Experimental Presentation of Microwave Absorption due to Shaking of JV by AC Magnetic Field in Bi2212 and Bi2223

A memory effect in the Josephson vortex system created by magnetic field in the highly anisotropic superconductors Bi2212 and Bi2223 is demonstrated using microwave power absorption. This surprising effect appears despite a very low viscosity of Josephson vortices compared to Abrikosov vortices. The superconductor is field cooled in DC magnetic field H m oriented parallel to the CuO planes through the critical temperature T c down to 4K, with subsequent reduction of the field to zero and again above H m . Large microwave power absorption signal is observed at a magnetic field just above the cooling field clearly indicating a memory effect. The dependence of the signal on deviation of magnetic field from H m is the same for a wide range of H m from 0.15T to 1.7T. 1Many complex disordered systems in nature fail to equilibrate with their environment below certain temperature. Examples include various glasses, from window glass to spin glass [1]. The glassy metastable frustrated state gives rise to novel and unusual behavior such as memory effects, ageing and nonlinear dynamics. In recent years the glass family has significantly expanded and now it includes additional effects such as domain walls [2], two dimensional electron gas [3] and Abrikosov vortices in type II superconductors under magnetic fields (see [4] and references therein).The glassy vortex state is usually prepared by field-cooling (FC) the sample containing quenched disorder across the superconducting transition temperature T c (H). A memory phenomenon in superconductors is usually studied as a response to an applied perturbation which suddenly disturbs the superconductor. After removing the perturbation, subsequent response shows the memory effects, i.e. the rate of the magnetic relaxation, for example, is slower in "older" systems than in "younger" ones [4]. Experiments on different conventional Here we report an entirely different manifestation of the memory effect in strongly anisotropic high T c superconductors. In these superconductors, magnetic field directed parallel to the layers penetrates the sample as a system of Josephson vortices (JV) qualitatively distinct from Abrikosov vortices (AV) appearing when the magnetic field is perpendicular to the layers (or in less anisotropic materials like in most conventional superconductors and optimally doped Y BaCuO). It is well known that for sufficiently strong disorder the AV form vortex glass [7]. In JV system a randomly distributed set of defects of the layered structure (microresistences [8]), is analogous to the quenched disorder pinning AV in the conventional vortex glass. Apparently the pinning of JV is expected to be less effective than the pinning of the AV since the JV are coreless. However as it was shown (see [8]) these JV can be pinned.In this note we demonstrate the formation of the glassy state of the JV [8] inBi 2 Sr 2 Ca 1 Cu 2 O δ (Bi2212) and Bi 2 Sr 2 Ca 2 Cu 3 O δ (Bi2223) single crystals. The memory properties are studied by measuring the microwave power absorption (MPA...

show abstract

“…[9,10] for details. A microwave source feeds a rectangular H102 cavity where a optimally grown Bi2212 or Bi2223 crystal (sizes 1 × 1 × 0.1mm…”

mentioning

confidence: 99%

Field cooling memory effect in Bi2212 and Bi2223 single crystals

Shaltiel

Nidda

Rosenstein

et al. 2010

Supercond. Sci. Technol.

View full text Add to dashboard Cite

show abstract

“…The memory effect disappears when the temperature T t exceeded 35 K and 15 K in Bi2212 and Bi2223 respectively. The memory effect is explained using the hierarchical model for spin glasses [10]. (6) Irreversibility effect.…”

Section: Discussionmentioning

confidence: 99%

On investigation of high Tc superconductors with Electron Paramagnetic Resonance spectrometers

Shaltiel

Nidda

Shapiro

et al. 2010

Physica C: Superconductivity

Self Cite

View full text Add to dashboard Cite

“…The angular dependence of the upper critical field at temperatures close to the critical temperature, T c0 , was investigated by non-resonant microwave absorption. This technique has only been applied so far to study the properties of bulk superconductors [57][58][59][60][61][62][63][64][65][66] . In most cases the Induced Microwave Dissipation by AC Magnetic Field (IMDACMF) technique has been used [61][62][63][64][65][66] , which we also apply for the measurements of the present work.…”

Section: Experimental Methodsmentioning

confidence: 99%

“…This technique has only been applied so far to study the properties of bulk superconductors [57][58][59][60][61][62][63][64][65][66] . In most cases the Induced Microwave Dissipation by AC Magnetic Field (IMDACMF) technique has been used [61][62][63][64][65][66] , which we also apply for the measurements of the present work. Sketches of the experimental set up, including the relative orientation of the high frequency (HF) microwave field, the static (DC) magnetic field and the modulating (AC) magnetic field applied, are given by Shaltiel et al [62][63][64][65][66] .…”

Section: Experimental Methodsmentioning

confidence: 99%

“…In most cases the Induced Microwave Dissipation by AC Magnetic Field (IMDACMF) technique has been used [61][62][63][64][65][66] , which we also apply for the measurements of the present work. Sketches of the experimental set up, including the relative orientation of the high frequency (HF) microwave field, the static (DC) magnetic field and the modulating (AC) magnetic field applied, are given by Shaltiel et al [62][63][64][65][66] . The basic mechanism of the microwave absorption in this technique is that the magnetic state is defined by the DC magnetic field, whereas the AC modulation tends to reduce the pinning energy of the vortices by 'shaking' them.…”

Section: Experimental Methodsmentioning

confidence: 99%

See 1 more Smart Citation

Influence of the FFLO-like state on the upper critical field of a superconductor/ferromagnet bilayer: Angular and temperature dependence

Lenk¹,

Hemmida²,

Morari³

et al. 2016

Phys. Rev. B

Self Cite

View full text Add to dashboard Cite

We investigated the upper critical magnetic field, Hc, of a superconductor-ferromagnet (S/F) bilayer of Nb/Cu41Ni59 and a Nb film (as reference). We obtained the dependence of H c⊥ and H c (perpendicular and parallel to the film plane, respectively) on the temperature, T , by measurements of the resistive transitions and the dependence on the inclination angle, θ, of the applied field to the film plane, by non-resonant microwave absorption. Over a wide range, H c⊥ and H c show the temperature dependence predicted by the Ginzburg-Landau theory. At low temperatures and close to the critical temperature deviations are observed. While Hc(θ) of the Nb film follows the Tinkham prediction for thin superconducting films, the Nb/Cu41Ni59-bilayer data exhibit deviations when θ approaches zero. We attribute this finding to the additional anisotropy induced by the quasi-onedimensional Fulde-Ferrell-Larkin-Ovchinnikov (FFLO)-like state and propose a new vortex structure in S/F bilayers, adopting the segmentation approach from high-temperature superconductors. arXiv:1604.03361v1 [cond-mat.supr-con]

show abstract

Experimental Presentation of Microwave Absorption due to Shaking of JV by AC Magnetic Field in Bi2212 and Bi2223

Cited by 4 publications

References 17 publications

Field cooling memory effect in Bi2212 and Bi2223 single crystals

Field cooling memory effect in Bi2212 and Bi2223 single crystals

On investigation of high Tc superconductors with Electron Paramagnetic Resonance spectrometers

Influence of the FFLO-like state on the upper critical field of a superconductor/ferromagnet bilayer: Angular and temperature dependence

Contact Info

Product

Resources

About