Time reversal symmetry breaking and s-wave superconductivity in CaPd2Ge2: A $\mu$SR study

Abstract

$\mathrm{CaP}{\mathrm{d}}_2\mathrm{G}{\mathrm{e}}_2$ which crystallizes in $\mathrm{ThC}{\mathrm{r}}_2\mathrm{S}{\mathrm{i}}_2$-type body-centered tetragonal structure exhibits superconductivity below the critical temperature $T_{\mathrm{c}}=1.69$~K\@. We have investigated the superconducting gap structure and time reversal symmetry of the ground state in $\mathrm{CaP}{\mathrm{d}}_2\mathrm{G}{\mathrm{e}}_2$ by means of muon spin relaxation and rotation ($\mu$SR) measurements. Our analysis of $\mu$SR data collected in transverse magnetic field reveals BCS superconductivity with a single-band $s$-wave singlet pairing and an isotropic energy gap having the value $2\Delta (0)/k_{\mathrm{B}}{T}_{\mathrm{c}}=3.50(1)$. Further, an increased relaxation rate in zero field $\mu$SR asymmetry spectra below $T_{\mathrm{c}}$ provides evidence for the presence of a spontaneous magnetic field in the superconducting state revealing that the time-reversal symmetry is broken in $\mathrm{CaP}{\mathrm{d}}_2\mathrm{G}{\mathrm{e}}_2$.

arXiv comment8 pages, 5 figures

References in corpus (30)

• The Puzzle of High Temperature Superconductivity in Layered Iron Pnictides and Chalcogenides
• Superconductivity in Iron Compounds
• Time-Reversal Symmetry Breaking Superconductivity in Sr2RuO4
• Magnetic Penetration Depth in Unconventional Superconductors
• Properties of the Ideal Ginzburg-Landau Vortex Lattice
• Evidence for time-reversal symmetry breaking in the non-centrosymmetric superconductor LaNiC${}_2$
• Evidence for Time-Reversal-Symmetry-Broken Superconductivity in Locally Noncentrosymmetric SrPtAs
• Split superconducting and time-reversal symmetry-breaking transitions, and magnetic order in Sr${}_2$RuO${}_4$ under uniaxial stress
• Elaboration of the alpha-Model Derived from the BCS Theory of Superconductivity
• Recent progress on superconductors with time-reversal symmetry breaking
• Superconducting and Normal State Properties of APd2As2 (A = Ca, Sr, Ba) Single Crystals
• Broken time-reversal symmetry probed by muon spin relaxation in the caged type superconductor Lu${}_5$Rh${}_6$Sn${}_{18}$
• Physical properties of noncentrosymmetric superconductor LaIrSi3: A μSR study
• Time-reversal-symmetry breaking and unconventional pairing in the noncentrosymmetric superconductor La${}_7$Rh${}_3$
• Time-reversal symmetry breaking in the noncentrosymmetric Zr${}_3$Ir superconductor
• Evidence of Nodal Line in the Superconducting Gap Symmetry of Noncentrosymmetric ThCoC${}_2$
• Unconventional superconductivity in the cage type compound Sc${}_5$Rh${}_6$Sn${}_{18}$
• Time-Reversal-Symmetry-Broken State in the BCS Formalism for a Multi-Band Superconductor
• Probing the superconducting ground state of ZrIrSi: A $\mu$SR study
• Quantum Fluctuations in the Non-Fermi Liquid System CeCo${}_2$Ga${}_8$ Investigated Using $\mu$SR
• Superconductivity and Physical Properties of CaPd2Ge2 Single Crystals
• Pairing symmetry of an intermediate valence superconductor CeIr3 investigated using muSR measurements
• Investigation of Superconducting Gap Structure in HfIrSi using muon spin relaxation/rotation
• Unconventional bulk superconductivity in YFe${}_2$Ge${}_2$ single crystals
• Time-reversal symmetry breaking in superconductors through loop super-current order
• Evidence for the coexistence of time-reversal symmetry breaking and Bardeen-Cooper-Schrieffer-like superconductivity in La${}_7$Pd${}_3$
• Electron-phonon superconductivity in C-doped topological nodal-line semimetal Zr${}_5$Pt${}_3$: A muon spin rotation and relaxation ($\mu$SR) study
• Time-reversal-symmetry Breaking in the Superconducting State of ScS
• Fermi surface and mass renormalization in the iron-based superconductor YFe${}_2$Ge${}_2$
• Nodeless time-reversal symmetry breaking in the centrosymmetric superconductor Sc${}_5$Co${}_4$Si${}_{10}$ probed by muon-spin spectroscopy

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