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Ta$_4$Rh$_2$C$_{1-\\delta}$ crystallizes in the $\\eta$-carbide structure type, in the cubic space group $Fd\\bar{3}m$ (No.227) with a unit cell parameter of $a = $ 11.7947 \\AA. Temperature-dependent magnetic susceptibility, resistivity, and specific heat capacity measurements reveal that Ta$_4$Rh$_2$C$_{1-\\delta}$ is a type-II bulk superconductor with a critical temperature of $T_{\\rm c}$ = 6.4 K, and a normalized specific heat jump $\\Delta C/\\gamma T_{\\rm c}$ = 1.56. Notably, we find T"},"verification_status":{"content_addressed":true,"pith_receipt":true,"author_attested":false,"weak_author_claims":0,"strong_author_claims":0,"externally_anchored":false,"storage_verified":false,"citation_signatures":0,"replication_records":0,"graph_snapshot":true,"references_resolved":false,"formal_links_present":false},"canonical_record":{"source":{"id":"2506.02209","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"cond-mat.supr-con","submitted_at":"2025-06-02T19:48:54Z","cross_cats_sorted":[],"title_canon_sha256":"1da083416e3164bcb65a659946c142706c461fb19a3fa751a245d894a16f31f4","abstract_canon_sha256":"f1f10eba8e79f8d528055ccf747ac55a15a61401f274c5d1a4e6911fb64b7dc9"},"schema_version":"1.0"},"receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-07-05T11:14:34.433221Z","signature_b64":"/uiCOVH/GKOsTDnf2722oNS6n0O1P2cNL0cEfSp8682H+4+uZWskg10OSjLkMOm09GR6VDprOf+Izx1SEkxaDQ==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"707b0037dca4d7cf92a7ab1c71870870b2f31af2575f7cb9a78883230289128f","last_reissued_at":"2026-07-05T11:14:34.432639Z","signature_status":"signed_v1","first_computed_at":"2026-07-05T11:14:34.432639Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"graph_snapshot":{"paper":{"title":"Discovery of the Type-II Superconductor Ta$_4$Rh$_2$C$_{1-\\delta}$ with a High Upper Critical Field","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":[],"primary_cat":"cond-mat.supr-con","authors_text":"Fabian O. von Rohr, Harald O. Jeschke, Karolina Gornicka, Keyuan Ma, Sara L\\'opez-Paz, Tomasz Klimczuk","submitted_at":"2025-06-02T19:48:54Z","abstract_excerpt":"We report on the discovery of superconductivity in the previously unknown compound Ta$_4$Rh$_2$C$_{1-\\delta}$. Ta$_4$Rh$_2$C$_{1-\\delta}$ crystallizes in the $\\eta$-carbide structure type, in the cubic space group $Fd\\bar{3}m$ (No.227) with a unit cell parameter of $a = $ 11.7947 \\AA. Temperature-dependent magnetic susceptibility, resistivity, and specific heat capacity measurements reveal that Ta$_4$Rh$_2$C$_{1-\\delta}$ is a type-II bulk superconductor with a critical temperature of $T_{\\rm c}$ = 6.4 K, and a normalized specific heat jump $\\Delta C/\\gamma T_{\\rm c}$ = 1.56. 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