{"bundle_type":"pith_open_graph_bundle","bundle_version":"1.0","pith_number":"pith:2009:NGPWFUQU36PSLTDCREP4ZIKBV6","short_pith_number":"pith:NGPWFUQU","canonical_record":{"source":{"id":"0908.2842","kind":"arxiv","version":2},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"cond-mat.str-el","submitted_at":"2009-08-20T14:39:47Z","cross_cats_sorted":["cond-mat.other"],"title_canon_sha256":"be338d10530f88467f5ae43da20f4a88a73eca09250fe235d81d61e9dfefb5b5","abstract_canon_sha256":"1aba39b545c3ff4617251ddfb5b469a29067cd591c81e1ccee470470da940460"},"schema_version":"1.0"},"canonical_sha256":"699f62d214df9f25cc62891fcca141afad121aa402b62f03b289d3e58039c3d2","source":{"kind":"arxiv","id":"0908.2842","version":2},"source_aliases":[{"alias_kind":"arxiv","alias_value":"0908.2842","created_at":"2026-05-18T03:40:49Z"},{"alias_kind":"arxiv_version","alias_value":"0908.2842v2","created_at":"2026-05-18T03:40:49Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.0908.2842","created_at":"2026-05-18T03:40:49Z"},{"alias_kind":"pith_short_12","alias_value":"NGPWFUQU36PS","created_at":"2026-05-18T12:26:00Z"},{"alias_kind":"pith_short_16","alias_value":"NGPWFUQU36PSLTDC","created_at":"2026-05-18T12:26:00Z"},{"alias_kind":"pith_short_8","alias_value":"NGPWFUQU","created_at":"2026-05-18T12:26:00Z"}],"events":[{"event_type":"record_created","subject_pith_number":"pith:2009:NGPWFUQU36PSLTDCREP4ZIKBV6","target":"record","payload":{"canonical_record":{"source":{"id":"0908.2842","kind":"arxiv","version":2},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"cond-mat.str-el","submitted_at":"2009-08-20T14:39:47Z","cross_cats_sorted":["cond-mat.other"],"title_canon_sha256":"be338d10530f88467f5ae43da20f4a88a73eca09250fe235d81d61e9dfefb5b5","abstract_canon_sha256":"1aba39b545c3ff4617251ddfb5b469a29067cd591c81e1ccee470470da940460"},"schema_version":"1.0"},"canonical_sha256":"699f62d214df9f25cc62891fcca141afad121aa402b62f03b289d3e58039c3d2","receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-05-18T03:40:49.890161Z","signature_b64":"GQaskmO+d0XKEIH3VxPAYTr15by95w4+P032CzCzNcx76hfSj5PdsuW9VTq5kpynUIEjjG1vAUYheVQebfZ/AA==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"699f62d214df9f25cc62891fcca141afad121aa402b62f03b289d3e58039c3d2","last_reissued_at":"2026-05-18T03:40:49.889529Z","signature_status":"signed_v1","first_computed_at":"2026-05-18T03:40:49.889529Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"source_kind":"arxiv","source_id":"0908.2842","source_version":2,"attestation_state":"computed"},"signer":{"signer_id":"pith.science","signer_type":"pith_registry","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"created_at":"2026-05-18T03:40:49Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"C+ycAmzCvdJ8uNxMCgualhCYKW8raSjwXGJ+YoFjgT/aAlN42RzpSIPamTU4G2jxwgaxaRy98joM+LO0aUdOAw==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-05-30T10:38:39.273961Z"},"content_sha256":"bfacc68ac2f7ce250cba6bfd002f7f6a6631d33adf63d31b1f726464554e3000","schema_version":"1.0","event_id":"sha256:bfacc68ac2f7ce250cba6bfd002f7f6a6631d33adf63d31b1f726464554e3000"},{"event_type":"graph_snapshot","subject_pith_number":"pith:2009:NGPWFUQU36PSLTDCREP4ZIKBV6","target":"graph","payload":{"graph_snapshot":{"paper":{"title":"Doping effects in the coupled, two-leg spin ladder BiCu2PO6","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":["cond-mat.other"],"primary_cat":"cond-mat.str-el","authors_text":"A. V. Mahajan, B. Koteswararao, J. Bobroff, L.K.Alexander","submitted_at":"2009-08-20T14:39:47Z","abstract_excerpt":"We report preparation, x-ray diffraction, magnetic susceptibility chi(T) and heat capacity Cp(T) measurements on the undoped samples as also samples with Zn-doped (S = 0) at Cu site, Ni doped (S = 1) at Cu site, and Ca-doped (holes) at Bi site in the coupled two-leg spin ladder system BiCu2PO6. While, Zn shows complete solid solubility, Ni could be doped to about 20% and Ca to about 15%. Magnetization and heat capacity data in the undoped compound point towards the existence of frustration effects. In all the samples, the chi(T) at low temperature increases with doping content. The Zn-induced "},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"0908.2842","kind":"arxiv","version":2},"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":"2026-05-18T03:40:49Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"OFPigjhh8D+aQxyjWs1o0gcR8bCAO+e7ecAaYTMZb9ndDrRmn0Be1cWN6wIzf2WPhRKrhPRsyaw11IKrQ6PJBw==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-05-30T10:38:39.274782Z"},"content_sha256":"264263da164071b7ffa7dd8263428c85b732d87a710cd24bf2980e3258be339a","schema_version":"1.0","event_id":"sha256:264263da164071b7ffa7dd8263428c85b732d87a710cd24bf2980e3258be339a"}],"timestamp_proofs":[],"mirror_hints":[{"mirror_type":"https","name":"Pith Resolver","base_url":"https://pith.science","bundle_url":"https://pith.science/pith/NGPWFUQU36PSLTDCREP4ZIKBV6/bundle.json","state_url":"https://pith.science/pith/NGPWFUQU36PSLTDCREP4ZIKBV6/state.json","well_known_bundle_url":"https://pith.science/.well-known/pith/NGPWFUQU36PSLTDCREP4ZIKBV6/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":"2026-05-30T10:38:39Z","links":{"resolver":"https://pith.science/pith/NGPWFUQU36PSLTDCREP4ZIKBV6","bundle":"https://pith.science/pith/NGPWFUQU36PSLTDCREP4ZIKBV6/bundle.json","state":"https://pith.science/pith/NGPWFUQU36PSLTDCREP4ZIKBV6/state.json","well_known_bundle":"https://pith.science/.well-known/pith/NGPWFUQU36PSLTDCREP4ZIKBV6/bundle.json"},"state":{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2009:NGPWFUQU36PSLTDCREP4ZIKBV6","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":"1aba39b545c3ff4617251ddfb5b469a29067cd591c81e1ccee470470da940460","cross_cats_sorted":["cond-mat.other"],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"cond-mat.str-el","submitted_at":"2009-08-20T14:39:47Z","title_canon_sha256":"be338d10530f88467f5ae43da20f4a88a73eca09250fe235d81d61e9dfefb5b5"},"schema_version":"1.0","source":{"id":"0908.2842","kind":"arxiv","version":2}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"0908.2842","created_at":"2026-05-18T03:40:49Z"},{"alias_kind":"arxiv_version","alias_value":"0908.2842v2","created_at":"2026-05-18T03:40:49Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.0908.2842","created_at":"2026-05-18T03:40:49Z"},{"alias_kind":"pith_short_12","alias_value":"NGPWFUQU36PS","created_at":"2026-05-18T12:26:00Z"},{"alias_kind":"pith_short_16","alias_value":"NGPWFUQU36PSLTDC","created_at":"2026-05-18T12:26:00Z"},{"alias_kind":"pith_short_8","alias_value":"NGPWFUQU","created_at":"2026-05-18T12:26:00Z"}],"graph_snapshots":[{"event_id":"sha256:264263da164071b7ffa7dd8263428c85b732d87a710cd24bf2980e3258be339a","target":"graph","created_at":"2026-05-18T03:40:49Z","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":"We report preparation, x-ray diffraction, magnetic susceptibility chi(T) and heat capacity Cp(T) measurements on the undoped samples as also samples with Zn-doped (S = 0) at Cu site, Ni doped (S = 1) at Cu site, and Ca-doped (holes) at Bi site in the coupled two-leg spin ladder system BiCu2PO6. While, Zn shows complete solid solubility, Ni could be doped to about 20% and Ca to about 15%. Magnetization and heat capacity data in the undoped compound point towards the existence of frustration effects. In all the samples, the chi(T) at low temperature increases with doping content. The Zn-induced ","authors_text":"A. V. Mahajan, B. Koteswararao, J. Bobroff, L.K.Alexander","cross_cats":["cond-mat.other"],"headline":"","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"cond-mat.str-el","submitted_at":"2009-08-20T14:39:47Z","title":"Doping effects in the coupled, two-leg spin ladder BiCu2PO6"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"0908.2842","kind":"arxiv","version":2},"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:bfacc68ac2f7ce250cba6bfd002f7f6a6631d33adf63d31b1f726464554e3000","target":"record","created_at":"2026-05-18T03:40:49Z","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":"1aba39b545c3ff4617251ddfb5b469a29067cd591c81e1ccee470470da940460","cross_cats_sorted":["cond-mat.other"],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"cond-mat.str-el","submitted_at":"2009-08-20T14:39:47Z","title_canon_sha256":"be338d10530f88467f5ae43da20f4a88a73eca09250fe235d81d61e9dfefb5b5"},"schema_version":"1.0","source":{"id":"0908.2842","kind":"arxiv","version":2}},"canonical_sha256":"699f62d214df9f25cc62891fcca141afad121aa402b62f03b289d3e58039c3d2","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"699f62d214df9f25cc62891fcca141afad121aa402b62f03b289d3e58039c3d2","first_computed_at":"2026-05-18T03:40:49.889529Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-05-18T03:40:49.889529Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"GQaskmO+d0XKEIH3VxPAYTr15by95w4+P032CzCzNcx76hfSj5PdsuW9VTq5kpynUIEjjG1vAUYheVQebfZ/AA==","signature_status":"signed_v1","signed_at":"2026-05-18T03:40:49.890161Z","signed_message":"canonical_sha256_bytes"},"source_id":"0908.2842","source_kind":"arxiv","source_version":2}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:bfacc68ac2f7ce250cba6bfd002f7f6a6631d33adf63d31b1f726464554e3000","sha256:264263da164071b7ffa7dd8263428c85b732d87a710cd24bf2980e3258be339a"],"state_sha256":"eae7172442bfb8772d86ce114a4a6c51d41a2c60091cff68af71b62b45fb41e8"},"bundle_signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"VT1nreP1OVioAEU9ahFQoCwE3jK/MjaCrZ6HL5HTvnjJsW9LQVC+PBGVYh2ALa6pbaUeT4o5GPIHN36uS3jVBw==","signed_message":"bundle_sha256_bytes","signed_at":"2026-05-30T10:38:39.280848Z","bundle_sha256":"61f8cfe294456a6fa63feaebce8bebf0a3795b8441f455d16e2c46ba79f343fa"}}