Enhancement of Superconducting Transition Temperature due to the strong Antiferromagnetic Spin Fluctuations in Non-centrosymmetric Heavy-fermion Superconductor CeIrSi3 :A 29Si-NMR Study under Pressure

Abstract

We report a 29Si-NMR study on the pressure-induced superconductivity (SC) in an antiferromagnetic (AFM) heavy-fermion compound CeIrSi3 without inversion symmetry. In the SC state at P=2.7-2.8 GPa, the temperature dependence of the nuclear-spin lattice relaxation rate 1/T_1 below Tc exhibits a T^3 behavior without any coherence peak just below Tc, revealing the presence of line nodes in the SC gap. In the normal state, 1/T_1 follows a \sqrt{T}-like behavior, suggesting that the SC emerges under the non-Fermi liquid state dominated by AFM spin fluctuations enhanced around quantum critical point (QCP). The reason why the maximum Tc in CeIrSi3 is relatively high among the Ce-based heavy-fermion superconductors may be the existence of the strong AFM spin fluctuations. We discuss the comparison with the other Ce-based heavy-fermion superconductors.

4 pages, 5 figures, To be published in Phys. Rev. Lett

References in corpus (3)

• Non-centrosymmetric Superconductivity and Antiferromagnetic Order: Microscopic discussion of CePt${}_3$Si
• Emergent Nodal Excitations due to the Coexistence of Superconductivity and Antiferromagnetism: Cases with and without Inversion Symmetry
• Strong-Coupling Superconductivity of CeIrSi${}_3$ with the Non-centrosymmetric Crystal Structure

Cited by in corpus (49)

• Superconducting phases of f-electron compounds
• Superconductivity and spin-orbit coupling in non-centrosymmetric materials: a review
• Non-Abelian Topological Orders and Majorana Fermions in Spin-Singlet Superconductors
• Topological surface states in nodal superconductors
• Majorana Fermions in Nodal Superconductors: Gapless Topological Phase
• Time-reversal symmetry breaking in Re-based superconductors
• Multiple quantum phase transitions and superconductivity in Ce-based heavy fermions
• Nodeless superconductivity and time-reversal symmetry breaking in the noncentrosymmetric superconductor Re24Ti5
• Evidence of nodal gap structure in the non-centrosymmetric superconductor Y2C3
• Nuclear magnetic resonance in the heavy fermion superconductors
• Colossal enhancement of upper critical fields in noncentrosymmetric heavy fermion superconductors near quantum criticality: CeRhSi${}_3$ and CeIrSi${}_3$
• Multiband Superconductivity in Heavy Fermion Compound CePt3Si without Inversion Symmetry: An NMR Study on a High-Quality Single Crystal
• Edge currents as a signature of flat bands in topological superconductors
• Triplet Cooper Pair Formation by Anomalous Spin Fluctuations in Non-centrosymmetric Superconductors
• Anisotropic superconductivity in the noncentrosymmetric BiPd
• Spin Susceptibility of Noncentrosymmetric Heavy-fermion Superconductor CeIrSi3 under Pressure: 29Si-Knight Shift Study on Single Crystal
• muSR and Magnetometry Study of the Type-I Superconductor BeAu
• Type-I superconductivity in noncentrosymmetric superconductor AuBe
• Two-dimensional XY-type Magnetic Properties of Locally Noncentrosymmetric Superconductor CeRh${}_2$As${}_2$
• Microscopic Mechanism and Pairing Symmetry of Superconductivity in the Noncentrosymmetric Heavy Fermion Systems CeRhSI${}_3$ and CeIrSi${}_3$
• Spin fluctuations and superconductivity in noncentrosymmetric heavy fermion systems CeRhSi${}_3$ and CeIrSi${}_3$
• Probing the superconducting ground state of the noncentrosymmetric superconductors CaTSi3 (T = Ir, Pt) using muon-spin relaxation and rotation
• Structure and superconductivity in the binary Re${}_{1-x}$Mo${}_x$ alloys
• Stability of flat-band edge states in topological superconductors without inversion center
• Superconductivity and quantum criticality in heavy fermions CeIrSi${}_3$ and CeRhSi${}_3$
• $\mu$SR study of noncentrosymmetric superconductor PbTaSe${}_2$
• Fully gapped spin-singlet superconductivity in noncentrosymmetric PbTaSe${}_2$ : ${}^{207}$Pb-NMR
• Majorana vortex-bound states in three-dimensional nodal noncentrosymmetric superconductors
• Surface instability in nodal noncentrosymmetric superconductors
• Edge currents as a probe of the strongly spin-polarized topological noncentrosymmetric superconductors
• Superconductivity in noncentrosymmetric NbReSi investigated by muon spin rotation and relaxation
• Superconducting gap symmetry of the noncentrosymmetric superconductor W3Al2C
• Probing nodeless superconductivity in LaMSi (M = Ni, Pt) using muon-spin rotation and relaxation
• Strong antisymmetric spin-orbit coupling and superconducting properties: The case of noncentrosymmetric LaPtSi
• Coupled Wire Models of Interacting Dirac Nodal Superconductors
• Renormalized quasiparticles, topological monopoles and superconducting line nodes in heavy fermion CeTX${}_3$ compounds
• Conventional $s$-Wave Superconductivity in Noncentrosymmetric Ir${}_2$Ga${}_9$: ${}^{71}$Ga-NQR Evidence
• Antiferromagnetic spin fluctuations and superconductivity in NbRh${}_2$B${}_2$ and TaRh${}_2$B${}_2$ with a chiral crystal structure
• Nodeless superconductivity in the noncentrosymmetric Mo${}_3$Rh${}_2$N superconductor: a $\mu$SR study
• Large upper critical field in non-centrosymmetric superconductor Y2C3
• Structural and magnetic properties of CeZnAl${}_3$ single crystals
• Spectroscopic evidence of multi-gap superconductivity in non-centrosymmetric AuBe
• Non-Centrosymmetric Heavy-Fermion Superconductors
• On the size of superconducting islands on the density-wave background in organic metals
• Local atomic arrangement in LaCuAl3 and LaAuAl3 by NMR and density functional theory
• Supercurrent-Induced Weyl Superconductivity
• ${}^{181}$Ta Nuclear quadrupole resonance study of non-centrosymmetric superconductor PbTaSe${}_2$
• Anisotropic superconducting gap probed by ${}^{125}$Te NMR in noncentrosymmetric Sc${}_{6}M$Te${}_2$ ($M$ = Fe, Co)
• Majorana Fermions in Semiconducting Nanowires on the Top of Fulde-Ferrell Superconductor