Ultrasonic attenuation by the vortex lattice of high-<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:msub><mml:mrow><mml:mi mathvariant="italic">T</mml:mi></mml:mrow><mml:mrow><mml:mi mathvariant="italic">c</mml:mi></mml:mrow></mml:msub></mml:mrow></mml:math>superconductors

Pankert, J.; Marbach, Gerolf; Comberg, A.; Lemmens, P.; Fröning, P.; Ewert, S.

doi:10.1103/physrevlett.65.3052

Cited by 86 publications

(36 citation statements)

References 30 publications

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“…The attenuation of sound was predicted by Pankert for the thermally activated flux flow ͑TAFF͒ regime valid above the irreversibility line: It originates from thermally activated jumps of vortices between pinning centers when vortices follow oscillating pinning centers. Experimental data 10 confirmed the main theoretical predictions of Pankert in that temperature range.…”

Section: Introductionsupporting

confidence: 84%

Interaction of vortices with ultrasound and the acoustic Faraday effect in type-II superconductors

et al. 1996

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We study the interaction of sound waves with vortices in type-II superconductors, taking into account pinning and electrodynamic forces between vortices and crystal displacements. We propose ultrasound techniques as a method for obtaining information about vortex dynamics. This is particularly appropiate at low temperatures where transport measurements are ineffective. The changes in sound velocity and attenuation due to vortices, can provide information on the elastic constants of the vortex system and on vortex dissipation, respectively. At low temperatures the Magnus force acting on vortices leads to the acoustic Faraday effect: there is a rotation of the polarization plane of tranverse sound waves propagating along the magnetic field. This effect is linear in the Magnus force and magnetic field in crystals with equivalent a and b axes for a field parallel to the c axis. We discuss how this effect can be measured by means of either pulse-echo techniques or standing sound waves. Also, we show that an ac electromagnetic field acting on the vortex system can generate ultrasound. We calculate the amplitude of the generated sound waves in the linear regime and compare with recent experiments.

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Section: Introductionsupporting

confidence: 84%

Interaction of vortices with ultrasound and the acoustic Faraday effect in type-II superconductors

et al. 1996

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“…Before concluding this section it is worth noting that, below the temperature of the peak in 1/T 1 , a marked growth in the acoustic ringing was observed at all field values, mostly for H c. In analogy with an ultra-sound experiment [17], this effect can be qualitatively understood if one assumes that a magneto-acoustic coupling between the VL and the crystal lattice is affecting the magnetic susceptibility of the sample inside the NMR resonating coil. If a liquid-glassy phase transition occurred in the the vortex matter, the thermal excitation would not allow the vortices to overcome the pinning barrier in the glassy state, so they would transfer their elastic energy to the lattice, causing the latter to vibrate.…”

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confidence: 88%

Glassy transition in the vortex lattice of Ba(Fe _0.93 Rh _0.07 ) ₂ As ₂ superconductor probed by NMR and ac-susceptibility

Bossoni¹,

Carretta²,

Horvatić³

et al. 2013

EPL

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-By using Nuclear Magnetic Resonance and ac-susceptibility, the characteristic correlation times for the vortex dynamics, in an iron-based superconductor, have been derived. Upon cooling, the vortex dynamics displays a crossover consistent with a vortex glass transition. The correlation times, in the fast motions regime, merge onto a universal curve which is fit by the Vogel-Fulcher law, rather than by an Arrhenius law. Moreover, the pinning barrier shows a weak dependence on the magnetic field which can be heuristically justified within a fragile glass scenario. In addition, the glass freezing temperatures obtained by the two techniques merge onto the de Almeida-Thouless line. Finally the phase diagram for the mixed phase has been derived.Introduction. -The discovery of iron-based superconductors has brought to a renewed interest in the study of the mixed phase of type-II superconductors and of the nature of the frozen vortex state. In this regard, the effect of quenched disorder on the flux lines lattice (FLL) properties has to be considered, together with the onset of a vortex glassy state [1][2][3][4]. In the case of weakly anisotropic superconductors, such as the 122 family of iron-pnictides, the high temperature (T ) region of the phase diagram is dominated, just below the transition temperature T c , by a high mobility state of vortex lines [5]. On the other hand, the nature of the low temperature vortex lattice (VL) dynamics is still debated, since it involves the complex interplay among the pinning forces, the intervortex repulsion/attraction [6] and the thermal excitations. In a recent theoretical work [7] the free energy of the vortex matter was explicitly calculated for a three dimensional (3D) superconductor, in presence of quenched disorder. Two transitions were found: a first-order melting, at which the quasi-long-range order is destroyed, and a second-order glassy transition. Such double transition has been recently experimentally observed in cuprates [8]. By taking advantage of the work carried out in cuprates,

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“…It is reasonable to observe this process only in a limited temperature range called the "irreversibility line" in HTSC. We should point out that our expression and imply a more clear and simple relation between the vortex glass theory and "irreversibility line", which has been studied but is not clear in Palstra and Pankert [22]. Considering that S and S 0 represent the total increase in dissipation caused by the field and current, respectively, the different mechanisms of dissipation may take an important role in these two behaviors and present different exponents.…”

Section: Resultsmentioning

confidence: 99%

The Magnetoresistance in Iron-based Superconductors

Lv¹,

Xie²,

Liu³

et al. 2011

Journal of Magnetics

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The phase transition of vortex matter from solid to liquid was studied in iron-based superconductors. Based on the traditional vortex glass theory, we have examined the magnetoresistivity data of iron-based superconductors using our extended thermal activation model:. We predict that the magnetic field-dependent area S + S 0 which integrates ρ with T is proportional to B β , where β is the vortex glass transition exponent. From our calculation, the vortex glass transition exponent is 0.33, close to the exponent of area S 0 + S is 0.31 in SmO 0.9 F 0.1 FeAs; the exponent of area S is 0.63, which is close to the irreversibility line exponent 2/3. Both of the results show the validity of our model. In addition, our model is shown to be effective in describing irreversibility behavior in layered superconductors.

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Ultrasonic attenuation by the vortex lattice of high-Tcsuperconductors

Cited by 86 publications

References 30 publications

Interaction of vortices with ultrasound and the acoustic Faraday effect in type-II superconductors

Interaction of vortices with ultrasound and the acoustic Faraday effect in type-II superconductors

Glassy transition in the vortex lattice of Ba(Fe _0.93 Rh _0.07 ) ₂ As ₂ superconductor probed by NMR and ac-susceptibility

The Magnetoresistance in Iron-based Superconductors

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Ultrasonic attenuation by the vortex lattice of high-Tcsuperconductors

Cited by 86 publications

References 30 publications

Interaction of vortices with ultrasound and the acoustic Faraday effect in type-II superconductors

Interaction of vortices with ultrasound and the acoustic Faraday effect in type-II superconductors

Glassy transition in the vortex lattice of Ba(Fe 0.93 Rh 0.07 ) 2 As 2 superconductor probed by NMR and ac-susceptibility

The Magnetoresistance in Iron-based Superconductors

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Glassy transition in the vortex lattice of Ba(Fe _0.93 Rh _0.07 ) ₂ As ₂ superconductor probed by NMR and ac-susceptibility