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16 April 2024 |
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Conventional superconductivity and hysteretic Campbell penetration depth in single crystals MgCNi$_3$ | | R. T. Gordon
; N. D. Zhigadlo
; S. Weyeneth
; S. Katrych
; R. Prozorov
; | | Date: |
16 Jan 2013 | | Abstract: | Single crystals of MgCNi$_3$, with areas sized up to 1 mm$^{2}$, were grown
by the self flux method using a cubic anvil high pressure technique. In low
applied fields, the dc magnetization exhibited a very narrow transition into
the superconducting state, demonstrating good quality of the grown crystals.
The low critical field H$_{c1}$, determined from a zero temperature
extrapolation, is around 18 mT. The magnetic penetration depth for a single
crystal sample has also been measured in dc fields up to 9 T using a tunnel
diode resonator (TDR) circuit technique for two different sample orientations
with respect to the direction of applied magnetic field. The superfluid density
was constructed from the London penetration depth, which was measured in zero
applied dc field, and it was found to follow the clean s-wave behavior
predicted by the BCS theory quite well. The temperature dependence of the upper
critical field, $H_{c2}$, was found to be isotropic with a slope at T$_c$ of
-2.6 T/K and H$_{c2}$(0) $approx$ 12.3 T at zero temperature. In sufficiently
high enough applied dc magnetic fields, the TDR probes the vortex lattice
response of superconductors in the mixed state. For this material, an
irreversible feature has been observed in the TDR response when the sample is
field-cooled and warmed versus zero-field-cooled and warmed. This feature
possesses a non-monotonic field dependence and has commonly been referred to as
the peak effect. | | Source: | arXiv, 1301.3561 | | Services: | Forum | Review | PDF | Favorites | |
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