<?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>0035-001X</journal-id>
<journal-title><![CDATA[Revista mexicana de física]]></journal-title>
<abbrev-journal-title><![CDATA[Rev. mex. fis.]]></abbrev-journal-title>
<issn>0035-001X</issn>
<publisher>
<publisher-name><![CDATA[Sociedad Mexicana de Física]]></publisher-name>
</publisher>
</journal-meta>
<article-meta>
<article-id>S0035-001X2016000500442</article-id>
<title-group>
<article-title xml:lang="en"><![CDATA[Symmetry field breaking effects in Sr2RuO4]]></article-title>
</title-group>
<contrib-group>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Contreras]]></surname>
<given-names><![CDATA[P.]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Florez]]></surname>
<given-names><![CDATA[J.]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Almeida]]></surname>
<given-names><![CDATA[Rafael]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
</contrib-group>
<aff id="Af1">
<institution><![CDATA[,Universidad de Los Andes Centro de Física Fundamental ]]></institution>
<addr-line><![CDATA[Mérida ]]></addr-line>
<country>Venezuela</country>
</aff>
<aff id="Af2">
<institution><![CDATA[,Universidad Distrital Francisco José de Caldas Departamento de Física ]]></institution>
<addr-line><![CDATA[Bogotá ]]></addr-line>
<country>Colombia</country>
</aff>
<aff id="Af3">
<institution><![CDATA[,Universidad de Los Andes Departamento de Química ]]></institution>
<addr-line><![CDATA[Mérida ]]></addr-line>
<country>Venezuela</country>
</aff>
<pub-date pub-type="pub">
<day>00</day>
<month>10</month>
<year>2016</year>
</pub-date>
<pub-date pub-type="epub">
<day>00</day>
<month>10</month>
<year>2016</year>
</pub-date>
<volume>62</volume>
<numero>5</numero>
<fpage>442</fpage>
<lpage>449</lpage>
<copyright-statement/>
<copyright-year/>
<self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_arttext&amp;pid=S0035-001X2016000500442&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_abstract&amp;pid=S0035-001X2016000500442&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_pdf&amp;pid=S0035-001X2016000500442&amp;lng=en&amp;nrm=iso"></self-uri><abstract abstract-type="short" xml:lang="en"><p><![CDATA[In this work, after reviewing the theory of the elastic properties of Sr2RuO4, an extension suitable to explain the sound speed experiments of Lupien et al. and Clifford et al. is carried out. It is found that the discontinuity in the elastic constant C66 gives unambiguous experimental evidence that the Sr2RuO4 superconducting order parameter &#936; has two components and shows a broken time-reversal symmetry state. A detailed study of the elastic behavior is performed by means of a phenomenological theory employing the Ginzburg-Landau formalism.]]></p></abstract>
<abstract abstract-type="short" xml:lang="es"><p><![CDATA[En este trabajo, luego de realizar una revisión de la teoría de las propiedades elásticas del compuesto Sr2RuO4, se presenta una extensión que permite explicar los resultados de los experimentos, sobre la rapidez del sonido realizados por Lupien y colaboradores y Clifford y colaboradores . Se muestra que la discontinuidad observada en la constante elástica C66 constituye una evidencia experimental directa de que el parámetro de orden &#936; tiene dos componentes y rompe la simetría de inversión temporal. También se realiza un estudio detallado del comportamiento elástico usando una teoría fenomenológica basada en el formalismo de Ginzburg-Landau.]]></p></abstract>
<kwd-group>
<kwd lng="en"><![CDATA[Elastic properties]]></kwd>
<kwd lng="en"><![CDATA[unconventional superconductors]]></kwd>
<kwd lng="en"><![CDATA[time reversal symmetry]]></kwd>
<kwd lng="en"><![CDATA[Ginzburg-Landau theory]]></kwd>
<kwd lng="en"><![CDATA[sound speed]]></kwd>
<kwd lng="es"><![CDATA[Propiedades elásticas]]></kwd>
<kwd lng="es"><![CDATA[superconductores no convencionales]]></kwd>
<kwd lng="es"><![CDATA[simetría de inversión temporal]]></kwd>
<kwd lng="es"><![CDATA[teoría de Ginzburg-Landau]]></kwd>
<kwd lng="es"><![CDATA[rapidez del sonido]]></kwd>
</kwd-group>
</article-meta>
</front><back>
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