Magnetostriction in the mixed state of superconducting 2H-NbSe2 single crystals

Abstract

412-418E r em enko V. V., Sir enko V. A., S chleser R ., and G am me P. L.M agn etost riction in th e mixed sta te of sup erc ondu cting 2H-Nb Se2 sing le cryst alsEr eme nko V. V. , Sire nko V. A ., Sc hleser R., and G am me P . L.Ma gne tostr iction in the mixed stat e of supe rco nduc ting 2H-NbSe2 sing l e crystal sE re men ko V. V., Sir enko V. A. , Sch l e ser R ., an d G amm el P. L.M ag neto strict i o n i n the mixed state of superconducting 2H-Nb Se 2 si n gle cr ystalsEr em enko V. V., Sir enko V. A., S chleser R ., and G am me l P . L.Ma gne tostr iction in t he mixed state of superconducting 2H-Nb Se 2 si n gle cr ystals Magnetostriction measurements on 2H-NbSe 2 single crystals in the temperature range 1.5-8 K in a magnetic field up to 14 T are reported. Peak and oscillations in the measured field dependences of magnetostriction were observed near H c2 . The reversible and irreversible components are separated and analyzed in the region of peak. The scaling parameters are defined, the contribution of the elastic constants dependence on magnetic field is demonstrated. The oscillatory component is discussed regarding Landau quantization of electronic spectrum.

Model calculations for the high-field peak of the fish-tail effect in the magnetostriction of type-II superconductors

“…Although our model calculations can reproduce various experimental data by various trials or selecting appropriate parameters, as an example, we present here only the calculations to reproduce the experimental data for a 2H-NbSe 2 single crystal at 1.5 K under a field up to14 T, published by Eremenko et al [17] (see Fig. 1c in this reference).…”

“…The main objective of this work is to show that the experimental observations reported by Eremenko et al [17] for the magnetostriction in 2H-NbSe 2 single crystals can be well reproduced by exploiting a Gaussian term added exponential model. For comparison, we also present the magnetostriction calculations using a Lorentzian term added Kim model for the field dependences of the critical current density.…”

“…In some magnetostriction measurements performed on type-II superconductors, an anomalous peak in L/L versus H a curve was observed in fields slightly below the upper critical field H c2 [17,18]. This unusual behavior of magnetostriction in superconductors was called fish-tail or peak-effect.…”

“…[1] was used by other authors for more realistic geometries [2][3][4][5][6][7][8][9]. The magnetostriction was also measured for various type-II superconductors [10][11][12][13][14][15][16][17][18][19][20].…”

Effect of Transport Current on the Pinning Induced Magnetostriction of Type-II Superconductors

“…As verified by a great number of papers [11][12][13][14][15][16][17][18][19][20][21][22][23][24], this results in an anomalous irreversible magnetostriction and shape distortion in type-II superconductors with strong pinning. The objective of this work is to provide a model to calculate the internal stress and magnetostriction that occurs when a current is transported through a superconductor in absence and presence of the external field in slab geometry within the critical state model.…”