{"bundle_type":"pith_open_graph_bundle","bundle_version":"1.0","pith_number":"pith:2014:PTRD55WISG7YUMR2WSNSLD6C4P","short_pith_number":"pith:PTRD55WI","canonical_record":{"source":{"id":"1405.4610","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"cond-mat.mtrl-sci","submitted_at":"2014-05-19T05:57:20Z","cross_cats_sorted":[],"title_canon_sha256":"33d217471d2529b8ec5a4d59dae9cf1e12a764d737e5a76a537dbe4ab4092cf0","abstract_canon_sha256":"799782f9a1846dae5007ad1f5a9ea5d22df88e87a59d8e070d796f2042413a78"},"schema_version":"1.0"},"canonical_sha256":"7ce23ef6c891bf8a323ab49b258fc2e3c4a05033b6d995712f52005a49db5e53","source":{"kind":"arxiv","id":"1405.4610","version":1},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1405.4610","created_at":"2026-05-18T01:55:33Z"},{"alias_kind":"arxiv_version","alias_value":"1405.4610v1","created_at":"2026-05-18T01:55:33Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1405.4610","created_at":"2026-05-18T01:55:33Z"},{"alias_kind":"pith_short_12","alias_value":"PTRD55WISG7Y","created_at":"2026-05-18T12:28:43Z"},{"alias_kind":"pith_short_16","alias_value":"PTRD55WISG7YUMR2","created_at":"2026-05-18T12:28:43Z"},{"alias_kind":"pith_short_8","alias_value":"PTRD55WI","created_at":"2026-05-18T12:28:43Z"}],"events":[{"event_type":"record_created","subject_pith_number":"pith:2014:PTRD55WISG7YUMR2WSNSLD6C4P","target":"record","payload":{"canonical_record":{"source":{"id":"1405.4610","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"cond-mat.mtrl-sci","submitted_at":"2014-05-19T05:57:20Z","cross_cats_sorted":[],"title_canon_sha256":"33d217471d2529b8ec5a4d59dae9cf1e12a764d737e5a76a537dbe4ab4092cf0","abstract_canon_sha256":"799782f9a1846dae5007ad1f5a9ea5d22df88e87a59d8e070d796f2042413a78"},"schema_version":"1.0"},"canonical_sha256":"7ce23ef6c891bf8a323ab49b258fc2e3c4a05033b6d995712f52005a49db5e53","receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-05-18T01:55:33.876542Z","signature_b64":"Bzkd0JWuKKiQPwx5FucYqLsz+jXhKcoj4qXrV6NKOtMzxe8mtusgtyy12FSwsnN64eM1qrwWOj4LQYEkD99RCQ==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"7ce23ef6c891bf8a323ab49b258fc2e3c4a05033b6d995712f52005a49db5e53","last_reissued_at":"2026-05-18T01:55:33.875965Z","signature_status":"signed_v1","first_computed_at":"2026-05-18T01:55:33.875965Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"source_kind":"arxiv","source_id":"1405.4610","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":"2026-05-18T01:55:33Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"L4J0DJr0KNtN6qD+cvKmvxRtXWHrnos0MC46NLcxNzbcNg7PYrkbTvzR0mjoD6nGNg8Qb5qVmGZLcDDbbS18AA==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-05-23T21:07:04.082204Z"},"content_sha256":"f97014007c9bf81c8558b7747b8e3d11af979170cb5c0c239465dd0b097e0a67","schema_version":"1.0","event_id":"sha256:f97014007c9bf81c8558b7747b8e3d11af979170cb5c0c239465dd0b097e0a67"},{"event_type":"graph_snapshot","subject_pith_number":"pith:2014:PTRD55WISG7YUMR2WSNSLD6C4P","target":"graph","payload":{"graph_snapshot":{"paper":{"title":"Infrared phonon spectrum of the tetragonal helimagnet Ba$_2$CuGe$_2$O$_7$","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":[],"primary_cat":"cond-mat.mtrl-sci","authors_text":"A. Nucara, A. Vecchione, G. Balakhrisnan, J. Lorenzana, L. Baldassarre, P. Calvani, R. Fittipaldi, S. Koval, W. S. Mohamed","submitted_at":"2014-05-19T05:57:20Z","abstract_excerpt":"The lattice dynamics of Ba$_2$CuGe$_2$O$_7$, a compound which develops Dzyaloshinsky-Moriya (DM) helical magnetism below $T_N$ = 3.2 K, has been studied by measuring the infrared reflectivity of a single crystal with the radiation polarized both in the $ab$ plane and along the $c$ axis of its tetragonal cell, from 7 K to 300 K. In this compound, where the unit cell has no inversion symmetry, fourteen $E$ phonon modes of the $ab$ plane, out of the eighteen predicted, and all the ten $B_2$ modes of the $c$ axis, have been observed. They have been assigned to the atomic motions by a comparison wi"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1405.4610","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":"2026-05-18T01:55:33Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"CCn5pRDpQ3H5Boa5AYtT8533Op3giyADwMVX26Aj/cA5UlPGKU7e11PgATMx0u38U92bl9Y6CyWmnRgOEqf1Cw==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-05-23T21:07:04.082881Z"},"content_sha256":"0be5a9627131101e0da39f4a0098ac1b1080036b941c4f2cf3f3c11dce93c639","schema_version":"1.0","event_id":"sha256:0be5a9627131101e0da39f4a0098ac1b1080036b941c4f2cf3f3c11dce93c639"}],"timestamp_proofs":[],"mirror_hints":[{"mirror_type":"https","name":"Pith Resolver","base_url":"https://pith.science","bundle_url":"https://pith.science/pith/PTRD55WISG7YUMR2WSNSLD6C4P/bundle.json","state_url":"https://pith.science/pith/PTRD55WISG7YUMR2WSNSLD6C4P/state.json","well_known_bundle_url":"https://pith.science/.well-known/pith/PTRD55WISG7YUMR2WSNSLD6C4P/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":"2026-05-23T21:07:04Z","links":{"resolver":"https://pith.science/pith/PTRD55WISG7YUMR2WSNSLD6C4P","bundle":"https://pith.science/pith/PTRD55WISG7YUMR2WSNSLD6C4P/bundle.json","state":"https://pith.science/pith/PTRD55WISG7YUMR2WSNSLD6C4P/state.json","well_known_bundle":"https://pith.science/.well-known/pith/PTRD55WISG7YUMR2WSNSLD6C4P/bundle.json"},"state":{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2014:PTRD55WISG7YUMR2WSNSLD6C4P","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":"799782f9a1846dae5007ad1f5a9ea5d22df88e87a59d8e070d796f2042413a78","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"cond-mat.mtrl-sci","submitted_at":"2014-05-19T05:57:20Z","title_canon_sha256":"33d217471d2529b8ec5a4d59dae9cf1e12a764d737e5a76a537dbe4ab4092cf0"},"schema_version":"1.0","source":{"id":"1405.4610","kind":"arxiv","version":1}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1405.4610","created_at":"2026-05-18T01:55:33Z"},{"alias_kind":"arxiv_version","alias_value":"1405.4610v1","created_at":"2026-05-18T01:55:33Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1405.4610","created_at":"2026-05-18T01:55:33Z"},{"alias_kind":"pith_short_12","alias_value":"PTRD55WISG7Y","created_at":"2026-05-18T12:28:43Z"},{"alias_kind":"pith_short_16","alias_value":"PTRD55WISG7YUMR2","created_at":"2026-05-18T12:28:43Z"},{"alias_kind":"pith_short_8","alias_value":"PTRD55WI","created_at":"2026-05-18T12:28:43Z"}],"graph_snapshots":[{"event_id":"sha256:0be5a9627131101e0da39f4a0098ac1b1080036b941c4f2cf3f3c11dce93c639","target":"graph","created_at":"2026-05-18T01:55:33Z","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 lattice dynamics of Ba$_2$CuGe$_2$O$_7$, a compound which develops Dzyaloshinsky-Moriya (DM) helical magnetism below $T_N$ = 3.2 K, has been studied by measuring the infrared reflectivity of a single crystal with the radiation polarized both in the $ab$ plane and along the $c$ axis of its tetragonal cell, from 7 K to 300 K. In this compound, where the unit cell has no inversion symmetry, fourteen $E$ phonon modes of the $ab$ plane, out of the eighteen predicted, and all the ten $B_2$ modes of the $c$ axis, have been observed. They have been assigned to the atomic motions by a comparison wi","authors_text":"A. Nucara, A. Vecchione, G. Balakhrisnan, J. Lorenzana, L. Baldassarre, P. Calvani, R. Fittipaldi, S. Koval, W. S. Mohamed","cross_cats":[],"headline":"","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"cond-mat.mtrl-sci","submitted_at":"2014-05-19T05:57:20Z","title":"Infrared phonon spectrum of the tetragonal helimagnet Ba$_2$CuGe$_2$O$_7$"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1405.4610","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:f97014007c9bf81c8558b7747b8e3d11af979170cb5c0c239465dd0b097e0a67","target":"record","created_at":"2026-05-18T01:55:33Z","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":"799782f9a1846dae5007ad1f5a9ea5d22df88e87a59d8e070d796f2042413a78","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"cond-mat.mtrl-sci","submitted_at":"2014-05-19T05:57:20Z","title_canon_sha256":"33d217471d2529b8ec5a4d59dae9cf1e12a764d737e5a76a537dbe4ab4092cf0"},"schema_version":"1.0","source":{"id":"1405.4610","kind":"arxiv","version":1}},"canonical_sha256":"7ce23ef6c891bf8a323ab49b258fc2e3c4a05033b6d995712f52005a49db5e53","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"7ce23ef6c891bf8a323ab49b258fc2e3c4a05033b6d995712f52005a49db5e53","first_computed_at":"2026-05-18T01:55:33.875965Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-05-18T01:55:33.875965Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"Bzkd0JWuKKiQPwx5FucYqLsz+jXhKcoj4qXrV6NKOtMzxe8mtusgtyy12FSwsnN64eM1qrwWOj4LQYEkD99RCQ==","signature_status":"signed_v1","signed_at":"2026-05-18T01:55:33.876542Z","signed_message":"canonical_sha256_bytes"},"source_id":"1405.4610","source_kind":"arxiv","source_version":1}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:f97014007c9bf81c8558b7747b8e3d11af979170cb5c0c239465dd0b097e0a67","sha256:0be5a9627131101e0da39f4a0098ac1b1080036b941c4f2cf3f3c11dce93c639"],"state_sha256":"023053def629bc2671ecf417123dfcb3ff0eebe6df7fb9f090e551ee29572c45"},"bundle_signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"whojzjFMilDdVKcc8W6/+RG6Ez8VwIyOcKbPp6BOrW56blW4ZdWyCEiV11343Hn0XObi5OT2Yq7JcTq2EjWBBg==","signed_message":"bundle_sha256_bytes","signed_at":"2026-05-23T21:07:04.087050Z","bundle_sha256":"65d9ad70cd93d66b4fefe09c5e7939c94eaf9176e0c89a66b1440f0a806e7755"}}