47 citations · 173 across the 14 of their papers we have counts for
15 papers
Discovery of Niobium Hydride Precipitates in Superconducting Qubits
Zuhawn Sung, Daniel Bafia, Arely Cano +6
We report the evidence of the formation of niobium hydride phase within niobium films on silicon substrates in superconducting qubits fabricated at Rigetti Computing. For this stud…
Magnetic Fluctuations in Niobium Pentoxide
Y. Krasnikova, A. A. Murthy, F. Crisa +10
Using a spin-polarized muon beam we were able to capture magnetic dynamics in an amorphous niobium pentoxide thin film. Muons are used to probe internal magnetic fields produced by…
Nuclear Magnetic Resonance Investigation of Superconducting and Normal State NbSn
Gan Zhai, William P. Halperin, Arneil P. Reyes +5
The superconductor NbSn has a high critical temperature and high critical field, widely used for high-field superconducting magnets. In this work we investigate its microscopic…
First Direct Observation of Nanometer size Hydride Precipitations on Superconducting Niobium
Zu Hawn Sung, Arely Cano, Akshay Murthy +5
Superconducting niobium serves as a key enabling material for superconducting radio frequency (SRF) technology as well as quantum computing devices. At room temperature, hydrogen c…
Evaluation of predictive correlation between flux expulsion and grain growth for superconducting radio frequency cavities
Zu Hawn Sung, Paulina Kulyavtsev, Martina Martinello +3
A series of experiments were carried out in an effort to develop a simple method for predicting magnetic flux expulsion behavior of high purity niobium used to fabricate supercondu…
High quality superconducting Nb co-planar resonators on sapphire substrate
S. Zhu, F. Crisa, M. Bal +10
We present measurements and simulations of superconducting Nb co-planar waveguide resonators on sapphire substrate down to millikelvin temperature range with different readout powe…
Stress-induced omega phase transition in Nb thin films for superconducting qubits
Jaeyel Lee, Zuhawn Sung, Akshay A. Murthy +2
We report the observation of omega phase formation in Nb thin films deposited by high-power impulse magnetron sputtering (HiPIMS) for superconducting qubits using transmission elec…
Contactless Excitation of Acoustic Resonance in Insulating Wafers
Gan Zhai, Yizhou Xin, Cameron J. Kopas +7
Contactless excitation and detection of high harmonic acoustic overtones in a thin insulator single crystal are described using radio frequency spectroscopy techniques. Single crys…
Key directions for research and development of superconducting radio frequency cavities
S. Belomestnykh, S. Posen, D. Bafia +53
Radio frequency superconductivity is a cornerstone technology for many future HEP particle accelerators and experiments from colliders to proton drivers for neutrino facilities to…
Discovery of Nb hydride precipitates in superconducting qubits
Jaeyel Lee, Zuhawn Sung, Akshay A. Murthy +3
We report the first evidence of the formation of niobium hydrides within niobium films on silicon substrates in superconducting qubits fabricated at Rigetti Computing. We combine c…
Grain-boundary structure and segregation in Nb3Sn coatings on Nb for high-performance superconducting radiofrequency cavity applications
Jaeyel Lee, Zugang Mao, Kai He +7
We report on atomic-scale analyses of grain boundary (GB) structures and segregation in Nb3Sn coatings on Nb, prepared by the vapor-diffusion process, for superconducting radiofreq…
Accelerating fields up to 49 MV/m in TESLA-shape superconducting RF niobium cavities via 75C vacuum bake
A. Grassellino, A. Romanenko, D. Bice +9
In this paper we present the discovery of a new surface treatment applied to superconducting radio frequency (SRF) niobium cavities, leading to unprecedented accelerating fields of…
Evidence from EXAFS for Different Ta/Ti Site Occupancy in High Critical Current Density NbSn Superconductor Wires
Steve M. Heald, Chiara Tarantini, Peter J. Lee +4
To meet critical current density, J, targets for the Future Circular Collider (FCC), the planned replacement for the Large Hadron Collider (LHC), the high field performance of…
Significant enhancement of compositional and superconducting homogeneity in Ti rather than Ta-doped Nb3Sn
C. Tarantini, Z. H. Sung, P. J. Lee +2
Nb3Sn wires are now very close to their final optimization but despite its classical nature, detailed understanding of the role of Ta and Ti doping in the A15 is not fully understo…
Evidence that the upper critical field of Nb3Sn is independent of whether it is cubic or tetragonal
Jian Zhou, Younjung Jo, Zu Hawn Sung +3
Although 2011 marks the 50th anniversary of Nb3Sn as the first high field superconductor, real understanding of its upper critical field behavior μ0Hc2 is incomplete. Here we show…