Superconductivity in the noncentrosymmetric $$\hbox {Li}_2\hbox {Pd}_{3-x}\hbox {Ag}_x\hbox {B}$$ Li 2 Pd 3 - x Ag x B with x = 0.0, 0.1 and 0.3

We studied the partial substitution of Ag in the noncentrosymmetric superconducting compounds Li $$_2$$ Pd $$_{3-x}$$ Ag $$_x$$ B with x = 0.0, 0.1 and 0.3. Magnetization, resistivity and specific heat measurements were performed in this system. From electrical measurements, we obtained the critical temperature $$T_{{\text{c}}}$$ . The upper critical field at zero temperature was determined with Werthamer–Helfand equation, $$\mu _0H^{\rm WHH}_{\text{c2}}(0)$$ , and $$\mu _0H^{\rm linear}_{\text{c2}}(0)$$ and the coherence length, $$\xi (0)$$ . The value of $$\mu _0H^{\rm linear}_{\text{c2}}(0)$$ and $$\mu _0H^{\rm WHH}_{\text{c2}}(0)$$ is lower than the calculated paramagnetic Pauli limit suggesting that the spin-triplet pairing is weak in the system. From specific heat measurements, we obtained the parameters of the normal state; the Sommerfeld coefficient, $$\gamma$$ , the electronic density of states at the Fermi level, $$N(E_{\text{F}})$$ and the Debye temperature, $$\theta _{\rm D}$$ . In the superconducting state, the obtained values were; $$\Delta C/\gamma T_{{\text{c}}}$$ , the electron phonon coupling, $$\lambda _{\rm e-ph}$$ , the superconducting energy gap, $$2\Delta _0$$ , and the ratio $$2\Delta _0 /k_{\rm B} T_{{\text{c}}}$$ . The electronic specific heat is well described by the BCS theory, suggesting that the energy gap is isotropic and in a strong coupling state.