eprintid: 10120248 rev_number: 18 eprint_status: archive userid: 608 dir: disk0/10/12/02/48 datestamp: 2021-02-02 17:54:00 lastmod: 2021-09-23 22:28:31 status_changed: 2021-02-02 17:54:00 type: article metadata_visibility: show creators_name: Wang, A creators_name: Nie, ZY creators_name: Du, F creators_name: Pang, GM creators_name: Kase, N creators_name: Akimitsu, J creators_name: Chen, Y creators_name: Gutmann, MJ creators_name: Adroja, DT creators_name: Perry, RS creators_name: Cao, C creators_name: Smidman, M creators_name: Yuan, HQ title: Nodeless superconductivity in Lu5-xRh6Sn18+x with broken time reversal symmetry ispublished: pub divisions: UCL divisions: B04 divisions: C06 divisions: F64 note: This version is the version of record. For information on re-use, please refer to the publisher’s terms and conditions. abstract: Evidence for broken time reversal symmetry (TRS) has been found in the superconducting states of the R 5 Rh 6 Sn 18 ( R = Sc , Y, Lu) compounds with a centrosymmetric caged crystal structure, but the origin of this phenomenon is unresolved. Here, we report neutron diffraction measurements of single crystals with R = Lu , as well as measurements of the temperature dependence of the magnetic penetration depth using a self-induced tunnel-diode-oscillator (TDO)-based technique, together with band structure calculations using density functional theory. Neutron diffraction measurements reveal that the system crystallizes in a tetragonal caged structure, and that one of the nominal Lu sites in the Lu 5 Rh 6 Sn 18 structure is occupied by Sn, yielding a composition Lu 5 − x Rh 6 Sn 18 + x ( x = 1 ). The low temperature penetration depth shift Δ λ ( T ) exhibits an exponential temperature dependence below around 0.3 T c , giving clear evidence for fully gapped superconductivity. The derived superfluid density is reasonably well accounted for by a single-gap s -wave model, whereas agreement cannot be found for models of TRS breaking states with two-component order parameters. Moreover, band structure calculations reveal multiple bands crossing the Fermi level, and indicate that the aforementioned TRS breaking states would be expected to have nodes on the Fermi surface, in contrast to the observations. date: 2021-01-01 date_type: published publisher: AMER PHYSICAL SOC official_url: https://doi.org/10.1103/PhysRevB.103.024503 oa_status: green full_text_type: pub language: eng primo: open primo_central: open_green verified: verified_manual elements_id: 1844221 doi: 10.1103/PhysRevB.103.024503 lyricists_name: Perry, Robin lyricists_id: RPERR46 actors_name: Perry, Robin actors_id: RPERR46 actors_role: owner full_text_status: public publication: Physical Review B volume: 103 number: 2 article_number: 024503 pages: 8 citation: Wang, A; Nie, ZY; Du, F; Pang, GM; Kase, N; Akimitsu, J; Chen, Y; ... Yuan, HQ; + view all <#> Wang, A; Nie, ZY; Du, F; Pang, GM; Kase, N; Akimitsu, J; Chen, Y; Gutmann, MJ; Adroja, DT; Perry, RS; Cao, C; Smidman, M; Yuan, HQ; - view fewer <#> (2021) Nodeless superconductivity in Lu5-xRh6Sn18+x with broken time reversal symmetry. Physical Review B , 103 (2) , Article 024503. 10.1103/PhysRevB.103.024503 <https://doi.org/10.1103/PhysRevB.103.024503>. Green open access document_url: https://discovery.ucl.ac.uk/id/eprint/10120248/1/PhysRevB.103.024503.pdf