{"id":"https://openalex.org/W2048699732","doi":"https://doi.org/10.1063/1.432804","title":"Anomalous temperature dependence of the frequency and damping constant of phonons near T\u03bb in ammonium halides","display_name":"Anomalous temperature dependence of the frequency and damping constant of phonons near T\u03bb in ammonium halides","publication_year":1976,"publication_date":"1976-07-01","ids":{"openalex":"https://openalex.org/W2048699732","doi":"https://doi.org/10.1063/1.432804","mag":"2048699732"},"language":"en","primary_location":{"id":"doi:10.1063/1.432804","doi":"https://doi.org/10.1063/1.432804","is_oa":false,"landing_page_url":"https://doi.org/10.1063/1.432804","pdf_url":null,"source":{"id":"https://openalex.org/S77047749","display_name":"The Journal of Chemical Physics","issn_l":"0021-9606","issn":["0021-9606","1089-7690","1520-9032"],"is_oa":false,"is_in_doaj":false,"is_core":true,"listed_in":["anvur-scientific","cwts-core","dongbi-b","jufo-1","ki-jl-1","medline","norway-1","poland-100","russia-white-list-2","vabb-shw"],"host_organization":"https://openalex.org/P4310320257","host_organization_name":"American Institute of Physics","host_organization_lineage":["https://openalex.org/P4310320257"],"host_organization_lineage_names":["American Institute of Physics"],"type":"journal"},"license":null,"license_id":null,"version":"publishedVersion","is_accepted":true,"is_published":true,"raw_source_name":"The Journal of Chemical Physics","raw_type":"journal-article"},"volume":null,"type":"article","is_traditional":true,"indexed_in":["crossref"],"open_access":{"is_oa":false,"oa_status":"closed","oa_url":null,"any_repository_has_fulltext":false},"authorships":[{"author_position":"first","author":{"id":"https://openalex.org/A5110023630","display_name":"Mitsugu Matsushita","orcid":null,"observed_orcids":[]},"institutions":[{"id":"https://openalex.org/I201537933","display_name":"Tohoku University","ror":"https://ror.org/01dq60k83","country_code":"JP","type":"education","lineage":["https://openalex.org/I201537933"]},{"id":"https://openalex.org/I4405285984","display_name":"Research Institute of Electrical Communication, Tohoku University","ror":"https://ror.org/00vbrys56","country_code":"JP","type":"facility","lineage":["https://openalex.org/I201537933","https://openalex.org/I4405285984"]}],"countries":["JP"],"is_corresponding":true,"raw_author_name":"Mitsugu Matsushita","raw_affiliation_strings":["Research Institute of Electrical Communication, Tohoku University, Sendai 980, Japan"],"raw_orcid":null,"affiliations":[{"raw_affiliation_string":"Research Institute of Electrical Communication, Tohoku University, Sendai 980, Japan","institution_ids":["https://openalex.org/I201537933","https://openalex.org/I4405285984"]}]}],"institutions":[],"countries_distinct_count":1,"institutions_distinct_count":2,"corresponding_author_ids":["https://openalex.org/A5110023630"],"corresponding_institution_ids":["https://openalex.org/I201537933","https://openalex.org/I4405285984"],"apc_list":{"value":3500,"currency":"USD","value_usd":3500},"apc_paid":null,"fwci":2.8196,"has_fulltext":false,"cited_by_count":87,"citation_normalized_percentile":{"value":0.90202518,"is_in_top_1_percent":false,"is_in_top_10_percent":true},"cited_by_percentile_year":{"min":88,"max":99},"biblio":{"volume":"65","issue":"1","first_page":"23","last_page":"28"},"is_retracted":false,"is_paratext":false,"is_xpac":false,"primary_topic":{"id":"https://openalex.org/T11878","display_name":"Solid-state spectroscopy and crystallography","score":0.9189000129699707,"subfield":{"id":"https://openalex.org/subfields/2505","display_name":"Materials Chemistry"},"field":{"id":"https://openalex.org/fields/25","display_name":"Materials Science"},"domain":{"id":"https://openalex.org/domains/3","display_name":"Physical Sciences"}},"topics":[{"id":"https://openalex.org/T11878","display_name":"Solid-state spectroscopy and crystallography","score":0.9189000129699707,"subfield":{"id":"https://openalex.org/subfields/2505","display_name":"Materials Chemistry"},"field":{"id":"https://openalex.org/fields/25","display_name":"Materials Science"},"domain":{"id":"https://openalex.org/domains/3","display_name":"Physical Sciences"}},{"id":"https://openalex.org/T10591","display_name":"Theoretical and Computational Physics","score":0.046300001442432404,"subfield":{"id":"https://openalex.org/subfields/3104","display_name":"Condensed Matter Physics"},"field":{"id":"https://openalex.org/fields/31","display_name":"Physics and Astronomy"},"domain":{"id":"https://openalex.org/domains/3","display_name":"Physical Sciences"}},{"id":"https://openalex.org/T12875","display_name":"Thermal Expansion and Ionic Conductivity","score":0.011599999852478504,"subfield":{"id":"https://openalex.org/subfields/2505","display_name":"Materials Chemistry"},"field":{"id":"https://openalex.org/fields/25","display_name":"Materials Science"},"domain":{"id":"https://openalex.org/domains/3","display_name":"Physical Sciences"}}],"keywords":[{"id":"https://openalex.org/keywords/lambda-transition","display_name":"lambda transition","score":0.8050000071525574},{"id":"https://openalex.org/keywords/ammonium-halides","display_name":"ammonium halides","score":0.8650000095367432},{"id":"https://openalex.org/keywords/phonon-frequencies","display_name":"phonon frequencies","score":0.8659999966621399},{"id":"https://openalex.org/keywords/phonon-damping","display_name":"phonon damping","score":0.9539999961853027},{"id":"https://openalex.org/keywords/long-range-order-parameter","display_name":"long-range order parameter","score":0.7170000076293945},{"id":"https://openalex.org/keywords/spin-correlation-functions","display_name":"spin correlation functions","score":0.8420000076293945},{"id":"https://openalex.org/keywords/ammonium-chloride","display_name":"ammonium chloride","score":0.8840000033378601},{"id":"https://openalex.org/keywords/ammonium-bromide","display_name":"ammonium bromide","score":0.9959999918937683},{"id":"https://openalex.org/keywords/raman-scattering","display_name":"Raman scattering","score":0.781000018119812}],"concepts":[{"id":"https://openalex.org/C26873012","wikidata":"https://www.wikidata.org/wiki/Q214781","display_name":"Condensed matter physics","level":1,"score":0.7906162142753601},{"id":"https://openalex.org/C24169881","wikidata":"https://www.wikidata.org/wiki/Q186608","display_name":"Phonon","level":2,"score":0.7892881035804749},{"id":"https://openalex.org/C130787639","wikidata":"https://www.wikidata.org/wiki/Q5645293","display_name":"Hamiltonian (control theory)","level":2,"score":0.6366379261016846},{"id":"https://openalex.org/C121332964","wikidata":"https://www.wikidata.org/wiki/Q413","display_name":"Physics","level":0,"score":0.632627546787262},{"id":"https://openalex.org/C51329190","wikidata":"https://www.wikidata.org/wiki/Q1076349","display_name":"Ising model","level":2,"score":0.5500277280807495},{"id":"https://openalex.org/C183276030","wikidata":"https://www.wikidata.org/wiki/Q1193095","display_name":"Coupling constant","level":2,"score":0.5285543203353882},{"id":"https://openalex.org/C2778113609","wikidata":"https://www.wikidata.org/wiki/Q10897","display_name":"Lambda","level":2,"score":0.5035516619682312},{"id":"https://openalex.org/C191486275","wikidata":"https://www.wikidata.org/wiki/Q210028","display_name":"Scattering","level":2,"score":0.45156151056289673},{"id":"https://openalex.org/C39353612","wikidata":"https://www.wikidata.org/wiki/Q5283759","display_name":"Atmospheric temperature range","level":2,"score":0.41833069920539856},{"id":"https://openalex.org/C169573571","wikidata":"https://www.wikidata.org/wiki/Q466824","display_name":"Raman scattering","level":3,"score":0.4182334542274475},{"id":"https://openalex.org/C2778870898","wikidata":"https://www.wikidata.org/wiki/Q7577658","display_name":"Spins","level":2,"score":0.4173503518104553},{"id":"https://openalex.org/C62520636","wikidata":"https://www.wikidata.org/wiki/Q944","display_name":"Quantum mechanics","level":1,"score":0.3621865510940552},{"id":"https://openalex.org/C40003534","wikidata":"https://www.wikidata.org/wiki/Q862228","display_name":"Raman spectroscopy","level":2,"score":0.29750245809555054},{"id":"https://openalex.org/C97355855","wikidata":"https://www.wikidata.org/wiki/Q11473","display_name":"Thermodynamics","level":1,"score":0.11212769150733948},{"id":"https://openalex.org/C126255220","wikidata":"https://www.wikidata.org/wiki/Q141495","display_name":"Mathematical optimization","level":1,"score":0.0},{"id":"https://openalex.org/C33923547","wikidata":"https://www.wikidata.org/wiki/Q395","display_name":"Mathematics","level":0,"score":0.0}],"mesh":[],"locations_count":1,"locations":[{"id":"doi:10.1063/1.432804","doi":"https://doi.org/10.1063/1.432804","is_oa":false,"landing_page_url":"https://doi.org/10.1063/1.432804","pdf_url":null,"source":{"id":"https://openalex.org/S77047749","display_name":"The Journal of Chemical Physics","issn_l":"0021-9606","issn":["0021-9606","1089-7690","1520-9032"],"is_oa":false,"is_in_doaj":false,"is_core":true,"listed_in":["anvur-scientific","cwts-core","dongbi-b","jufo-1","ki-jl-1","medline","norway-1","poland-100","russia-white-list-2","vabb-shw"],"host_organization":"https://openalex.org/P4310320257","host_organization_name":"American Institute of Physics","host_organization_lineage":["https://openalex.org/P4310320257"],"host_organization_lineage_names":["American Institute of Physics"],"type":"journal"},"license":null,"license_id":null,"version":"publishedVersion","is_accepted":true,"is_published":true,"raw_source_name":"The Journal of Chemical Physics","raw_type":"journal-article"}],"best_oa_location":null,"sustainable_development_goals":[],"study_designs":[],"awards":[],"funders":[],"has_content":{"pdf":false,"grobid_xml":false},"content_urls":null,"referenced_works_count":8,"referenced_works":["https://openalex.org/W1489314471","https://openalex.org/W1995429303","https://openalex.org/W2003537107","https://openalex.org/W2008040278","https://openalex.org/W2048191962","https://openalex.org/W2049815133","https://openalex.org/W3003955138","https://openalex.org/W4236518199"],"related_works":["https://openalex.org/W2032285051","https://openalex.org/W2027573787","https://openalex.org/W2082654462","https://openalex.org/W2074982977","https://openalex.org/W2012409742","https://openalex.org/W1975270539","https://openalex.org/W2592217387","https://openalex.org/W1986256387","https://openalex.org/W171609795","https://openalex.org/W7007824420"],"abstract_inverted_index":{"The":[0,23,64,105,140],"mechanism":[1],"which":[2,92],"gives":[3],"rise":[4],"to":[5,56,78,96],"the":[6,14,40,62,68,71,89,109,114,117,125,143,147],"anomalous":[7,110],"temperature":[8,99,111,144],"dependence":[9],"of":[10,25,42,74,88,120,132,146],"nonsoft":[11,121],"phonons":[12,75,123],"near":[13,101,124],"lambda":[15,103,126],"transition":[16],"point":[17],"in":[18,29,61,113,136,149],"ammonium":[19,27],"halides":[20],"is":[21,33,47,54,153],"discussed.":[22,155],"orientation":[24],"an":[26],"ion":[28],"its":[30],"unit":[31],"cell":[32],"treated":[34],"as":[35,128],"a":[36,43,80,85,102],"pseudo-Ising":[37,90],"spin,":[38],"and":[39,70,84,116,138],"Hamiltonian":[41],"pseudospin\u2013phonon":[44,58],"coupled":[45],"system":[46],"derived":[48],"from":[49],"simple":[50],"assumptions.":[51],"Perturbation":[52],"theory":[53],"used":[55],"evaluate":[57],"scattering":[59,134],"terms":[60],"Hamiltonian.":[63],"resulting":[65],"expressions":[66],"for":[67],"frequency":[69,115,148],"damping":[72,118],"constant":[73,119],"are":[76,93],"seen":[77],"include":[79],"long-range":[81],"order":[82],"parameter":[83],"correlation":[86],"function":[87],"spins,":[91],"well":[94],"known":[95],"show":[97],"characteristic":[98],"variations":[100],"point.":[104],"results":[106],"qualitatively":[107],"explain":[108],"variation":[112],"optical":[122],"point,":[127],"measured":[129],"by":[130],"means":[131],"Raman":[133],"experiments":[135],"NH4Cl":[137],"NH4Br.":[139],"difference":[141],"between":[142],"dependences":[145],"these":[150],"two":[151],"materials":[152],"also":[154]},"counts_by_year":[{"year":2026,"cited_by_count":2},{"year":2025,"cited_by_count":1},{"year":2022,"cited_by_count":3},{"year":2021,"cited_by_count":5},{"year":2020,"cited_by_count":2},{"year":2019,"cited_by_count":7},{"year":2017,"cited_by_count":3},{"year":2016,"cited_by_count":3},{"year":2014,"cited_by_count":1},{"year":2013,"cited_by_count":3},{"year":2012,"cited_by_count":7}],"updated_date":"2026-11-07T11:25:07.637180","created_date":"2016-06-24T00:00:00"}