Probing the superconducting ground state of the rare-earth ternary boride superconductors RRuB2 ( R= Lu,Y) using muon-spin rotation and relaxation
| Autor: | D. McK. Paul, J. A. T. Barker, Adrian D. Hillier, Ravi Pratap Singh |
|---|---|
| Rok vydání: | 2018 |
| Předmět: |
Superconductivity
Physics Condensed matter physics Rare earth 02 engineering and technology Muon spin spectroscopy 021001 nanoscience & nanotechnology 01 natural sciences chemistry.chemical_compound Zero field chemistry Condensed Matter::Superconductivity Lattice (order) Boride 0103 physical sciences 010306 general physics 0210 nano-technology Ground state Ternary operation |
| Zdroj: | Physical Review B. 97 |
| ISSN: | 2469-9969 2469-9950 |
| DOI: | 10.1103/physrevb.97.094506 |
| Popis: | The superconductivity in the rare-earth transition-metal ternary borides $R{\mathrm{RuB}}_{2}$ (where $R=\text{Lu}$ and Y) has been investigated using muon-spin rotation and relaxation. Measurements made in zero field suggest that time-reversal symmetry is preserved upon entering the superconducting state in both materials; a small difference in depolarization is observed above and below the superconducting transition in both compounds, however, this has been attributed to quasistatic magnetic fluctuations. Transverse-field measurements of the flux-line lattice indicate that the superconductivity in both materials is fully gapped, with a conventional $s$-wave pairing symmetry and BCS-like magnitudes for the zero-temperature gap energies. The electronic properties of the charge carriers in the superconducting state have been calculated, with effective masses ${m}^{*}/{m}_{\mathrm{e}}=9.8\ifmmode\pm\else\textpm\fi{}0.1$ and $15.0\ifmmode\pm\else\textpm\fi{}0.1$ in the Lu and Y compounds, respectively, with superconducting carrier densities ${n}_{\mathrm{s}}=(2.73\ifmmode\pm\else\textpm\fi{}0.04)\ifmmode\times\else\texttimes\fi{}{10}^{28}\phantom{\rule{0.28em}{0ex}}{\mathrm{m}}^{\ensuremath{-}3}$ and $(2.17\ifmmode\pm\else\textpm\fi{}0.02)\ifmmode\times\else\texttimes\fi{}{10}^{28}\phantom{\rule{0.28em}{0ex}}{\mathrm{m}}^{\ensuremath{-}3}$. The materials have been classified according to the Uemura scheme for superconductivity, with values for ${T}_{\mathrm{c}}/{T}_{\mathrm{F}}$ of $1/(414\ifmmode\pm\else\textpm\fi{}6)$ and $1/(304\ifmmode\pm\else\textpm\fi{}3)$, implying that the superconductivity may not be entirely conventional in nature. |
| Databáze: | OpenAIRE |
| Externí odkaz: |
|