<?xml version="1.0" encoding="ISO-8859-1"?><article xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance">
<front>
<journal-meta>
<journal-id>0370-3908</journal-id>
<journal-title><![CDATA[Revista de la Academia Colombiana de Ciencias Exactas, Físicas y Naturales]]></journal-title>
<abbrev-journal-title><![CDATA[Rev. acad. colomb. cienc. exact. fis. nat.]]></abbrev-journal-title>
<issn>0370-3908</issn>
<publisher>
<publisher-name><![CDATA[Academia Colombiana de Ciencias Exactas, Físicas y Naturales]]></publisher-name>
</publisher>
</journal-meta>
<article-meta>
<article-id>S0370-39082024000400742</article-id>
<article-id pub-id-type="doi">10.18257/raccefyn.2650</article-id>
<title-group>
<article-title xml:lang="en"><![CDATA[Effect of granularity on the superconducting parameters of the YBa2Cu3O7-&#948; superconducting material]]></article-title>
<article-title xml:lang="es"><![CDATA[Efecto de la granularidad en los parámetros superconductores del material superconductor YBa2Cu3O7-&#948;]]></article-title>
</title-group>
<contrib-group>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Torres-Mahmud]]></surname>
<given-names><![CDATA[Ibrahim]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Piragua-Ortiz]]></surname>
<given-names><![CDATA[Nicolás]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Vargas-Pineda]]></surname>
<given-names><![CDATA[Eliana M.]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Landínez Téllez]]></surname>
<given-names><![CDATA[David A.]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
<xref ref-type="aff" rid="Aaf"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Roa-Rojas]]></surname>
<given-names><![CDATA[Jairo]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
<xref ref-type="aff" rid="Aaf"/>
</contrib>
</contrib-group>
<aff id="Af1">
<institution><![CDATA[,Universidad Nacional de Colombia  ]]></institution>
<addr-line><![CDATA[Bogotá D.C.]]></addr-line>
<country>Colombia</country>
</aff>
<aff id="Af2">
<institution><![CDATA[,Universidad Nacional de Colombia  ]]></institution>
<addr-line><![CDATA[Bogotá D.C.]]></addr-line>
<country>Colombia</country>
</aff>
<pub-date pub-type="pub">
<day>00</day>
<month>12</month>
<year>2024</year>
</pub-date>
<pub-date pub-type="epub">
<day>00</day>
<month>12</month>
<year>2024</year>
</pub-date>
<volume>48</volume>
<numero>189</numero>
<fpage>742</fpage>
<lpage>751</lpage>
<copyright-statement/>
<copyright-year/>
<self-uri xlink:href="http://www.scielo.org.co/scielo.php?script=sci_arttext&amp;pid=S0370-39082024000400742&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.co/scielo.php?script=sci_abstract&amp;pid=S0370-39082024000400742&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.co/scielo.php?script=sci_pdf&amp;pid=S0370-39082024000400742&amp;lng=en&amp;nrm=iso"></self-uri><abstract abstract-type="short" xml:lang="en"><p><![CDATA[Abstract We conducted an analysis of the coherent transition behavior of the YBa2Cu3O7-&#948; superconducting material by varying its granular properties. Considering the sintering temperature-grain size relation, we created six samples of YBa2Cu3O7-&#948; through solid state synthesis and subjected them to the following sintering temperatures: 860°C, 870°C, 880°C, two samples at 890°C, and one at 900°C. Once the synthesis process was completed, we characterized the samples by analyzing their crystallographic structure, morphology, and magnetic response. The Rietveld refinement of diffraction patterns confirmed the structural single phase and its crystal structure; the scanning electron microscopy images extracted an increasing relation between grain size and sintering temperature, and the magnetic analysis determined a constant critical paring temperature of Tc = 93(1) K, a constant lower critical field of Hc1 = 0.5(2) kOe, and an increasing critical density current and 'saturation' temperature, Tsat. This behavior probably responds to Tc and Hc1 being related to the pairing transition and Tsat to the coherence transition.]]></p></abstract>
<abstract abstract-type="short" xml:lang="es"><p><![CDATA[Resumen Se analizó el comportamiento de transición coherente del material superconductor YBa2Cu3O7-&#948; variando sus propiedades granulares. Considerando la relación entre la temperatura de sinterización y el tamaño de grano, se fabricaron seis muestras de c mediante síntesis en estado sólido. Cada muestra se sometió a las siguientes temperaturas de sinterización: 860 °C, 870 °C, 880 °C, dos muestras a 890 °C y una a 900 °C. Una vez finalizado el proceso de síntesis, se caracterizaron las muestras mediante el análisis de la estructura cristalográfica y morfológica y la respuesta magnética. Utilizando el refinamiento de Rietveld de los patrones de difracción se confirmó la fase única estructural, así como su estructura cristalina; las imágenes de microscopía electrónica de barrido evidenciaron una relación creciente entre el tamaño de grano y la temperatura de sinterización, y el análisis magnético se utilizó para determinar una temperatura crítica de apareamiento constante de Tc = 93(1) K, un campo crítico inferior constante de Hc1 = 0,5(2) kOe, y una corriente de densidad crítica y una temperatura de "saturación", Tsat, crecientes. Se cree que este comportamiento responde a la relación de Tc y Hc1 con la transición de emparejamiento y la de la Tsat con la transición de coherencia.]]></p></abstract>
<kwd-group>
<kwd lng="en"><![CDATA[Superconductivity]]></kwd>
<kwd lng="en"><![CDATA[Granularity]]></kwd>
<kwd lng="en"><![CDATA[Critical parameters]]></kwd>
<kwd lng="en"><![CDATA[Coherence transition]]></kwd>
<kwd lng="en"><![CDATA[Perovskite]]></kwd>
<kwd lng="en"><![CDATA[Grain size]]></kwd>
<kwd lng="es"><![CDATA[Superconductividad]]></kwd>
<kwd lng="es"><![CDATA[Granularidad]]></kwd>
<kwd lng="es"><![CDATA[Parámetros críticos]]></kwd>
<kwd lng="es"><![CDATA[Transición de coherencia]]></kwd>
<kwd lng="es"><![CDATA[Perovskita]]></kwd>
<kwd lng="es"><![CDATA[Tamaño de grano]]></kwd>
</kwd-group>
</article-meta>
</front><back>
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