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• W2021471509 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 first critical field H${}_{c1}$, determined from a zero-temperature extrapolation, is around 18 mT. Using the tunnel-diode resonator technique, the London penetration depth was measured with no applied dc field and the Campbell penetration depth was measured with the external dc fields up to 9 T for two different sample orientations with respect to the direction of applied magnetic field. The absolute value of the London penetration depth, $ensuremath{lambda}(0)=245ifmmodepmelsetextpmfi{}10$ nm, was determined from the thermodynamic Rutgers formula. The superfluid density, ${ensuremath{rho}}_{s}={[ensuremath{lambda}(0)/ensuremath{lambda}(T)]}^{2}$, was found to follow the clean isotropic $s$-wave behavior predicted by the weak-coupling BCS theory in the whole temperature range. The low-temperature behavior of the London penetration depth fits the BCS analytic form as well and produces a value close to the weak coupling one of $ensuremath{Delta}(0)/({k}_{B}{T}_{c})=1.71$. The temperature dependence of the upper critical field ${H}_{c2}$ was found to be isotropic with a slope at T${}_{c}$ of $ensuremath{-}$2.6 T/K and H${}_{c2}$(0) $ensuremath{approx}$ 12.3 T at zero temperature. The Campbell penetration depth probes the vortex lattice response in the mixed state and is sensitive to the details of the pinning potential. For MgCNi${}_{3}$, 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 nonmonotonic field dependence and has commonly been referred to as the peak effect. It is most likely related to a field-dependent nonparabolic pinning potential." @default.
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• W2021471509 date "2013-03-27" @default.
• W2021471509 modified "2023-10-16" @default.
• W2021471509 title "Conventional superconductivity and hysteretic Campbell penetration depth in single crystals MgCNi<mml:math xmlns:mml=http://www.w3.org/1998/Math/MathML display=inline><mml:msub><mml:mrow /><mml:mn>3</mml:mn></mml:msub></mml:math>" @default.
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• W2021471509 doi "https://doi.org/10.1103/physrevb.87.094520" @default.
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