{"bundle_type":"pith_open_graph_bundle","bundle_version":"1.0","pith_number":"pith:2006:MNHOXPOQD6Q6N5FPZGNS6LNT5B","short_pith_number":"pith:MNHOXPOQ","canonical_record":{"source":{"id":"cond-mat/0606538","kind":"arxiv","version":1},"metadata":{"license":"","primary_cat":"cond-mat.supr-con","submitted_at":"2006-06-21T00:05:31Z","cross_cats_sorted":["cond-mat.mtrl-sci"],"title_canon_sha256":"aa28121133f489c77e3026395b62631a200fa5716097f1d58c9a9db40f1e56a4","abstract_canon_sha256":"a56183174b4ebeb848aee79cd68cfa7ae9922ee78d5d631860ab38e379ae078c"},"schema_version":"1.0"},"canonical_sha256":"634eebbdd01fa1e6f4afc99b2f2db3e86eee77fb81a38c2aaffcadc94ab11959","source":{"kind":"arxiv","id":"cond-mat/0606538","version":1},"source_aliases":[{"alias_kind":"arxiv","alias_value":"cond-mat/0606538","created_at":"2026-07-04T14:54:54Z"},{"alias_kind":"arxiv_version","alias_value":"cond-mat/0606538v1","created_at":"2026-07-04T14:54:54Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.cond-mat/0606538","created_at":"2026-07-04T14:54:54Z"},{"alias_kind":"pith_short_12","alias_value":"MNHOXPOQD6Q6","created_at":"2026-07-04T14:54:54Z"},{"alias_kind":"pith_short_16","alias_value":"MNHOXPOQD6Q6N5FP","created_at":"2026-07-04T14:54:54Z"},{"alias_kind":"pith_short_8","alias_value":"MNHOXPOQ","created_at":"2026-07-04T14:54:54Z"}],"events":[{"event_type":"record_created","subject_pith_number":"pith:2006:MNHOXPOQD6Q6N5FPZGNS6LNT5B","target":"record","payload":{"canonical_record":{"source":{"id":"cond-mat/0606538","kind":"arxiv","version":1},"metadata":{"license":"","primary_cat":"cond-mat.supr-con","submitted_at":"2006-06-21T00:05:31Z","cross_cats_sorted":["cond-mat.mtrl-sci"],"title_canon_sha256":"aa28121133f489c77e3026395b62631a200fa5716097f1d58c9a9db40f1e56a4","abstract_canon_sha256":"a56183174b4ebeb848aee79cd68cfa7ae9922ee78d5d631860ab38e379ae078c"},"schema_version":"1.0"},"canonical_sha256":"634eebbdd01fa1e6f4afc99b2f2db3e86eee77fb81a38c2aaffcadc94ab11959","receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-07-04T14:54:54.112983Z","signature_b64":"RkQw0sd0iEvcYlPddE95zRvjb3z+jAd0B9uU9allCziho6q1+UzbD63AG9db+1Mi5rQu06aLAqYsB9WxcEQCBA==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"634eebbdd01fa1e6f4afc99b2f2db3e86eee77fb81a38c2aaffcadc94ab11959","last_reissued_at":"2026-07-04T14:54:54.112583Z","signature_status":"signed_v1","first_computed_at":"2026-07-04T14:54:54.112583Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"source_kind":"arxiv","source_id":"cond-mat/0606538","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":"2026-07-04T14:54:54Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"1e8M6NrN+7H04bFqcALEwYccdBniQMyQK0ZxYo/hooNuJv3m1k0PGMBcoPpAEkltS49KXVEsBOe5A0kyRa9eDQ==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-07-07T05:29:03.786263Z"},"content_sha256":"f73033b4297622d622d31f1f51e80606d8f1e93287e351e56b809ef9866a06be","schema_version":"1.0","event_id":"sha256:f73033b4297622d622d31f1f51e80606d8f1e93287e351e56b809ef9866a06be"},{"event_type":"graph_snapshot","subject_pith_number":"pith:2006:MNHOXPOQD6Q6N5FPZGNS6LNT5B","target":"graph","payload":{"graph_snapshot":{"paper":{"title":"Strong Electron-Phonon Coupling in Yttrium under Pressure","license":"","headline":"","cross_cats":["cond-mat.mtrl-sci"],"primary_cat":"cond-mat.supr-con","authors_text":"S. Y. Savrasov, W. E. Pickett, Z. P. Yin","submitted_at":"2006-06-21T00:05:31Z","abstract_excerpt":"Linear response methods are applied to identify the increase in electron-phonon coupling in elemental yttrium that is responsible for its high superconducting critical temperature Tc, which reaches nearly 20 K at 115 GPa. While the evolution of the band structure and density of states is smooth and seemingly modest, there is strong increase in the 4d content of the occupied conduction states under pressure. We find that the transverse mode near the L point of the fcc Brillouin zone, already soft at ambient pressure, becomes unstable (in harmonic approximation) at a relative volume V/Vo=0.60 (P"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"cond-mat/0606538","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":""},"integrity":{"clean":true,"summary":{"advisory":0,"critical":0,"by_detector":{},"informational":0},"endpoint":"/pith/cond-mat/0606538/integrity.json","findings":[],"available":true,"detectors_run":[],"snapshot_sha256":"c28c3603d3b5d939e8dc4c7e95fa8dfce3d595e45f758748cecf8e644a296938"},"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":"2026-07-04T14:54:54Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"UrlmdidR+QuW9hQ0WMj24ZJEwBSXPY3hKtKrwVorBhB7/0WzPXD9kALMk09JpKn5zU0xbzMoZsNeZoW1lALFDQ==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-07-07T05:29:03.786649Z"},"content_sha256":"24840ff3f69f9a642568153c0a9071d11e0593d1e6e8b56b048b4767675bab24","schema_version":"1.0","event_id":"sha256:24840ff3f69f9a642568153c0a9071d11e0593d1e6e8b56b048b4767675bab24"}],"timestamp_proofs":[],"mirror_hints":[{"mirror_type":"https","name":"Pith Resolver","base_url":"https://pith.science","bundle_url":"https://pith.science/pith/MNHOXPOQD6Q6N5FPZGNS6LNT5B/bundle.json","state_url":"https://pith.science/pith/MNHOXPOQD6Q6N5FPZGNS6LNT5B/state.json","well_known_bundle_url":"https://pith.science/.well-known/pith/MNHOXPOQD6Q6N5FPZGNS6LNT5B/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":"2026-07-07T05:29:03Z","links":{"resolver":"https://pith.science/pith/MNHOXPOQD6Q6N5FPZGNS6LNT5B","bundle":"https://pith.science/pith/MNHOXPOQD6Q6N5FPZGNS6LNT5B/bundle.json","state":"https://pith.science/pith/MNHOXPOQD6Q6N5FPZGNS6LNT5B/state.json","well_known_bundle":"https://pith.science/.well-known/pith/MNHOXPOQD6Q6N5FPZGNS6LNT5B/bundle.json"},"state":{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2006:MNHOXPOQD6Q6N5FPZGNS6LNT5B","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":"a56183174b4ebeb848aee79cd68cfa7ae9922ee78d5d631860ab38e379ae078c","cross_cats_sorted":["cond-mat.mtrl-sci"],"license":"","primary_cat":"cond-mat.supr-con","submitted_at":"2006-06-21T00:05:31Z","title_canon_sha256":"aa28121133f489c77e3026395b62631a200fa5716097f1d58c9a9db40f1e56a4"},"schema_version":"1.0","source":{"id":"cond-mat/0606538","kind":"arxiv","version":1}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"cond-mat/0606538","created_at":"2026-07-04T14:54:54Z"},{"alias_kind":"arxiv_version","alias_value":"cond-mat/0606538v1","created_at":"2026-07-04T14:54:54Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.cond-mat/0606538","created_at":"2026-07-04T14:54:54Z"},{"alias_kind":"pith_short_12","alias_value":"MNHOXPOQD6Q6","created_at":"2026-07-04T14:54:54Z"},{"alias_kind":"pith_short_16","alias_value":"MNHOXPOQD6Q6N5FP","created_at":"2026-07-04T14:54:54Z"},{"alias_kind":"pith_short_8","alias_value":"MNHOXPOQ","created_at":"2026-07-04T14:54:54Z"}],"graph_snapshots":[{"event_id":"sha256:24840ff3f69f9a642568153c0a9071d11e0593d1e6e8b56b048b4767675bab24","target":"graph","created_at":"2026-07-04T14:54:54Z","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"},"integrity":{"available":true,"clean":true,"detectors_run":[],"endpoint":"/pith/cond-mat/0606538/integrity.json","findings":[],"snapshot_sha256":"c28c3603d3b5d939e8dc4c7e95fa8dfce3d595e45f758748cecf8e644a296938","summary":{"advisory":0,"by_detector":{},"critical":0,"informational":0}},"paper":{"abstract_excerpt":"Linear response methods are applied to identify the increase in electron-phonon coupling in elemental yttrium that is responsible for its high superconducting critical temperature Tc, which reaches nearly 20 K at 115 GPa. While the evolution of the band structure and density of states is smooth and seemingly modest, there is strong increase in the 4d content of the occupied conduction states under pressure. We find that the transverse mode near the L point of the fcc Brillouin zone, already soft at ambient pressure, becomes unstable (in harmonic approximation) at a relative volume V/Vo=0.60 (P","authors_text":"S. Y. Savrasov, W. E. Pickett, Z. P. Yin","cross_cats":["cond-mat.mtrl-sci"],"headline":"","license":"","primary_cat":"cond-mat.supr-con","submitted_at":"2006-06-21T00:05:31Z","title":"Strong Electron-Phonon Coupling in Yttrium under Pressure"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"cond-mat/0606538","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:f73033b4297622d622d31f1f51e80606d8f1e93287e351e56b809ef9866a06be","target":"record","created_at":"2026-07-04T14:54:54Z","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":"a56183174b4ebeb848aee79cd68cfa7ae9922ee78d5d631860ab38e379ae078c","cross_cats_sorted":["cond-mat.mtrl-sci"],"license":"","primary_cat":"cond-mat.supr-con","submitted_at":"2006-06-21T00:05:31Z","title_canon_sha256":"aa28121133f489c77e3026395b62631a200fa5716097f1d58c9a9db40f1e56a4"},"schema_version":"1.0","source":{"id":"cond-mat/0606538","kind":"arxiv","version":1}},"canonical_sha256":"634eebbdd01fa1e6f4afc99b2f2db3e86eee77fb81a38c2aaffcadc94ab11959","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"634eebbdd01fa1e6f4afc99b2f2db3e86eee77fb81a38c2aaffcadc94ab11959","first_computed_at":"2026-07-04T14:54:54.112583Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-07-04T14:54:54.112583Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"RkQw0sd0iEvcYlPddE95zRvjb3z+jAd0B9uU9allCziho6q1+UzbD63AG9db+1Mi5rQu06aLAqYsB9WxcEQCBA==","signature_status":"signed_v1","signed_at":"2026-07-04T14:54:54.112983Z","signed_message":"canonical_sha256_bytes"},"source_id":"cond-mat/0606538","source_kind":"arxiv","source_version":1}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:f73033b4297622d622d31f1f51e80606d8f1e93287e351e56b809ef9866a06be","sha256:24840ff3f69f9a642568153c0a9071d11e0593d1e6e8b56b048b4767675bab24"],"state_sha256":"d54908d08227b6842974c53242b31354be2386505b4e24beec25fe34f82687c8"},"bundle_signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"ulxagWuSBArhpENuih3PCG6FOJE/hq+8ekZ5oy8rd0m7Hm/ClS75Gsl+sb0wtPg0baReicy2MJ9pjs7b00IxCQ==","signed_message":"bundle_sha256_bytes","signed_at":"2026-07-07T05:29:03.788828Z","bundle_sha256":"fd4319e2c7ac905121aa64b8b24b626dbe9cf995f74601a2b05456f9320a9902"}}