Stand alone experimental setup for dc transport measurements

Суслов, А. В.

doi:10.1063/1.3463691

Cited by 13 publications

(3 citation statements)

References 2 publications

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“…This in effect will eliminate the noise due to thermoelectric e. m.f. A detailed description of the delta mode measurements can be found in a white paper available with the Keithely website [43] and elsewhere [44]. Resistance as a function of temperature (R-T) was also monitored to measure the transition temperature of the W-nanowires.…”

Section: Methodsmentioning

confidence: 99%

On the switching current and the re-trapping current of tungsten nanowires fabricated by Focussed Ion Beam (FIB) technique

et al. 2021

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We report the superconducting properties of the tungsten (W) nanowires fabricated using focussed ion beam (FIB) technique having different wire widths of ∼120 nm and ∼290 nm. The transport properties of these wires were measured down to a temperature of 20 mK in a dilution refrigerator. We observed hysteretic current- voltage characteristics (IVCs) as a function of temperature, wherein the extend of hysteresis (difference between switching current and re-trapping current) is larger at lower temperature and diminishes near to the transition temperature. The temperature dependence of the switching current and re-trapping current were analysed using conventional models and found out to be of reasonable agreement with the models invoked. The re-trapping current agrees well with the thermal model incorporating phonon contribution in the heat dissipation process along with the electronic contribution. The equilibrium electron temperature calculated using the heat dissipation models at the critical current of the wires agrees well with respect to the transition temperature of the wire having a larger width, while for the wire of lower width, it is slightly elevated. Based on the analysis, it is believed that heat dissipation primarily because of Joule heating is the cause of the hysteretic current voltage characteristics of the nanowires.

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Section: Methodsmentioning

confidence: 99%

On the switching current and the re-trapping current of tungsten nanowires fabricated by Focussed Ion Beam (FIB) technique

et al. 2021

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“…Our measurements used the direct current reversal technique, and the experimental setup was an improved version of the system described in ref. 66 .…”

Section: Methodsmentioning

confidence: 99%

Spatially inhomogeneous electron state deep in the extreme quantum limit of strontium titanate

et al. 2016

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When an electronic system is subjected to a sufficiently strong magnetic field that the cyclotron energy is much larger than the Fermi energy, the system enters the extreme quantum limit (EQL) and becomes susceptible to a number of instabilities. Bringing a three-dimensional electronic system deeply into the EQL can be difficult however, since it requires a small Fermi energy, large magnetic field, and low disorder. Here we present an experimental study of the EQL in lightly-doped single crystals of strontium titanate. Our experiments probe deeply into the regime where theory has long predicted an interaction-driven charge density wave or Wigner crystal state. A number of interesting features arise in the transport in this regime, including a striking re-entrant nonlinearity in the current–voltage characteristics. We discuss these features in the context of possible correlated electron states, and present an alternative picture based on magnetic-field induced puddling of electrons.

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“…A method called the Delta mode using a precise nano-voltmeter controlled by AC source largely eliminates the influence of low-frequency disturbance, e.g. DC offset or thermoelectric voltages [30][31][32].…”

Section: Magnetotransport -Technical Aspects Of the Measurement Systemmentioning

confidence: 99%

Metrology and Measurement Systems

Śliż,

Sankowska,

Bobko

et al. 2021

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The paper covers some measurement aspects of transport of electrons through metals and semiconductors in magnetic field -magnetotransport -allowing for the determination of electrical parameters characteristic of three-dimensional (3D) topological insulators (TI) (i.e. those that behave like an insulator inside their volume and have a conductive layer on their surface). A characteristic feature of the 3D TI is also a lack of differences between the chemical composition of the conductive surface and the interior of the material tested and the fact that the electron states for its surface conductivity are topologically protected. In particular, the methods of generating strong magnetic fields, obtaining low temperatures, creating electrical contacts with appropriate geometry were presented, and the measurement methods were reviewed. In addition, the results of magnetotransport measurements obtained for two volumetric samples based on the HgCdTe compound grown with the molecular beam epitaxy method are presented.

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Stand alone experimental setup for dc transport measurements

Cited by 13 publications

References 2 publications

On the switching current and the re-trapping current of tungsten nanowires fabricated by Focussed Ion Beam (FIB) technique

On the switching current and the re-trapping current of tungsten nanowires fabricated by Focussed Ion Beam (FIB) technique

Spatially inhomogeneous electron state deep in the extreme quantum limit of strontium titanate

Metrology and Measurement Systems

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