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Non-centrosymmetric superconductivity in d-electron compounds

30/04/2013, Gaku Eguchi (Department of Systems Innovation, Graduate School of Engineering Science, Osaka University, Japan)

 

Superconducting state in a non-centrosymmetric crystal is understood as a spin singlet-triplet mixed state[1]. The novel superconducting state is realized due to the presence of finite antisymmetric spin-orbit interaction, which exhibits an electronic momentum-dependent effective Zeeman splitting.
We recently investigated d-electron-based non-magnetic superconductors CaIrSi3 and Li2(Pd1-xPtx)3B. We succeeded in growing single crystalline CaIrSi3. The compound is appropriate to investigate the novel superconducting state since its electronic state exhibits the strong Rashba-type spin-orbit splitting [2]. Li2(Pd1-xPtx)3B is known to exhibit spin-triplet dominant state for x>0.8[3]. Our recent specific heat study as a function of x revealed the presence of phonon anomaly, which seems to be related to the spin-triplet pairing [4].

In this seminar, I present the details of these compounds with our new data, and discuss what is necessary to realize the spin-triplet dominant state.

 

[1] M. Sigrist et al., J. Magn. Magn. Mater. 310, 536 (2007).
[2] G. Eguchi et al., Phys. Rev. B 86, 184510 (2012).
[3] S. Harada et al., Phys. Rev. B 86, 220502(R) (2012).

[4] G. Eguchi et al., accepted for publication in Phys. Rev. B (2013).