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Search Publications

NIST Authors in Bold

Displaying 3151 - 3175 of 3362

Effective Material Property Extraction Of a Metamaterial by Taking Boundary Effects into Account At TE/TM Polarized Incidence

September 22, 2011
Author(s)
Sung Kim, Christopher L. Holloway, James R. Baker-Jarvis, Edward Kuester, Kendra L. Kimberly
In this paper, we present the extraction for effective material parameters for a metamaterial from TE or TM waveguide measurements with generalized sheet transition conditions (GSTCs) used to provide electric and magnetic surface susceptibilities that

Graphene Production for Electrical Metrology

June 1, 2011
Author(s)
Randolph E. Elmquist, David B. Newell, George R. Jones, Felipe L. Marquez-Hernandez, Mariano A. Real, Tian T. Shen
Many material and electronic contributions must be favorable to produce devices with strong quantum Hall effect (QHE) plateaus that are suitable for precise resistance metrology. Even so, metrologically interesting QHE plateaus have been observed in

Inter-Laboratory Comparisons of NbTi Critical Current Measurements

June 22, 2009
Author(s)
Arno Godeke, D. Turrioni, T. Boutboul, Najib Cheggour, A. K. Ghosh, Loren F. Goodrich, M Meinesz, A. den Ouden
We report on a multi-institute comparison of critical current data, measured on a modern Large Hadron Collider (LHC) NbTi wire that has shown a standard deviation below 1% in critical current density spread in more than 1500 measurements. Inter-laboratory

Reversible axial-strain effect in Y-Ba-Cu-O coated conductors

November 7, 2005
Author(s)
Najib Cheggour, John (Jack) W. Ekin, C. L. H. Thieme, Y Y. Xie, V Selvamanickam, Ron Feenstra
The recently discovered reversible strain effect in Y-Ba-Cu-O (YBCO) coated conductors contrasts with the general understanding that the effect of strain on critical-current density J c in practical high-temperature superconductors is determined only by

Laser Cooling Transitions in Atomic Erbium

April 18, 2005
Author(s)
H Ban, M Jacka, James L. Hanssen, Joseph Reader, Jabez J. McClelland
We discuss laser cooling opportunities in atomic erbium, identifying five J rarr} J + 1 transitions from the 4f 126s 2 3H 6 ground state that are accessible to common visible and near-infrared continuous-wave tunable lasers. We present lifetime

Improved Microwave-discharge Source for uv Photoemission

April 1, 1976
Author(s)
Theodore V. Vorburger, B Waclawski, D Sandstrom
A microwave-discharge uv light source has been improved to yield significant photon fluxes at 26.9 and 40.81 eV. In order to optimize the 26.9-eV (NeII) and 40.81-eV (HeII) radiation, the discharge was operated at ~2.5 Pa (0.019 Torr) in an external

Room-temperature valence transition in a strain-tuned perovskite oxide

December 15, 2022
Author(s)
Vipul Chaturvedi, Supriya Ghosh, Dominique Gautreau, William M. Postiglione, John E. Dewey, Patrick Quarterman, Purnima P. Balakrishnan, Brian Kirby, Hua Zhou, Huikui Cheng, Amanda Huon, Timothy Charlton, Michael R. Fitzsimmons, Caroline Korostynski, Andrew Jacobson, Lucca Figari, Javier Garcia Barriocanal, T. Birol, K. A. Mkhoyan, Chris Leighton
Cobalt oxides have long been understood to display intriguing phenomena known as spin-state crossovers, where the cobalt ion spin changes vs. temperature, pressure, etc. A very different situation was recently uncovered in praseodymium-containing cobalt

Detection of molecular hydrogen in a neutron beam lifetime experiment

December 12, 2025
Author(s)
Jimmy Caylor, Ripan Biswas, Bret Crawford, Maynard Dewey, Nadia Fomin, Geoffrey Greene, Shannon Hoogerheide, Jose Hungria-Negron, Hans Mumm, Jeffrey Nico, Daniel Valete, Fred Wietfeldt, Joseph Zuchegno
One method of determining the free neutron lifetime involves the absolute counting of neutrons and trapped decay protons. In such experiments, a cold neutron beam traverses a segmented proton trap inside a superconducting solenoid while the neutron flux is

Grating magneto-optical traps with complicated level structures

October 25, 2023
Author(s)
Daniel Barker, Peter Elgee, Ananya Sitaram, Eric Norrgard, Nikolai Klimov, Gretchen K. Campbell, Stephen Eckel
We study the forces and optical pumping within grating magneto-optical traps (MOTs) operating on transitions with non-trivial level structure. In contrast to the standard six-beam MOT configuration, rate equation modelling predicts that the asymmetric

Iridate Li 8 IrO 6 : An Antiferromagnetic Insulator

November 15, 2021
Author(s)
Callista M. Skaggs, Peter E. Siegfried, Chang-Jong Kang, Craig Brown, Fu Chen, Lu Ma, Steven N. Ehrlich, Yan Xin, Mark Croft, Wenqian Xu, Saul H. Lapidus, Nirmal J. Ghimire, Xiaoyan Tan
A poltcrystalline iridate, Li 8IrO 6, material was prepared via heating Li 2O and IrO 2 starting materials in a sealed quartz tube at 650 °C for 48 hours. The structure was determined from Rietveld refinement of room temperature powder neutron diffraction

Excited Thomas-Efimov Levels in Ultracold Gases

October 12, 2021
Author(s)
M D. Lee, T Koehler, Paul S. Julienne
Since the early days of quantum physics, the complex behavior of three interacting particles has been the subject of numerous experimental and theoretical studies. In a recent Letter to Nature, Kraemer et al. [Nature (London) 440, 315 (2006)] report on

An Optical Investigation of the Heavy Fermion Normal State in Superconducting UTe 2

May 11, 2021
Author(s)
Sirak Mekonen, Chang-Jong Kang, Dipanjan Chaudhuri, David Barbalas, Sheng Ran, Gabriel Kotliar, Nicholas Butch, N. Armitage
The recently discovered superconductor, UTe 2, has attracted immense scientific interest due to the experimental observations that suggest odd-parity superconductivity. It is believed that the material becomes a heavy-fermion metal at low temperatures

Quantification of a PbCl x Shell on the Surface of PbS Nanocrystals

August 5, 2019
Author(s)
Samuel W. Winslow, Yun Liu, James W. Swan, William A. Tisdale
Differences between the properties of PbS nanocrystals prepared using a large excess of PbCl 2 and those prepared using other Pb sources have led to speculation that a thin PbCl x shell may be present on the surface of PbCl 2-derived PbS nanocrystals

Configurable error correction of code-division multiplexed TES detectors with a cryotron switch

June 10, 2019
Author(s)
Joel C. Weber, Joseph W. Fowler, Malcolm S. Durkin, Kelsey M. Morgan, John A. Mates, Douglas A. Bennett, William B. Doriese, Daniel R. Schmidt, Gene C. Hilton, Daniel S. Swetz, Joel N. Ullom
The development of a superconducting analog to the transistor with extremely low power dissipation will accelerate the proliferation of low-temperature circuitry operating in the milliKelvin regime. The thin-film, magnetically actuated cryotron switch is a
Displaying 3151 - 3175 of 3362
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