[419][420][421][422][423][424] Br uk V. V., Er em enko V. V., Makedonskaya N. I., Sha baka yeva Yu. A., an d Si re nko V. A .Investig ation of magnetic flux g rad i e nts in har d super con duct orsBr uk V. V., Er em enko V. V., Makedonskaya N. I., Sha baka yeva Yu. A., an d Si re nko V. A .Investig ation of magnetic flux g rad i e nts in har d super con duct ors Analytical calculations of the transverse magnetostriction in a thin hard superconductor are presented in relation to the distributions of currents and fields within a superconducting specimen in a varied magnetic field. The approach is successfully tested on high-temperature superconductors. The flux distribution derived from magnetostriction measurements is in satisfactory agreement with that obtained from computer processing of magnetooptical images. The magnetic flux distribution below the irreversibility line of hard superconductors is derived from both original magnetization and magnetostriction measurements and image processing. Perfect consistency of the results is obtained for a family of high-temperature superconductors
The layered charge-density wave (CDW) superconductor 2H-NbSe 2 (T S =7.2 K) is the very first material in which quantum oscillations have been observed in the mixed state by means of magnetization and magnetostriction measurements. The magnetostriction technique offers the advantage that quantum oscillations are particularly pronounced, which is due to pressure sensitivity of the relevant cross-section of the Fermi surface. Moreover, measurements can be performed for a field oriented along the crystallographic axis in contrast to the torque technique that is routinely used. Here we present magnetostriction measurement on a highquality single-crystalline sample for temperatures 0.25-8.0 K using a sensitive capacitance dilatometer. Two oscillation frequencies are observed at the lowest temperatures for the inplane orientation of the applied magnetic field. These new data reveal that the Fermi-surface sheet in the first Brillouin zone has two cross-sections, rather than the conventional pancake shape.
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