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Pairing symmetry of an intermediate valence superconductor CeIr3 investigated using μSR measurements
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Adroja, D. T., Bhattacharyya, A., Sato, Y. J., Lees, Martin R., Biswas, P. K. (Pabitra K.), Panda, K., Anand, V. K., Stenning, Gavin B. G., Hillier, A. D. (Adrian D.) and Aoki, D. (2021) Pairing symmetry of an intermediate valence superconductor CeIr3 investigated using μSR measurements. Physical Review B, 103 (10). 104514. doi:10.1103/PhysRevB.103.104514 ISSN 2469-9950.
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Official URL: http://dx.doi.org/10.1103/PhysRevB.103.104514
Abstract
We have investigated the bulk and microscopic properties of the rhombohedral intermediate valence superconductor CeIr3 by employing magnetization, heat capacity, and muon spin rotation and relaxation (μSR) measurements. The magnetic susceptibility indicates bulk superconductivity below T_C = 3.1 K. Heat capacity data also reveal a bulk superconducting transition at 3.1 K with a second weak anomaly near 1.6 K. Zero-field μSR data show no strong evidence of broken time-reversal symmetry but support the presence of spin fluctuations below T_C. Transverse-field μSR measurements suggest a fully gapped, isotropic, s-wave superconductivity with 2Δ(0)/k_BT_C = 3.76(3), very close to 3.53, the Bardeen-Cooper-Schrieffer gap value for weak-coupling superconductors. From the temperature variation of the magnetic penetration depth, we have also determined the London penetration depth λ_L(0) = 435(2) nm, the carrier effective-mass enhancement m^∗ = 1.69(1)m_e, and the superconducting carrier density n_s = 2.5(1) × 10^27 carriers m^−3. The fact that LaIr3, with no 4 f electrons, and CeIr3 with 4f^n electrons where n ≤ 1 (Ce ion in a valence fluctuating state), both exhibit the same s-wave gap symmetry indicates that the Ir-d band governs the physics of these two compounds near the Fermi level, which is in agreement with previous band structure calculations.
| Item Type: | Journal Article | |||||||||||||||||||||
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| Subjects: | Q Science > QC Physics | |||||||||||||||||||||
| Divisions: | Faculty of Science, Engineering and Medicine > Science > Physics | |||||||||||||||||||||
| Library of Congress Subject Headings (LCSH): | Conduction electrons , Superconductors -- Magnetic properties , Superconductors -- Thermal properties , Muon spin rotation , Condensed matter | |||||||||||||||||||||
| Journal or Publication Title: | Physical Review B | |||||||||||||||||||||
| Publisher: | American Physical Society | |||||||||||||||||||||
| ISSN: | 2469-9950 | |||||||||||||||||||||
| Official Date: | 22 March 2021 | |||||||||||||||||||||
| Dates: |
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| Volume: | 103 | |||||||||||||||||||||
| Number: | 10 | |||||||||||||||||||||
| Article Number: | 104514 | |||||||||||||||||||||
| DOI: | 10.1103/PhysRevB.103.104514 | |||||||||||||||||||||
| Status: | Peer Reviewed | |||||||||||||||||||||
| Publication Status: | Published | |||||||||||||||||||||
| Access rights to Published version: | Restricted or Subscription Access | |||||||||||||||||||||
| Copyright Holders: | American Physical Society | |||||||||||||||||||||
| Date of first compliant deposit: | 23 March 2021 | |||||||||||||||||||||
| Date of first compliant Open Access: | 24 March 2021 | |||||||||||||||||||||
| RIOXX Funder/Project Grant: |
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