Dustin A. Hite, Kyle S. McKay, Shlomi Salman Kotler, Dietrich G. Leibfried, David J. Wineland, David P. Pappas
Electric-field noise from the surfaces of ion-trap electrodes couples to the ion’s charge causing heating of the ion’s motional modes. This heating limits the fidelity of quantum gates implemented in quantum information processing experiments. The exact

Advances in RRAM technology: identifying and mitigating roadblocks

January 13, 2017
Author(s)
Dmitry Veksler, Gennadi Bersuker
The filament-based RRAM has demonstrated superior scalability, endurance, low power operation, retention, and operating speed. A challenge navigating trade-offs between high density, low switching power, and stability can be addressed by capitalizing on

Tricritical Point of the f-Electron Antiferromagnet USb 2 Driven by High Magnetic Fields

January 12, 2017
Author(s)
Ryan L. Stillwell, I Lin NMN Liu, N. Harrison, M. Jaime, J. R. Jeffries, Nicholas Butch
In pulsed magnetic fields up to 65T and at temperatures below the Neel transition, our magnetization and magnetostriction measurements reveal a field-induced metamagnetic-like transition that is suggestive of an antiferromagnetic to polarized paramagnetic

Gapped Excitation in Dense Kondo Lattice CePtZn

January 10, 2017
Author(s)
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 T N = 1.75 K. Interesting, a Q-indpenedent characteristic and its persistence to

Extrapolative Scaling Expression: A Fitting Equation for Extrapolating Full Ic(B,T,e) Data Matrixes from Limited Data

January 4, 2017
Author(s)
John (Jack) W. Ekin, Najib Cheggour, Loren F. Goodrich, Jolene D. Splett, Bernardo Bordini, David Richter, Luca Bottura
Scaling analysis of several thousand Nb3Sn critical-current (Ic) measurements is used to derive the extrapolative scaling expression (ESE), a global fitting equation that can quickly and accurately extrapolate (or interpolate) limited datasets to obtain

Tailoring Exchange Couplings in Magnetic Topological Insulator/Antiferromagnet Heterostructures

January 1, 2017
Author(s)
Qing Lin He, Xufeng Kou, Alexander Grutter, Gen Yin, Lei Pan, Xiaoyu Che, Yuxiang Liu, Tianxiao Nie, Bin Zhang, Steven M.T. Disseler, Brian Kirby, William D. Ratcliff, Qiming Shao, Koichi Murata, Xiaodan Zhu, Guoqiang Yu, Yabin Fan, Mohammad Montazeri, Xiaodong Han, Julie Borchers, Kang L. Wang
Magnetic topological insulators such as Cr-doped (Bi,Sb) 2Te 3 provide a platform for the realization of versatile time-reversal symmetry-breaking physics. By constructing heterostructures with the unique Neel order in an antiferromagnetic CrSb and the

Stoner vs. Heisenberg: Ultrafast exchange reduction and magnon generation during laser-induced demagnetization

December 28, 2016
Author(s)
Thomas J. Silva, Hans T. Nembach, Justin M. Shaw, Emrah Turgut, Dmitriy Zusin, Dominik Legut, Karel Carva, Ronny Knut, Cong Chen, Zhensheng Tao, Stefan Mathias, Martin Aeschlimann, Peter Oppeneer, Henry Kapteyn, Margaret Murnane, Patrik Grychtol
Understanding how the electronic band structure of a ferromagnetic material is modified during laser-induced demagnetization on femtosecond timescales has been a long-standing question in condensed matter physics. Here, we use ultrafast high harmonics to

Magnetization Reversal of Three-Dimensional Nickel Anti-Sphere Arrays

December 23, 2016
Author(s)
Le Yu, Zhongying Yan, Han-Chang Yang, Xuzhao Chai, Bingqing Li, Sina Moeendarbari, Yaowu Hao, Di Zhang, Gang Feng, Ping Han, Dustin A. Gilbert, Kai Liu, Kristen S. Buchanan, Xuemei Cheng
Three-dimensional anti-sphere arrays (3DAAs) of Ni have been fabricated using electrochemical deposition into self-assembled polystyrene sphere templates, which offers the advantage of straightforward scalability. Using the first-order reversal curve (FORC

Identification of the Low-Energy Excitations in a Quantum Critical System

December 20, 2016
Author(s)
Tom Heitmann, Jagat Lamsal, Shannon M. Watson, Ross Erwin, Wangchun Chen, Yang Zhao, Wouter Montfrooij
We have identified low-energy magnetic excitations in a doped quantum critical system by means of polarized neutron scattering experiments. The presence of these excitations could explain why Cd(Fe 0.76Ru 0.24) 2Ge 2 displays dynamical scaling in the

Atomically precise device fabrication

December 7, 2016
Author(s)
Joseph A. Hagmann, Xiqiao Wang, Pradeep N. Namboodiri, Richard M. Silver, Curt A. Richter
An improved capacity to control matter at the atomic scale is central to the advancement of nanotechnology. The complementary metal-oxide-semiconductor (CMOS) devices that power existing computing technology, which continue to scale down in size as

Large Anomalous Hall Effect in a Half-Heusler Antiferromagnet

December 1, 2016
Author(s)
T. Suzuki, Robin Michael Daub Chisnell, A. Devarakonda, Y.-T. Liu, W. Feng, D. Xiao, Jeffrey W. Lynn, J. G. Checkelsky
The quantum mechanical (Berry) phase of the electronic wavefunction has profound effects on spin-dependent behavior in solids [2,2]. In the context of electronic transport, the Berry phase plays a critical role as a fundamental origin of the anomalous [3,4

Membrane-Based Environmental Cells for SEM in Liquids

December 1, 2016
Author(s)
Andrei A. Kolmakov
Environmental electron microscopy and Scanning Electron Microscopy (SEM) in liquids are among the most active research areas in modern electron microscopy and spectroscopy. Research interest in these techniques is broad as they are enabling the nanoscale

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

November 28, 2016
Author(s)
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

Oscillatory Non-Collinear Magnetism Induced by Interfacial Charge Transfer in Metallic Oxide Superlattices

November 22, 2016
Author(s)
Jason D. Hoffman, Brian Kirby, Jihwan Kwon, Gilberto Fabbris, John W. Freeland, Ivar Martin, Olle G. Heinonen, Paul Steadman, Hua Zhou, Christian M. Schleputz, Suzanne G. E. te Velthuis, Jian-Min Zuo, Anand Bhattacharya
Interfaces between correlated complex oxides are promising avenues to realize new forms of magnetism that arise as a result of charge transfer, proximity effects and locally broken symmetries. We report upon the discovery of a non-collinear magnetic
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