Metallic coplanar resonators optimized for low-temperature measurements

Rahim, Mojtaba Javaheri; Lehleiter, Thomas; Bothner, Daniel; Krellner, C.; Koelle, D.; Kleiner, R.; Dressel, Martin; Scheffler, Marc

doi:10.1088/0022-3727/49/39/395501

Cited by 16 publications

(11 citation statements)

References 49 publications

(67 reference statements)

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“…We employ coplanar waveguide resonators to measure electron spin resonance (ESR) at multiple frequencies down to mK temperatures. The details of the design, manufacturing, performance have been published in a series of articles over the past years (65)(66)(67)(68)(69)(70)(71). The chip with the metallic waveguide is mounted in a brass sample box (Fig.…”

Section: F Possible Coupling Of the Defect Spins To The Cu 2+ Impuritiesmentioning

confidence: 99%

Gapped magnetic ground state in quantum-spin-liquid candidate $κ$-(BEDT-TTF)$_2$-Cu$_2$(CN)$_3$

Miksch,

Pustogow,

Rahim

et al. 2020

Preprint

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Geometrical frustration, quantum entanglement and disorder may prevent long-range order of localized spins with strong exchange interactions, resulting in a novel state of matter. κ-(BEDT-TTF) 2 Cu 2 (CN) 3 is considered the best approximation of this elusive quantum-spin-liquid state, but its ground-state properties remain puzzling. Here we present a multi-frequency electron-spin resonance study down to millikelvin temperatures, revealing a rapid drop of the spin susceptibility at T * = 6 K. This opening of a spin gap, accompanied by structural modifications, suggests the enigmatic '6 K-anomaly' as the tran-

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Section: F Possible Coupling Of the Defect Spins To The Cu 2+ Impuritiesmentioning

confidence: 99%

Gapped magnetic ground state in quantum-spin-liquid candidate $κ$-(BEDT-TTF)$_2$-Cu$_2$(CN)$_3$

Miksch,

Pustogow,

Rahim

et al. 2020

Preprint

Self Cite

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“…The α could be, however, accurately determined, without the need for graphene removal and separate cooldown, in the quantum Hall regime where the conductance of the device is known. For this purpose, due to the large magnetic fields, copper resonators [43] have to be fabricated which will also enable measurements at elevated temperatures.…”

Section: Discussionmentioning

confidence: 99%

Contactless Microwave Characterization of Encapsulated Graphene p−n Junctions

et al. 2017

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Accessing intrinsic properties of a graphene device can be hindered by the influence of contact electrodes. Here, we capacitively couple graphene devices to superconducting resonant circuits and observe clear changes in the resonance frequency and widths originating from the internal charge dynamics of graphene. This allows us to extract the density of states and charge relaxation resistance in graphene p-n junctions without the need for electrical contacts. The presented characterization paves a fast, sensitive, and noninvasive measurement of graphene nanocircuits.

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“…Our resonator thus acts like an on-chip ESR spectrometer. 14,83,84 Fig. 10 shows such an experiment, where the DPPH is deposited at 'position 1' at the short-circuited end of the λ/2-type resonator of R f : for all harmonics of the the CPW resonator, this position features a maximum of current and microwave magnetic field, and thus all harmonics should exhibit a clear ESR signal.…”

Section: F Esr Markersmentioning

confidence: 99%

Characterization of harmonic modes and parasitic resonances in multi-mode superconducting coplanar resonators

Beydeda¹,

Nikolaou²,

Tochtermann³

et al. 2023

Preprint

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Planar superconducting microwave transmission line resonators can be operated at multiple harmonic resonance frequencies. This allows covering wide spectral regimes with high sensitivity, as it is desired e.g. for cryogenic microwave spectroscopy. A common complication of such experiments is the presence of undesired 'spurious' additional resonances, which are due to standing waves within the resonator substrate or housing box. Identifying the nature of individual resonances ('designed' vs. 'spurious') can become challenging for higher frequencies or if elements with unknown material properties are included, as is common for microwave spectroscopy. Here we discuss various experimental strategies to distinguish designed and spurious modes in coplanar superconducting resonators that are operated in a broad frequency range up to 20 GHz. These strategies include tracking resonance evolution as a function of temperature, magnetic field, and microwave power. We also demonstrate that local modification of the resonator, by applying minute amounts of dielectric or ESR-active materials, lead to characteristic signatures in the various resonance modes, depending on the local strength of the electric or magnetic microwave fields.

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Metallic coplanar resonators optimized for low-temperature measurements

Cited by 16 publications

References 49 publications

Gapped magnetic ground state in quantum-spin-liquid candidate $κ$-(BEDT-TTF)$_2$-Cu$_2$(CN)$_3$

Gapped magnetic ground state in quantum-spin-liquid candidate $κ$-(BEDT-TTF)$_2$-Cu$_2$(CN)$_3$

Contactless Microwave Characterization of Encapsulated Graphene p−n Junctions

Characterization of harmonic modes and parasitic resonances in multi-mode superconducting coplanar resonators

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