Superconductivity in the noncentrosymetric Li2Pd(3-x)AgxB 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 c . The upper critical field at zero temperature was determined with Werthamer–Helfand equation, 𝜇 0 H WHH c2 ( 0 ) , and 𝜇 0 H linear c2 ( 0 ) and the coherence length, 𝜉 ( 0 ) . The value of 𝜇 0 H linear c2 ( 0 ) and 𝜇 0 H WHHc2 ( 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, 𝛾 , the electronic density of states at the Fermi level, N ( E F ) and the Debye temperature, 𝜃 D . In the superconducting state, the obtained values were; Δ C ∕ 𝛾 T c , the electron phonon coupling, 𝜆 e − ph , the superconducting energy gap, 2 Δ 0 , and the ratio 2 Δ 0 ∕ k B T 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.