Low-frequency response in the surface superconducting state of single-crystal<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:mrow><mml:msub><mml:mrow><mml:mi mathvariant="normal">ZrB</mml:mi></mml:mrow><mml:mrow><mml:mn>12</mml:mn></mml:mrow></mml:msub></mml:mrow></mml:mrow></mml:math>

Leviev, G. I.; Genkin, V. M.; Tsindlekht, M. I.; Felner, I.; Paderno, Yurii B.; Филиппов, В. Б.

doi:10.1103/physrevb.71.064506

Cited by 30 publications

(36 citation statements)

References 21 publications

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“…A "home-made" measurement cell of the experimental setup was adapted to the SQUID magnetometer. A block diagram of the experimental setup can be found elsewhere [18].…”

Section: Methodsmentioning

confidence: 99%

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dc and ac magnetic properties of thin-walled Nb cylinders with and without a row of antidots

Tsindlekht¹,

Genkin²,

Felner³

et al. 2016

J. Phys.: Condens. Matter

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dc and ac magnetic properties of two thin-walled superconducting Nb cylinders with a rectangular cross-section are reported. Magnetization curves and the ac response were studied on as-prepared and patterned samples in magnetic fields parallel to the cylinder axis. A row of micron-sized antidots (holes) was made in the film along the cylinder axis. Avalanche-like jumps of the magnetization are observed for both samples at low temperatures for magnetic fields not only above Hc1, but in fields lower than Hc1 in the vortex-free region. The positions of the jumps are not reproducible and they change from one experiment to another, resembling vortex lattice instabilities usually observed for magnetic fields larger than Hc1. At temperatures above 0.66Tc and 0.78Tc the magnetization curves become smooth for the patterned and the as-prepared samples, respectively. The magnetization curve of a reference planar Nb film in the parallel field geometry does not exhibit jumps in the entire range of accessible temperatures. The ac response was measured in constant and swept dc magnetic field modes. Experiment shows that ac losses at low magnetic fields in a swept field mode are smaller for the patterned sample. For both samples the shapes of the field dependences of losses and the amplitude of the third harmonic are the same in constant and swept field near Hc3. This similarity does not exist at low fields in a swept mode.

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“…A "home-made" measurement cell of the experimental setup was adapted to the SQUID magnetometer. A block diagram of the experimental setup can be found elsewhere [18].…”

Section: Methodsmentioning

confidence: 99%

“…The sample was inserted into one coil of a balanced pair of coils, and the unbalanced signal was measured by means of lock-in amplifier. The ac magnetic susceptibilities were measured in absolute units, see [18]. A "home-made" measurement cell of the experimental setup was adapted to the SQUID magnetometer.…”

Section: Methodsmentioning

confidence: 99%

dc and ac magnetic properties of thin-walled Nb cylinders with and without a row of antidots

Tsindlekht¹,

Genkin²,

Felner³

et al. 2016

J. Phys.: Condens. Matter

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show abstract

“…A simple phenomenological relaxation model provides the good explanation of the experimental data for DC fields near H c2 only [16]. The relaxation rate in this model depends on the ac frequency and decreased with decreasing ω [16]. Detailed experimental study of the linear ac response in the SSS of single crystals Nb and ZrB 12 was published recently in our paper [4].…”

Section: Introductionmentioning

confidence: 99%

“…A home-made setup was adapted to the SQUID magnetometer, and the block diagram of the experimental setup was published in Ref. [16]. The crystal (10 × 3 × 1 mm…”

Section: B DC and Ac Measurementsmentioning

confidence: 99%

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Linear and nonlinear low-frequency electrodynamics of surface superconducting states in an yttrium hexaboride single crystal

et al. 2008

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We report the low-frequency and tunneling studies of yttrium hexaboride single crystal. Ac susceptibility at frequencies 10 -1500 Hz has been measured in parallel to the crystal surface DC fields, H0. We found that in the DC field H0 > Hc2 DC magnetic moment completely disappears while the ac response exhibited the presence of superconductivity at the surface. Increasing of the DC field from Hc2 revealed the enlarging of losses with a maximum in the field between Hc2 and Hc3. Losses at the maximum were considerably larger than in the mixed and in the normal states. The value of the DC field, where loss peak was observed, depends on the amplitude and frequency of the ac field. Close to Tc this peak shifts below Hc2 which showed the coexistence of surface superconducting states and Abrikosov vortices. We observed a logarithmic frequency dependence of the in-phase component of the susceptibility. Such frequency dispersion of the inphase component resembles the response of spin-glass systems, but the out-of-phase component also exhibited frequency dispersion that is not a known feature of the classic spin-glass response. Analysis of the experimental data with Kramers-Kronig relations showed the possible existence of the loss peak at very low frequencies (< 5 Hz). We found that the amplitude of the third harmonic was not a cubic function of the ac amplitude even at considerably weak ac fields. This does not leave any room for treating the nonlinear effects on the basis of perturbation theory. We show that the conception of surface vortices or surface critical currents could not adequately describe the existing experimental data. Consideration of a model of slow relaxing nonequilibrium order parameter permits one to explain the partial shielding and losses of weak ac field for H0 > Hc2.

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Electron Structure, Transport, and Superconducting Properties of ZrB12, ZrB2, YB6 and MgB2

Gasparov

2010

NATO Science for Peace and Security Series B: Physics and Biophysics

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Low-frequency response in the surface superconducting state of single-crystalZrB12

Cited by 30 publications

References 21 publications

dc and ac magnetic properties of thin-walled Nb cylinders with and without a row of antidots

dc and ac magnetic properties of thin-walled Nb cylinders with and without a row of antidots

Linear and nonlinear low-frequency electrodynamics of surface superconducting states in an yttrium hexaboride single crystal

Electron Structure, Transport, and Superconducting Properties of ZrB12, ZrB2, YB6 and MgB2

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