Periodic microwave absorption in superconducting whiskers

Czyżak, B.; Andrzejewski, B.; Szcześniak, Ł.; Danilova, N. P.; Stankowski, J.

doi:10.1007/bf03162583

Cited by 5 publications

(5 citation statements)

References 14 publications

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“…Modulated microwave absorption on temperature sweep mode has been used to measure twin boundaries in high-T c superconductors [49,64], Bi 2 Sr 2 CaCu 2 O whiskers [65], powder and bulk MgB 2 [66,67], organic superconductors [68], and more recently, ternary borides Mo 2 Re 3 B and Mo 3 Re 2 B [69]. Correlation of the MFMMS signal with the dc magnetization [70] and comparison with the direct absorption technique (no modulation) was addressed for YBa 2 Cu 3 O 7−x [71,72].…”

Section: Temperature Sweepmentioning

confidence: 99%

Magnetic field modulated microwave spectroscopy across phase transitions and the search for new superconductors

Ramírez¹,

Basaran²,

Venta³

et al. 2014

Rep. Prog. Phys.

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This article introduces magnetic field modulated microwave spectroscopy (MFMMS) as a unique and high-sensitivity technique for use in the search for new superconductors. MFMMS measures reflected microwave power as a function of temperature. The modulation induced by the external ac magnetic field enables the use of phase locked detection with the consequent sensitivity enhancement. The MFMMS signal across several prototypical structural, magnetic, and electronic transitions is investigated. A literature review on microwave absorption across superconducting transitions is included. We show that MFMMS can be used to detect superconducting transitions selectively with very high sensitivity.

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Section: Temperature Sweepmentioning

confidence: 99%

Magnetic field modulated microwave spectroscopy across phase transitions and the search for new superconductors

Ramírez¹,

Basaran²,

Venta³

et al. 2014

Rep. Prog. Phys.

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“…Microwave absorption in high-temperature superconductors has been described by Dulcic et al [5] who treated a sample as a system of resistively shunted junctions with a negligible capacitance, driven by the microwave and d.c. current. This model predicted a microwave absorption lineshape with a strong minimum at zero magnetic field and did not describe satisfactorily the microwave absorption signal of a periodic, discrete character with no minimum at zero field, observed experimentally in single crystals [11][12][13]36]. Such a character of the MMMA lineshape suggests a SQUID-like topology of the superconducting loops with two or more junctions.…”

Section: Discussionmentioning

confidence: 73%

“…The whiskers grow as the crystals, with very regular edges and regular low-angle boundaries which are the consequence of the crystal growth along the screw dislocation [21][22][23]. The regular character of the lowangle boundaries results in a regular, periodic signal of the microwave absorption [13]. The periodic, discrete MMMA spectrum in a low magnetic field has also been observed in regularly twinned YBa 2 Cu 3 O x single crystals [11].…”

Section: Single Crystalsmentioning

confidence: 99%

“…Many authors emphasized the significant role of flux motion in the complex mechanisms of high-frequency dissipation in the mixed state [9,10]. However, a periodic signal in the microwave absorption observed experimentally in single crystals [11][12][13] at low magnetic field cannot be explained in terms of the flux motion model and suggests an important role for the Josephson mechanism.…”

Section: Introductionmentioning

confidence: 99%

“…The magnetic field dependence of the high-frequency dissipation has been measured by many authors using standard electron paramagnetic resonance methodology at microwave frequencies [10][11][12][13][14][15][16]. In these experiments, a superconducting sample is usually located in a cavity at the maximum of the magnetic component of the microwave field, which is applied perpendicularly to the external, stationary magnetic field.…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Microwave absorption in high- superconductors in low magnetic fields

Czyżak¹

1996

Supercond. Sci. Technol.

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The existence of inter-and intragrain weak links strongly influences the microwave properties of high-temperature superconductors. Considering the properties of a network of resistively shunted, symmetric double contacts, we obtain a consistent description of the high-frequency dissipation in ceramics and single crystals in low magnetic fields. In this model, the temperature dependence of the high-frequency dissipation is determined by the critical current of the weak links and by the penetration depth. The high-frequency absorption line-width decreases when the penetration depth increases with temperature. The results of the measurements of magnetically modulated microwave absorption in single crystals and ceramics are interpreted in terms of the model presented.

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Lower Josephson critical field in granular HTS measured by microwave absorption

et al. 1995

Self Cite

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Abstrar The method of magnetically modulated microwave absorption (MMMA) has been used here to measure the lower Josephson critical field in a YBaCuO superconductor. The measurements based on the changes in the width of the hysteresis of the MMMA signal which were observed while increasing the range of the magnetic field sweep were carried out. The effects observed by us are explained using the Clem model of the cubic array of superconducting grains. Also, a simple interpretation of the influence of the magnetic modulation on the measured value of the lower Josephson critical field is provided.

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Periodic microwave absorption in superconducting whiskers

Cited by 5 publications

References 14 publications

Magnetic field modulated microwave spectroscopy across phase transitions and the search for new superconductors

Magnetic field modulated microwave spectroscopy across phase transitions and the search for new superconductors

Microwave absorption in high- superconductors in low magnetic fields

Lower Josephson critical field in granular HTS measured by microwave absorption

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