Heating Causes Nonlinear Microwave Absorption Anomaly in Single‐Walled Carbon Nanotubes

Márkus, B. G.; Gyüre-Garami, B.; Sági, O.; Csősz, G.; Karsa, Anita; Márkus, Ferenc; Simón, F.

doi:10.1002/pssb.201800258

Cited by 3 publications

(3 citation statements)

References 48 publications

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“…We hope that based on the presented Lagrangian formulation, the electromagnetic and the thermal fields can couple, by which further studies may be possible in the case of electromagnetic radiation in media. We believe that beyond the mentioned cases in the motivation [2][3][4][5][6][7][8][9][10], the method can even be extended to materials with magnetic behavior [31].…”

Section: Discussionmentioning

confidence: 99%

“…The microwave cavity perturbation experiments [1], are generally used to explore the material structure measuring the resonance frequency [2]. Wide range of electric conductive novel materials can be studied like Li 4 C 60 superionic conductor [3], single wall carbon nanotubes [4], with these high accuracy measurements [5]. It seems that this experimental setup is applicable to study superconductor powders [6].…”

Section: Motivationmentioning

confidence: 99%

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Generalized Hertz Vector in the Dissipative Electrodynamics

Gambár¹,

Márkus²

2023

WJP

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In the electromagnetic theory, the Hertz vector reduces the number of potentials in the free fields. The further advantage of this potential is that it is much easier to solve particular radiation processes. It indicates that the related method is sometimes more effective than the scalar and vector potential-based relations. Finally, the measurable field variables, the electric and magnetic fields, can be deduced by direct calculation from the Hertz vector. However, right now, the introduction of the Hertz vector operates if the conductive current density j = 𝜎E is neglected. We suggest a generalization by the conductive currents, i.e., when the electromagnetic field dissipates irreversibly to Joule heat. The presented procedure enables us to introduce also the Lagrangian formulation of the discussed dissipated electromagnetic waves. It paves a new way involving damping physical fields in a thermodynamic frame.

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Section: Discussionmentioning

confidence: 99%

Section: Motivationmentioning

confidence: 99%

Generalized Hertz Vector in the Dissipative Electrodynamics

Gambár¹,

Márkus²

2023

WJP

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“…Such measurements in the time domain have two important advantages: enhanced accuracy (also known as the Connes advantage 42 ) since the measurement is traced back to a stable frequency, and a simultaneous measurement of the whole resonator response (also known as Fellgett or multiplex advantage 43 ). This time-resolved, pulsed resonator readout method has been successfully employed to evidence a heating related microwave absorption anomaly in carbon nanotubes 44 and to improve the measurement accuracy of power absorbed from an RF field in magnetic ferrite nanoparticles during hyperthermia 45 . These results motivate the present study to explore the possibility to use this method for the detection of time-resolved µ-PCD studies in silicon.…”

mentioning

confidence: 99%

Ultrafast sensing of photoconductivity decay using microwave resonators

Gyüre-Garami

Blum

Sági

et al. 2019

Journal of Applied Physics

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Microwave reflectance probed photoconductivity (or µ-PCD) measurement represents a contactless and non-invasive method to characterize impurity content in semiconductors. Major drawbacks of the method include a difficult separation of reflectance due to dielectric and conduction effects and that the µ-PCD signal is prohibitively weak for highly conducting samples. Both of these limitations could be tackled with the use of microwave resonators due to the well-known sensitivity of resonator parameters to minute changes in the material properties combined with a null measurement. A general misconception is that time resolution of resonator measurements is limited beyond their bandwidth by the readout electronics response time. While it is true for conventional resonator measurements, such as those employing a frequency sweep, we present a time-resolved resonator parameter readout method which overcomes these limitations and allows measurement of complex material parameters and to enhance µ-PCD signals with the ultimate time resolution limit being the resonator time constant. This is achieved by detecting the transient response of microwave resonators on the timescale of a few 100 ns during the µ-PCD decay signal. The method employs a high-stability oscillator working with a fixed frequency which results in a stable and highly accurate measurement.

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Three dimensional carbon aerogel for microwave absorption from chitosan

2023

Synthetic Metals

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Heating Causes Nonlinear Microwave Absorption Anomaly in Single‐Walled Carbon Nanotubes

Cited by 3 publications

References 48 publications

Generalized Hertz Vector in the Dissipative Electrodynamics

Generalized Hertz Vector in the Dissipative Electrodynamics

Ultrafast sensing of photoconductivity decay using microwave resonators

Three dimensional carbon aerogel for microwave absorption from chitosan

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