A Systematic Study of Electron-Phonon Coupling to Oxygen Modes Across the Cuprates

The large variations of T$_c$ across the cuprate families is one of the major unsolved puzzles in condensed matter physics, and is poorly understood. Although there appears to be a great deal of universality in the cuprates, several orders of magnitude changes in T$_c$ can be achieved through changes in the chemical composition and structure of the unit cell. In this paper we formulate a systematic examination of the variations in electron-phonon coupling to oxygen phonons in the cuprates, incorporating a number of effects arising from several aspects of chemical composition and doping across cuprate families. It is argued that the electron-phonon coupling is a very sensitive probe of the material-dependent variations of chemical structure, affecting the orbital character of the band crossing the Fermi level, the strength of local electric fields arising from structural-induced symmetry breaking, doping dependent changes in the underlying band structure, and ionicity of the crystal governing the ability of the material to screen $c$-axis perturbations. Using electrostatic Ewald calculations and known experimental structural data, we establish a connection between the material's maximal T$_c$ at optimal doping and the strength of coupling to $c$-axis modes. We demonstrate that materials with the largest coupling to the out-of-phase bond-buckling (``$B_{1g}$") oxygen phonon branch also have the largest T$_c$'s. In light of this observation we present model T$_c$ calculations using a two-well model where phonons work in conjunction with a dominant pairing interaction, presumably due to spin fluctuations, indicating how phonons can generate sizeable enhancements to T$_c$ despite the relatively small coupling strengths. Combined, these results can provide a natural framework for understanding the doping and material dependence of T$_c$ across the cuprates.Comment: 29 Pages, 21 Figures, Submitted to PR

Analysis of methods of translation and linguistic adaptation of biomedical terminology in the texts of scientific articles on breast cancer

The integration of modern technologies from biological sciences into medical practice has given rise to new terms and the non-equivalent vocabulary, which requires adequate translation. Abbreviations are the most frequent type of word formation in medical texts, and the article examines several methods to translate them. The contextual comparative analysis of terms-abbreviations from 10 biomedical texts concerning breast oncology was carried out using the method of continuous text search, with the classification of methods of translation. Of the 73 analyzed biomedical terms, the equivalent vocabulary prevailed in 46 (63 %), which ensures the accuracy and unambiguity of translation, partially equivalent – 25 (34,2 %) and 2 terms (2,8 %) were determined as showing no equivalence. Acronym- terms accounted for 23 (17,3 %), abbreviations – 36 (49 %). Among the detected abbreviations, 42 words (57,14 %) were borrowed with the English spelling; abbreviations translated into Russian by transliteration were twice as rare 23 (17,14 %); abbreviations having equivalent meanings in Russian scientific literature – 27 (20 %). Abbreviations that include alphab etic and numeric values are not translated into Russian and are supplemented with a decoding to preserve the meaning.Интеграция современных технологий из биологических наук в медицинскую практику привела к образованию новых терминов и появлению безэквивалентной лексики, которая требует адекватного перевода. Аббревиация – наиболее характерный вид словообразования в медицинских текстах, поэтому выделяют несколько способов перевода сложносокращенных слов, рассмотренных в данной статье. Методом сплошного текстового поиска был проведен контекстный сопоставительный анализ и классификация способов перевода терминов-аббревиатур из 10 текстов медико-биологических статей, посвященных онкологии молочной железы. Среди 73 проанализированных медико-биологических терминов преобладает эквивалентная лексика – 46 терминов (63 %), которая обеспечивает точность и однозначность перевода, частично эквивалентная – 25 терминов (34,2 %) и 2 безэквивалентных термина (2,8 %). Термины-акронимы составляют 23 (17,3 %), аббревиатуры – 36 (49 %). Среди аббревиатур 42 (57,14 %) заимствованы с сохранением английского написания; в два раза реже – 23 (17,14 %) – встречались варианты, переданные на русский язык путем транслитерации; аббревиатуры, имеющие эквивалентные значения в русскоязычной научной литературе, – 27 (20 %). Было показано, что аббревиатуры, которые включают в свой состав буквенные и числовые значения, не переводятся на русский язык и для сохранения смысла дополняются расшифровкой