Angle-dependent electron spin resonance of <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" altimg="si0008.gif" overflow="scroll"><mml:mrow><mml:msub><mml:mrow><mml:mi>YbRh</mml:mi></mml:mrow><mml:mrow><mml:mn>2</mml:mn></mml:mrow></mml:msub><mml:msub><mml:mrow><mml:mi>Si</mml:mi></mml:mrow><mml:mrow><mml:mn>2</mml:mn></mml:mrow></mml:msub></mml:mrow></mml:math> measured with planar microwave resonators and in-situ rotation

Bondorf, Linda; Beutel, Manfred H.; Thiemann, Matthias; Dressel, Martin; Bothner, Daniel; Sichelschmidt, J.; Kliemt, Kristin; Krellner, C.; Scheffler, Marc

doi:10.1016/j.physb.2017.10.046

Cited by 5 publications

(3 citation statements)

References 35 publications

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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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“…[1][2][3][4][5][6][7][8][9] In astronomy and particle physics, highly sensitive kinetic inductance detectors (KIDs) can easily be multiplexed. [10][11][12][13] In solid state spectroscopy, [14][15][16] planar superconducting resonators probe the microwave properties of numerous material classes of interest, ranging from conventional [17][18][19][20][21][22][23][24][25] and unconventional superconductors [26][27][28][29][30][31][32][33][34] to heavy-fermion metals, 14,35 quantum paraelectrics, 36,37 various magnetic and spin systems, [38][39][40][41][42][43][44] and dielectric thin films. [45][46][47] Realization of on-chip superconducting...…”

Section: Introductionmentioning

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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“…Currently available piezo positioners, however, become a viable low-temperature alternative with an unmatched level of precision. They can be employed for tuning the resonance frequency of Fabry-Perot cavities 5 , adjusting the frequency of planar microresonators 6 , or performing sample rotation with a required orientation in an external static magnetic field 7 . Driving a piezo crystal, however, leads to inevitable heat dissipation which requires special attention to cooling of the positioner.…”

Section: Introductionmentioning

confidence: 99%

Experimental cell with a Fabry–Pérot resonator tuned in situ for magnetic resonance studies of matrix-isolated radicals at temperatures below 1 K

Sheludiakov

Lee

Khmelenko

et al. 2020

Review of Scientific Instruments

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We describe the design and construction of an experimental cell for the study of free radicals in macroscopically thick films of solidified molecular and rare gases by 128 GHz Electron Spin Resonance (ESR) at temperatures below 1 K. The ESR resonator has an open Fabry-Perot design and its frequency can be tuned in situ by adjusting the spacing between the mirrors. The tuning mechanism consists of a piezo positioner and stainless-steel edge-welded bellows which can change the resonator frequency by at least 6 GHz. The films of solidified gases can be deposited either directly from a room temperature reservoir or by recondensing from a specially arranged chamber. The free radicals can be created in the solid films by dissociating matrix species by running an rf discharge in helium vapor. We suggest that such a sample cell design can also be used for a broad range of low-temperature ESR experiments where sample cooling needs to be enhanced by the presence of superfluid helium.

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Angle-dependent electron spin resonance of YbRh2Si2 measured with planar microwave resonators and in-situ rotation

Cited by 5 publications

References 35 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)$_3$

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

Experimental cell with a Fabry–Pérot resonator tuned in situ for magnetic resonance studies of matrix-isolated radicals at temperatures below 1 K

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