Disorder-driven transport in ZrN thin films grown by ion-beam-assisted sputtering
Abstract
We investigate the structural and electronic transport properties of zirconium nitride (ZrN) thin films grown by dc ion-beam assisted sputtering (IBAS) as a function of nitrogen partial pressure, sputtering power and deposition temperature. Variation of growth conditions enables controlled tuning from disordered metallic and superconducting behavior to insulating transport. Increasing nitrogen flow drives an increase in sheet resistance, suppression of superconducting transition temperature, and non-metallic conduction. XRD shows no measurable change in long range crystallinity or order. In the insulating regime, low-temperature transport is well described by 3D Mott variable-range hopping (VRH), with the characteristic temperature T0 increasing monotonically with sheet resistance over four orders of magnitude. Despite this strong correlation between T0 and disorder, Tc exhibits no systematic dependence on T0, indicating a decoupling between localization physics and the superconducting energy scale. Magnetotransport measurements are not well described by the standard BCS model nor the dirty type-II Werthamer-Helfand-Hohenberg model. The phase boundary is instead captured by a free-exponent power law, μ0 Hc2(T) = μ0 Hc2(0)[1 − (T/Tc)n] with n ≈ 3.47, and extrapolates to μ0 Hc2(0) ≈ 6.4 T. The films have an extracted coherence length of 7 nm. These results establish IBAS-grown ZrN as a broadly tunable platform for investigating disorder-driven transport and the crossover between metallic conduction, electronic localization, and superconductivity.
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BibTeX
@misc{dipreta2026disorderdriven,
title = {{Disorder-driven transport in ZrN thin films grown by ion-beam-assisted sputtering}},
author = {Maximo DiPreta and Samuel Jiang and Serhii Kruhlov and Yi Li and Valentine Novosad and Tomas Polakovic},
howpublished = {arXiv},
year = {2026},
month = sep,
doi = {10.48550/arxiv.2609.13568},
eprint = {2609.13568},
archivePrefix = {arXiv},
url = {https://arxiv.org/abs/2609.13568},
}
RIS
TY - UNPB
TI - Disorder-driven transport in ZrN thin films grown by ion-beam-assisted sputtering
AU - Maximo DiPreta
AU - Samuel Jiang
AU - Serhii Kruhlov
AU - Yi Li
AU - Valentine Novosad
AU - Tomas Polakovic
PY - 2026
DA - 2026/09/11
PB - arXiv
DO - 10.48550/arxiv.2609.13568
UR - https://arxiv.org/abs/2609.13568
AB - We investigate the structural and electronic transport properties of zirconium nitride (ZrN) thin films grown by dc ion-beam assisted sputtering (IBAS) as a function of nitrogen partial pressure, sputtering power and deposition temperature. Variation of growth conditions enables controlled tuning from disordered metallic and superconducting behavior to insulating transport. Increasing nitrogen flow drives an increase in sheet resistance, suppression of superconducting transition temperature, and non-metallic conduction. XRD shows no measurable change in long range crystallinity or order. In the insulating regime, low-temperature transport is well described by 3D Mott variable-range hopping (VRH), with the characteristic temperature T_0 increasing monotonically with sheet resistance over four orders of magnitude. Despite this strong correlation between T_0 and disorder, T_c exhibits no systematic dependence on T_0, indicating a decoupling between localization physics and the superconducting energy scale. Magnetotransport measurements are not well described by the standard BCS model nor the dirty type-II Werthamer-Helfand-Hohenberg model. The phase boundary is instead captured by a free-exponent power law, μ_0 H_c2(T) = μ_0 H_c2(0)[1 − (T/T_c)^n] with n ≈ 3.47, and extrapolates to μ_0 H_c2(0) ≈ 6.4 T. The films have an extracted coherence length of 7 nm. These results establish IBAS-grown ZrN as a broadly tunable platform for investigating disorder-driven transport and the crossover between metallic conduction, electronic localization, and superconductivity.
ER -