Two-gap superconductivity in single crystal Lu$_2$Fe$_3$Si$_5$ from penetration depth measurements

R. Gordon; M. D. Vannette; C. Martin; Y. Nakajima; T. Tamegai; R. Prozorov

doi:10.1103/PhysRevB.78.024514

Two-gap superconductivity in single crystal Lu$_2$Fe$_3$Si$_5$ from penetration depth measurements

Superconductivity 2009-02-02 v1 Strongly Correlated Electrons

Authors: R. Gordon , M. D. Vannette , C. Martin , Y. Nakajima , T. Tamegai , R. Prozorov

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Abstract

Single crystal of Lu $_2$ Fe $_3$ Si $_5$ was studied with the tunnel-diode resonator technique in Meissner and mixed states. Temperature dependence of the superfluid density provides strong evidence for the two-gap superconductivity with almost equal contributions from each gap of magnitudes $\Delta_1/k_BT_c=1.86$ and $\Delta_1/k_BT_c=0.54$ . In the vortex state, pinning strength shows unusually strong temperature dependence and is non-monotonic with the magnetic field (peak effect). The irreversibility line is sharply defined and is quite distant from the $H_{c2}(T)$ , which hints on to enhanced vortex fluctuations in this two-gap system. Altogether our findings provide strong electromagnetic - measurements support to the two-gap superconductivity in Lu $_2$ Fe $_3$ Si $_5$ previously suggested from specific heat measurements.

Keywords

two-gap superconductivity Lu$_2$Fe$_3$Si$_5$ penetration depth superfluid density vortex state pinning strength peak effect irreversibility line

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@article{arxiv.0801.0269,
  title  = {Two-gap superconductivity in single crystal Lu$_2$Fe$_3$Si$_5$ from penetration depth measurements},
  author = {R. Gordon and M. D. Vannette and C. Martin and Y. Nakajima and T. Tamegai and R. Prozorov},
  journal= {arXiv preprint arXiv:0801.0269},
  year   = {2009}
}

Two-gap superconductivity in single crystal Lu$_2$Fe$_3$Si$_5$ from penetration depth measurements

Abstract

Keywords

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