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Here, we demonstrate that\n                    <jats:italic>T<\/jats:italic>\n                    RuSi materials (with\n                    <jats:italic>T<\/jats:italic>\n                    a transition metal) belong to this class. Their bulk normal states behave as three-dimensional Kramers nodal-line semimetals, characterized by large antisymmetric spin-orbit couplings and by hourglass-like dispersions. Our muon-spin spectroscopy measurements show that certain\n                    <jats:italic>T<\/jats:italic>\n                    RuSi compounds spontaneously break the time-reversal symmetry at the superconducting transition, while unexpectedly showing a fully gapped superconductivity. Their unconventional behavior is consistent with a unitary (\n                    <jats:italic>s<\/jats:italic>\n                    +\n                    <jats:italic>ip<\/jats:italic>\n                    ) pairing, reflecting a mixture of spin singlets and spin triplets. By combining an intrinsic time-reversal symmetry-breaking superconductivity with nontrivial electronic bands,\n                    <jats:italic>T<\/jats:italic>\n                    RuSi compounds provide an ideal platform for investigating the rich interplay between unconventional superconductivity and the exotic properties of Kramers nodal-line\/hourglass fermions.\n                  <\/jats:p>","DOI":"10.1126\/sciadv.abq6589","type":"journal-article","created":{"date-parts":[[2022,10,28]],"date-time":"2022-10-28T13:58:35Z","timestamp":1666965515000},"source":"Crossref","is-referenced-by-count":34,"title":["Unconventional superconductivity in topological Kramers nodal-line semimetals"],"prefix":"10.1126","volume":"8","author":[{"ORCID":"https:\/\/orcid.org\/0000-0002-5916-0020","authenticated-orcid":true,"given":"Tian","family":"Shang","sequence":"first","affiliation":[{"name":"Key Laboratory of Polar Materials and Devices (MOE), School of Physics and Electronic Science, East China 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