Superconducting Properties of the Non-Centrosymmetric Superconductor Re6Hf

Abstract

The synthesis and detailed characterization of the noncentrosymmetric superconductor Re${}_6$Hf using powder x-ray diffraction (XRD), magnetization, transport and thermodynamic measurements are reported. XRD confirms the crystal structure of Re${}_6$Hf to be cubic noncentrosymmetric $\alpha$-\textit{Mn} with a lattice parameter a = 9.6850(3)\textÅ. Resistivity, DC and AC magnetization confirms the bulk superconducting transition T${}_c^{onset}\sim$ ~ 5.96 K. The lower critical field H${}_{C1}(0)\approx$ 5.6 mT and upper critical H${}_{C2}(0)$ was found to be around 12.2 T which is greater than the Pauli limiting field, indicating unconventional behavior in Re${}_6$Hf and leads to the possibility of triplet pairing. A sharp discontinuity in the specific heat data was observed around T${}_c$ indicating bulk superconductivity, and the normalized specific heat jump is $\Delta C_{el}$/${\gamma }_n$T${}_c$ = 1.53 which is in close agreement with BCS value. Superconducting electronic specific heat data is fitted reasonably well for an exponential relation with Sommerfeld coefficient ($\gamma$) showing a linear relation with magnetic field suggesting that in Re${}_6$Hf dominant pairing channel is s-wave with isotropic superconducting gap parameter without nodes.

References in corpus (21)

• A Sharp Peak of the Zero-Temperature Penetration Depth at Optimal Composition in BaFe2(As1-xPx)2
• 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
• Unified explanation of the Kadowaki-Woods ratio in strongly correlated materials
• Electron Correlation and Pairing States in Superconductors without Inversion Symmetry
• Observation of Time-Reversal Symmetry Breaking in the Non-Centrosymmetric Superconductor Re6Zr
• Muon-spin rotation studies of SmFeAsO_0.85 and NdFeAsO_0.85 superconductors
• Physical properties of the noncentrosymmetric superconductor Mg_10Ir_19B_16
• Specific heat and $\mu$SR study on the noncentrosymmetric superconductor LaRhSi3
• Order parameter in superconductors with non-degenerate bands
• Multigap superconductivity in sesquicarbides La${}_2$C${}_3$ and Y${}_2$C${}_3$
• Time-reversal symmetry breaking in noncentrosymmetric superconductor Re6Hf:further evidence for unconventional behaviour in the alpha-Mn family of materials
• Superconductivity in Rh${}_2$Ga${}_9$ and Ir${}_2$Ga${}_9$ without Inversion Symmetry
• 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
• Emergent Nodal Excitations due to the Coexistence of Superconductivity and Antiferromagnetism: Cases with and without Inversion Symmetry
• Physical properties of noncentrosymmetric superconductor Ru${}_7$B${}_3$
• Complex superconductivity in the noncentrosymmetric compound Re${}_6$Zr
• Spin current in topologically trivial and nontrivial noncentrosymmetric superconductors
• Vortex avalanches in the non-centrosymmetric superconductor Li2Pt3B
• {Multiband Superconductivity in Lu${}_3$Os${}_4$Ge${}_{13}$
• Crystal growth and properties of the non-centrosymmetric superconductor, Ru7B3

Cited by in corpus (29)

• Superconductivity in a new hexagonal high entropy alloy
• Time-reversal symmetry breaking in Re-based superconductors
• Time-reversal symmetry breaking in noncentrosymmetric superconductor Re6Hf:further evidence for unconventional behaviour in the alpha-Mn family of materials
• Nodeless superconductivity and time-reversal symmetry breaking in the noncentrosymmetric superconductor Re24Ti5
• Time Reversal Symmetry Breaking in noncentrosymmetric superconductor Re6Ti
• Superconducting and normal-state properties of the noncentrosymmetric superconductor Re6Zr
• Superconducting and normal state properties of high entropy alloy Nb-Re-Hf-Zr-Tiinvestigated by muon spin relaxation and rotation
• muSR and Magnetometry Study of the Type-I Superconductor BeAu
• NbIr${}_2$B${}_2$ and TaIr${}_2$B${}_2$ -- new low symmetry noncentrosymmetric superconductors with strong spin orbit coupling
• Superconducting Properties and $\mu$SR Study of the Noncentrosymmetric Superconductor Nb${}_{0.5}$Os${}_{0.5}$
• Unconventional superconducting properties of noncentrosymmetric Re5.5Ta
• Time-reversal symmetry breaking in Re-based superconductors: Recent developments
• An investigation of type-I superconductivity in single crystal of Pb2Pd
• Probing the superconducting ground state of noncentrosymmetric high entropy alloys using muon-spin rotation and relaxation
• Superconducting properties of the noncentrosymmetric superconductor TaOs
• Fully gapped superconductivity in centrosymmetric and non-centrosymmetric Re-B compounds probed with $\mu$SR
• Evidence for the coexistence of time-reversal symmetry breaking and Bardeen-Cooper-Schrieffer-like superconductivity in La${}_7$Pd${}_3$
• Ir 5$d$-band Derived Superconductivity in LaIr${}_3$
• Nodeless superconductivity in noncentrosymmetric LaRhSn
• Nodeless superconductivity in the cage-type superconductor Sc5Ru6Sn18 with preserved time-reversal symmetry
• Superconducting properties and gap structure of the topological superconductor candidate Ti_(3)Sb
• Quantum muon diffusion and the preservation of time-reversal symmetry in the superconducting state of type-I rhenium
• Superconducting and structural properties of non-centrosymmetric Re6Hf superconductor under high pressure
• Superconducting Polycrystalline Rhenium Films Deposited at Room Temperature
• Superconductivity in amorphous and crystalline Re-Lu films
• Superconductivity with high upper critical field in Ta-Hf Alloys
• Physical properties of noncentrosymmetric tungsten and molybdenum aluminides
• A Family of Lanthanide Noncentrosymmetric Superconductors La${}_4$$TX$ ($T$ = Ru, Rh, Ir; $X$ = Al, In)
• NbReSi: A Noncentrosymetric Superconductor with Large Upper Critical Field