Superconducting Properties of the NbN and TiN alloy system.

dc.contributor.advisorRichardson, Christopher J.K.en_US
dc.contributor.authorSantos-Cotto, Abimaelen_US
dc.contributor.departmentMaterial Science and Engineeringen_US
dc.contributor.publisherDigital Repository at the University of Marylanden_US
dc.contributor.publisherUniversity of Maryland (College Park, Md.)en_US
dc.date.accessioned2020-02-06T06:34:23Z
dc.date.available2020-02-06T06:34:23Z
dc.date.issued2019en_US
dc.description.abstractThe field of quantum computation has advanced greatly in the recent years, with materials being tuned to address issues like qubit lifetime, and coherence time. Superconducting qubits based on Josephson Junctions are a promising approach for improved qubit design, yet they are made with polycrystalline and amorphous materials. Transition metal nitrides, like TiN and NbN, offer good chemical and mechanical properties as well as the possibility of a lattice matched junction, with AlN as the insulating layer. We have characterized MBE grown NbxTi1-xN films (with x = 0, 0.45, and 0.78) and a Nb2N film by XRD and AFM. This thesis will focus on the superconducting properties: critical temperature (Tc), superconducting transition width (ΔTc), and critical field (Hc). Two methods have been used: four-point probe DC measurements in an adiabatic demagnetization refrigerator (ADR) were used for Tc and ΔTc measurements, and a magnetic properties measurement system (MPMS) which employs a SQUID magnetometer was employed for Tc and Hc measurements. Values of Tc ranged from 4.2 K for TiN to 15.2 K for the x= 0.45 film, and 14.8 for x=0.78, while the Nb2N had Tc of 9.9 K, as found by DC measurements. These values agreed with those found by MPMS. The films’ critical fields were found to be ~69.6 Oe for the TiN film and ~250 Oe for x=0.78. These results start to demonstrate the trends of the superconducting properties of alloyed NbxTi1-xN superconductors.en_US
dc.identifierhttps://doi.org/10.13016/wxo4-q4b0
dc.identifier.urihttp://hdl.handle.net/1903/25526
dc.language.isoenen_US
dc.subject.pqcontrolledMaterials Scienceen_US
dc.subject.pquncontrolledCritical Fielden_US
dc.subject.pquncontrolledMPMSen_US
dc.subject.pquncontrolledNbNen_US
dc.subject.pquncontrolledsuperconductorsen_US
dc.subject.pquncontrolledTiNen_US
dc.subject.pquncontrolledTransition Temperatureen_US
dc.titleSuperconducting Properties of the NbN and TiN alloy system.en_US
dc.typeThesisen_US

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