Large upper critical field in non-centrosymmetric superconductor Y2C3

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Abstract

We determine the upper critical field \(\mu_0 H_{c2}(T_c)\) of non-centrosymmetric superconductor \(Y_2 C_3\) using two distinct methods: the bulk magnetization M(T) and the tunnel-diode oscillator (TDO) based impedance measurements. It is found that the upper critical field reaches a value of 30T at zero temperature which is above the weak-coupling Pauli paramagnetic limit. We argue that the observation of such a large \(\mu_0 H_{c2}(0)\) in \(Y_2 C_3\) could be attributed to the admixture of spin-singlet and spin-triplet pairing states as a result of broken inversion symmetry.

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Temperature and Purity Dependence of the Superconducting Critical Field,Hc2. III. Electron Spin and Spin-Orbit Effects

N. Werthamer, Arthur E Helfand, P Hohenberg (1966)

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Heavy fermion superconductivity and magnetic order in non-centrosymmetric \(CePt_3Si\)

Ch. Paul, H. Michor, E. Bauer … (2003)

\(\rm CePt_3Si\) is a novel heavy fermion superconductor, crystallising in the \(\rm CePt_3B\) structure as a tetragonally distorted low symmetry variant of the \(\rm AuCu_3\) structure type. \(\rm CePt_3Si\) exhibits antiferromagnetic order at \(T_N \approx 2.2\) K and enters into a heavy fermion superconducting state at \(T_c \approx 0.75\) K. Large values of \(H_{c2}' \approx -8.5\) T/K and \(H_{c2}(0) \approx 5\) T refer to heavy quasiparticles forming Cooper pairs. Hitherto, \(\rm CePt_3Si\) is the first heavy fermion superconductor without a center of symmetry.