Superconductivity in the noncentrosymmetric $$\hbox {Li}_2\hbox {Pd}_3-x\hbox {Ag}_x\hbox {B}$$ 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_{{ ext{c}}}). The upper critical field at zero temperature was determined with Werthamer–Helfand equation, (mu _0H ^{m WHH}_{ ext{c2}}(0)), and (mu _0H ^{m linear}_{ ext{c2}}(0)) and the coherence length, (xi (0)). The value of (mu _0H ^{m linear}_{ ext{c2}}(0)) and (mu _0H ^{m WHH}_{ ext{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_{ ext{F}})) and the Debye temperature, ( heta _{m D}). In the superconducting state, the obtained values were; (Delta C/gamma T_{{ ext{c}}}), the electron phonon coupling, (lambda _{m e-ph}), the superconducting energy gap, (2Delta _0), and the ratio (2Delta _0 /k _{m B} T_{{ ext{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.