{"bundle_type":"pith_open_graph_bundle","bundle_version":"1.0","pith_number":"pith:2015:BECDKUDIBVYM467J32YIMFXNWQ","short_pith_number":"pith:BECDKUDI","canonical_record":{"source":{"id":"1508.06090","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"cond-mat.str-el","submitted_at":"2015-08-25T09:45:12Z","cross_cats_sorted":["cond-mat.mtrl-sci"],"title_canon_sha256":"cc476ccf41e41b44b1fb00684ce610a75584c57da1bf7d83f326e2688bd808ef","abstract_canon_sha256":"1ee1e003fa4918fca5e4bde35fdd8fdaa6100c1b811c564e070aed94a0e42f9f"},"schema_version":"1.0"},"canonical_sha256":"09043550680d70ce7be9deb08616edb42a12232591693e31b18360ec96c33190","source":{"kind":"arxiv","id":"1508.06090","version":1},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1508.06090","created_at":"2026-05-18T01:28:46Z"},{"alias_kind":"arxiv_version","alias_value":"1508.06090v1","created_at":"2026-05-18T01:28:46Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1508.06090","created_at":"2026-05-18T01:28:46Z"},{"alias_kind":"pith_short_12","alias_value":"BECDKUDIBVYM","created_at":"2026-05-18T12:29:14Z"},{"alias_kind":"pith_short_16","alias_value":"BECDKUDIBVYM467J","created_at":"2026-05-18T12:29:14Z"},{"alias_kind":"pith_short_8","alias_value":"BECDKUDI","created_at":"2026-05-18T12:29:14Z"}],"events":[{"event_type":"record_created","subject_pith_number":"pith:2015:BECDKUDIBVYM467J32YIMFXNWQ","target":"record","payload":{"canonical_record":{"source":{"id":"1508.06090","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"cond-mat.str-el","submitted_at":"2015-08-25T09:45:12Z","cross_cats_sorted":["cond-mat.mtrl-sci"],"title_canon_sha256":"cc476ccf41e41b44b1fb00684ce610a75584c57da1bf7d83f326e2688bd808ef","abstract_canon_sha256":"1ee1e003fa4918fca5e4bde35fdd8fdaa6100c1b811c564e070aed94a0e42f9f"},"schema_version":"1.0"},"canonical_sha256":"09043550680d70ce7be9deb08616edb42a12232591693e31b18360ec96c33190","receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-05-18T01:28:46.666431Z","signature_b64":"CCfHqPw7LS1vCCF1Z+5gwb1HEwNv5e1ZJZUp3vvISFcVDnwHgpNfXExOl4DjDvNJg4lK9NEOAyJrI9MYu1SpAA==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"09043550680d70ce7be9deb08616edb42a12232591693e31b18360ec96c33190","last_reissued_at":"2026-05-18T01:28:46.665791Z","signature_status":"signed_v1","first_computed_at":"2026-05-18T01:28:46.665791Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"source_kind":"arxiv","source_id":"1508.06090","source_version":1,"attestation_state":"computed"},"signer":{"signer_id":"pith.science","signer_type":"pith_registry","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"created_at":"2026-05-18T01:28:46Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"1Kl0igq9KKgA6lZMZoahSU7f1uVDK+6T8aah52vfV0QvkqVc/EgMj8cP5wl8PtUa6L3CDBQpxULhHnE38x1wDg==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-05-20T19:19:23.238477Z"},"content_sha256":"741ca9ec05e025bc5d4d47a74b5a0256781986296b4cfbf3fbd0d27dfdd531d5","schema_version":"1.0","event_id":"sha256:741ca9ec05e025bc5d4d47a74b5a0256781986296b4cfbf3fbd0d27dfdd531d5"},{"event_type":"graph_snapshot","subject_pith_number":"pith:2015:BECDKUDIBVYM467J32YIMFXNWQ","target":"graph","payload":{"graph_snapshot":{"paper":{"title":"Phonons in the multiferroic langasite Ba$\\_3$NbFe$\\_3$Si$\\_2$O$\\_{14}$ : evidences for symmetry breaking","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":["cond-mat.mtrl-sci"],"primary_cat":"cond-mat.str-el","authors_text":"C Toulouse (MPQ), F Levy-Bertrand (NEEL), H Barkaoui (NEEL), ILL), J. B. Brubach (SSOLEIL), L Chaix (ILL, M. B. Lepetit (NEEL, M Cazayous (MPQ), Neel), P Lejay (NEEL), P Roy (SSOLEIL), S De Brion (NEEL), SLAC","submitted_at":"2015-08-25T09:45:12Z","abstract_excerpt":"The chiral langasite Ba$\\_3$NbFe$\\_3$Si$\\_2$O$\\_{14}$ is a multiferroic compound. While its magnetic order below T$\\_N$=27 K is now well characterised, its polar order is still controversial. We thus looked at the phonon spectrum and its temperature dependence to unravel possible crystal symmetry breaking. We combined optical measurements (both infrared and Raman spectroscopy) with ab initio calculations and show that signatures of a polar state are clearly present in the phonon spectrum even at room temperature. An additional symmetry lowering occurs below 120~K as seen from emergence of soft"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1508.06090","kind":"arxiv","version":1},"verdict":{"id":null,"model_set":{},"created_at":null,"strongest_claim":"","one_line_summary":"","pipeline_version":null,"weakest_assumption":"","pith_extraction_headline":""},"references":{"count":0,"sample":[],"resolved_work":0,"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57","internal_anchors":0},"formal_canon":{"evidence_count":0,"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"author_claims":{"count":0,"strong_count":0,"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"builder_version":"pith-number-builder-2026-05-17-v1"},"verdict_id":null},"signer":{"signer_id":"pith.science","signer_type":"pith_registry","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"created_at":"2026-05-18T01:28:46Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"TXu4l+4I6Tvm+qcjHCFvX4QdTwpP6MbUcR+T53dXvx9jLf+j2ZET+0QksPrzdyxvUp9+E7mH1fbLORPy1kB4Cg==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-05-20T19:19:23.238827Z"},"content_sha256":"58c7e14575adf62d4384e17e16d65234c641c54d242102e22a218fe9ee4801ba","schema_version":"1.0","event_id":"sha256:58c7e14575adf62d4384e17e16d65234c641c54d242102e22a218fe9ee4801ba"}],"timestamp_proofs":[],"mirror_hints":[{"mirror_type":"https","name":"Pith Resolver","base_url":"https://pith.science","bundle_url":"https://pith.science/pith/BECDKUDIBVYM467J32YIMFXNWQ/bundle.json","state_url":"https://pith.science/pith/BECDKUDIBVYM467J32YIMFXNWQ/state.json","well_known_bundle_url":"https://pith.science/.well-known/pith/BECDKUDIBVYM467J32YIMFXNWQ/bundle.json","status":"primary"}],"public_keys":[{"key_id":"pith-v1-2026-05","algorithm":"ed25519","format":"raw","public_key_b64":"stVStoiQhXFxp4s2pdzPNoqVNBMojDU/fJ2db5S3CbM=","public_key_hex":"b2d552b68890857171a78b36a5dccf368a953413288c353f7c9d9d6f94b709b3","fingerprint_sha256_b32_first128bits":"RVFV5Z2OI2J3ZUO7ERDEBCYNKS","fingerprint_sha256_hex":"8d4b5ee74e4693bcd1df2446408b0d54","rotates_at":null,"url":"https://pith.science/pith-signing-key.json","notes":"Pith uses this Ed25519 key to sign canonical record SHA-256 digests. Verify with: ed25519_verify(public_key, message=canonical_sha256_bytes, signature=base64decode(signature_b64))."}],"merge_version":"pith-open-graph-merge-v1","built_at":"2026-05-20T19:19:23Z","links":{"resolver":"https://pith.science/pith/BECDKUDIBVYM467J32YIMFXNWQ","bundle":"https://pith.science/pith/BECDKUDIBVYM467J32YIMFXNWQ/bundle.json","state":"https://pith.science/pith/BECDKUDIBVYM467J32YIMFXNWQ/state.json","well_known_bundle":"https://pith.science/.well-known/pith/BECDKUDIBVYM467J32YIMFXNWQ/bundle.json"},"state":{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2015:BECDKUDIBVYM467J32YIMFXNWQ","merge_version":"pith-open-graph-merge-v1","event_count":2,"valid_event_count":2,"invalid_event_count":0,"equivocation_count":0,"current":{"canonical_record":{"metadata":{"abstract_canon_sha256":"1ee1e003fa4918fca5e4bde35fdd8fdaa6100c1b811c564e070aed94a0e42f9f","cross_cats_sorted":["cond-mat.mtrl-sci"],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"cond-mat.str-el","submitted_at":"2015-08-25T09:45:12Z","title_canon_sha256":"cc476ccf41e41b44b1fb00684ce610a75584c57da1bf7d83f326e2688bd808ef"},"schema_version":"1.0","source":{"id":"1508.06090","kind":"arxiv","version":1}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1508.06090","created_at":"2026-05-18T01:28:46Z"},{"alias_kind":"arxiv_version","alias_value":"1508.06090v1","created_at":"2026-05-18T01:28:46Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1508.06090","created_at":"2026-05-18T01:28:46Z"},{"alias_kind":"pith_short_12","alias_value":"BECDKUDIBVYM","created_at":"2026-05-18T12:29:14Z"},{"alias_kind":"pith_short_16","alias_value":"BECDKUDIBVYM467J","created_at":"2026-05-18T12:29:14Z"},{"alias_kind":"pith_short_8","alias_value":"BECDKUDI","created_at":"2026-05-18T12:29:14Z"}],"graph_snapshots":[{"event_id":"sha256:58c7e14575adf62d4384e17e16d65234c641c54d242102e22a218fe9ee4801ba","target":"graph","created_at":"2026-05-18T01:28:46Z","signer":{"key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signer_id":"pith.science","signer_type":"pith_registry"},"payload":{"graph_snapshot":{"author_claims":{"count":0,"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57","strong_count":0},"builder_version":"pith-number-builder-2026-05-17-v1","claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"formal_canon":{"evidence_count":0,"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"paper":{"abstract_excerpt":"The chiral langasite Ba$\\_3$NbFe$\\_3$Si$\\_2$O$\\_{14}$ is a multiferroic compound. While its magnetic order below T$\\_N$=27 K is now well characterised, its polar order is still controversial. We thus looked at the phonon spectrum and its temperature dependence to unravel possible crystal symmetry breaking. We combined optical measurements (both infrared and Raman spectroscopy) with ab initio calculations and show that signatures of a polar state are clearly present in the phonon spectrum even at room temperature. An additional symmetry lowering occurs below 120~K as seen from emergence of soft","authors_text":"C Toulouse (MPQ), F Levy-Bertrand (NEEL), H Barkaoui (NEEL), ILL), J. B. Brubach (SSOLEIL), L Chaix (ILL, M. B. Lepetit (NEEL, M Cazayous (MPQ), Neel), P Lejay (NEEL), P Roy (SSOLEIL), S De Brion (NEEL), SLAC","cross_cats":["cond-mat.mtrl-sci"],"headline":"","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"cond-mat.str-el","submitted_at":"2015-08-25T09:45:12Z","title":"Phonons in the multiferroic langasite Ba$\\_3$NbFe$\\_3$Si$\\_2$O$\\_{14}$ : evidences for symmetry breaking"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1508.06090","kind":"arxiv","version":1},"verdict":{"created_at":null,"id":null,"model_set":{},"one_line_summary":"","pipeline_version":null,"pith_extraction_headline":"","strongest_claim":"","weakest_assumption":""}},"verdict_id":null}}],"author_attestations":[],"timestamp_anchors":[],"storage_attestations":[],"citation_signatures":[],"replication_records":[],"corrections":[],"mirror_hints":[],"record_created":{"event_id":"sha256:741ca9ec05e025bc5d4d47a74b5a0256781986296b4cfbf3fbd0d27dfdd531d5","target":"record","created_at":"2026-05-18T01:28:46Z","signer":{"key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signer_id":"pith.science","signer_type":"pith_registry"},"payload":{"attestation_state":"computed","canonical_record":{"metadata":{"abstract_canon_sha256":"1ee1e003fa4918fca5e4bde35fdd8fdaa6100c1b811c564e070aed94a0e42f9f","cross_cats_sorted":["cond-mat.mtrl-sci"],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"cond-mat.str-el","submitted_at":"2015-08-25T09:45:12Z","title_canon_sha256":"cc476ccf41e41b44b1fb00684ce610a75584c57da1bf7d83f326e2688bd808ef"},"schema_version":"1.0","source":{"id":"1508.06090","kind":"arxiv","version":1}},"canonical_sha256":"09043550680d70ce7be9deb08616edb42a12232591693e31b18360ec96c33190","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"09043550680d70ce7be9deb08616edb42a12232591693e31b18360ec96c33190","first_computed_at":"2026-05-18T01:28:46.665791Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-05-18T01:28:46.665791Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"CCfHqPw7LS1vCCF1Z+5gwb1HEwNv5e1ZJZUp3vvISFcVDnwHgpNfXExOl4DjDvNJg4lK9NEOAyJrI9MYu1SpAA==","signature_status":"signed_v1","signed_at":"2026-05-18T01:28:46.666431Z","signed_message":"canonical_sha256_bytes"},"source_id":"1508.06090","source_kind":"arxiv","source_version":1}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:741ca9ec05e025bc5d4d47a74b5a0256781986296b4cfbf3fbd0d27dfdd531d5","sha256:58c7e14575adf62d4384e17e16d65234c641c54d242102e22a218fe9ee4801ba"],"state_sha256":"5be7504fc8c9c7816313c2c6477929fbff62b98d505161ade9571532c378ed42"},"bundle_signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"3TZ8FrOKSH/hlDOOkSs8zdEK+lFS4wgEJABacj0eWmFT1CMHDog86c1Pn9figxXWa/tVTjcHpE6Lkl6Z+WURCg==","signed_message":"bundle_sha256_bytes","signed_at":"2026-05-20T19:19:23.240794Z","bundle_sha256":"2dae1b8c4661323e897b2a8d027576318342755abf2f8c4294fe5a497ec183c3"}}