Superconducting and normal-state properties of the noncentrosymmetric superconductor Re6Zr

Abstract

We systematically investigate the normal and superconducting properties of non-centrosymmetric Re${}_6$Zr using magnetization, heat capacity, and electrical resistivity measurements. Resistivity measurements indicate Re${}_6$Zr has poor metallic behavior and is dominated by disorder. Re${}_6$Zr undergoes a superconducting transition at $T_{\mathrm{c}}=\left(6.75\pm 0.05\right)$ K. Magnetization measurements give a lower critical field, ${\mu }_0{H}_{c1}=\left(10.3\pm 0.1\right)$ mT. The Werthamer-Helfand-Hohenberg model is used to approximate the upper critical field ${\mu }_0{H}_{c2}=\left(11.2\pm 0.2\right)$ T which is close to the Pauli limiting field of 12.35 T and which could indicate singlet-triplet mixing. However, low-temperature specific-heat data suggest that Re${}_6$Zr is an isotropic, fully gapped s-wave superconductor with enhanced electron-phonon coupling. Unusual flux pinning resulting in a peak effect is observed in the magnetization data, indicating an unconventional vortex state.

11 pages, 7 figures, 2 tables

References in corpus (10)

• High Resolution Polar Kerr Effect Measurements of Sr2RuO4: Evidence for Broken Time Reversal Symmetry in the Superconducting State
• Evidence for time-reversal symmetry breaking in the non-centrosymmetric superconductor LaNiC${}_2$
• Spin Triplet Superconducting State due to Broken Inversion Symmetry in Li_2Pt_3B
• Dirac Surface States and Nature of Superconductivity in Noncentrosymmetric BiPd
• Physical properties of the noncentrosymmetric superconductor Mg_10Ir_19B_16
• Specific heat and $\mu$SR study on the noncentrosymmetric superconductor LaRhSi3
• Relativistic analysis of the pairing symmetry of the noncentrosymmetric superconductor LaNiC${}_2$
• Broken time-reversal symmetry probed by muon spin relaxation in the caged type superconductor Lu${}_5$Rh${}_6$Sn${}_{18}$
• Abrupt enhancement of non-centrosymmetry and appearance of the spin-triplet superconducting state in Li_2(Pd_{1-x}Pt_{x})_3B beyond x=0.8
• Full-gap superconductivity in non-centrosymmetric Re${}_6$Zr, Re${}_{27}$Zr${}_5$ and Re${}_{24}$Zr${}_5$

Cited by in corpus (10)

• Nodeless superconductivity and time-reversal symmetry breaking in the noncentrosymmetric superconductor Re24Ti5
• Study of the superconducting ground state of topological superconducting candidates Ti${}_3$X (X = Ir, Sb)
• Structure and superconductivity in the binary Re${}_{1-x}$Mo${}_x$ alloys
• Unconventional superconducting properties of noncentrosymmetric Re5.5Ta
• Investigations of the superconducting ground state of Zr${}_3$Ir: Introducing a new noncentrosymmetric superconductor
• Time-reversal symmetry breaking in Re-based superconductors: Recent developments
• Probing the superconducting ground state of noncentrosymmetric high entropy alloys using muon-spin rotation and relaxation
• Evidence for the coexistence of time-reversal symmetry breaking and Bardeen-Cooper-Schrieffer-like superconductivity in La${}_7$Pd${}_3$
• Superconducting properties of the noncentrosymmetric superconductor TaOs
• Superconducting ground state of nonsymmorphic superconducting compound Zr${}_2$Ir