Muon-spin-rotation measurements of the penetration depth in Li_2Pd_3B

Details Muon-spin-rotation measurements of the penetration depth in Li_2Pd_3B Muon-spin-rotation measurements of the penetration depth in Li_2Pd_3B

2006-01-09

arxiv.org/abs/cond-mat/0601156v2

Phys. Rev. B 73, 214528 (2006)

Physics

Condensed Matter

Superconductivity

6 pages, 7 figures

Scientific paper

10.1103/PhysRevB.73.214528

Measurements of the magnetic field penetration depth $\lambda$ in the ternary boride superconductor Li$_2$Pd$_3$B ($T_c\simeq7.3$ K) have been carried out by means of muon-spin rotation ($\mu$SR). The absolute values of $\lambda$, the Ginzburg-Landau parameter $\kappa$, and the first $H_{c1}$ and the second $H_{c2}$ critical fields at T=0 obtained from $\mu$SR were found to be $\lambda(0)=252(2)$ nm, $\kappa(0)=27(1)$, $\mu_0H_{c1}(0)=9.5(1)$ mT, and $\mu_0H_{c2}(0)=3.66(8)$ T, respectively. The zero-temperature value of the superconducting gap $\Delta_0=$1.31(3) meV was found, corresponding to the ratio $2\Delta_0/k_BT_c=4.0(1)$. At low temperatures $\lambda(T)$ saturates and becomes constant below $T\simeq 0.2T_c$, in agreement with what is expected for s-wave BCS superconductors. Our results suggest that Li$_2$Pd$_3$B is a s-wave BCS superconductor with the only one isotropic energy gap.

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