Valence instabilities in rare earth systems as revealed by photoemission
Identifieur interne : 000157 ( Istex/Corpus ); précédent : 000156; suivant : 000158Valence instabilities in rare earth systems as revealed by photoemission
Auteurs : R. A. PollakSource :
- Journal of The Less-Common Metals [ 0022-5088 ] ; 1983.
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Abstract
Abstract: We used high resolution (δE < 150 meV) photoemission with synchrotron radiation in the range 10 eV < hv < 130 eV to study archetypal mixed valent and related cerium-, samarium-, europium-, thulium- and ytterbium-based systems. Generally all mixed valent systems (except the cerium-based system which is not yet fully characterized) exhibit an integer valent surface layer which has the lower value of the two bulk valence configurations. Temperature-dependent changes in bulk valence were observed in the europium and samarium compounds. Mixed valence was observed to persist down to at least 5 at.% dilution of thulium in TmxY1−xSe while thulium appears to remain trivalent in all TmxY1−xS compounds studied.
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DOI: 10.1016/0022-5088(83)90466-6
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Generally all mixed valent systems (except the cerium-based system which is not yet fully characterized) exhibit an integer valent surface layer which has the lower value of the two bulk valence configurations. Temperature-dependent changes in bulk valence were observed in the europium and samarium compounds. 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Mixed valence was observed to persist down to at least 5 at.% dilution of thulium in TmxY1−xSe while thulium appears to remain trivalent in all TmxY1−xS compounds studied.</abstract><qualityIndicators><score>1.998</score><pdfVersion>1.2</pdfVersion><pdfPageSize>468 x 684 pts</pdfPageSize><refBibsNative>true</refBibsNative><keywordCount>0</keywordCount><abstractCharCount>709</abstractCharCount><pdfWordCount>690</pdfWordCount><pdfCharCount>4232</pdfCharCount><pdfPageCount>2</pdfPageCount><abstractWordCount>109</abstractWordCount></qualityIndicators><title>Valence instabilities in rare earth systems as revealed by photoemission</title><pii><json:string>0022-5088(83)90466-6</json:string></pii><genre><json:string>research-article</json:string></genre><host><title>Journal of The Less-Common Metals</title><language><json:string>unknown</json:string></language><publicationDate>1983</publicationDate><issn><json:string>0022-5088</json:string></issn><pii><json:string>S0022-5088(00)X0263-9</json:string></pii><volume>93</volume><issue>1</issue><pages><first>201</first><last>202</last></pages><genre><json:string>journal</json:string></genre></host><categories><inist><json:string>sciences appliquees, technologies et medecines</json:string><json:string>sciences exactes et technologie</json:string><json:string>physique</json:string><json:string>etat condense: structure electronique, proprietes electriques, magnetiques et optiques</json:string></inist></categories><publicationDate>1983</publicationDate><copyrightDate>1983</copyrightDate><doi><json:string>10.1016/0022-5088(83)90466-6</json:string></doi><id>07A990B7D40E0194ACDA9DB91A479892CECD6EE4</id><score>1</score><fulltext><json:item><extension>pdf</extension><original>true</original><mimetype>application/pdf</mimetype><uri>https://api.istex.fr/document/07A990B7D40E0194ACDA9DB91A479892CECD6EE4/fulltext/pdf</uri></json:item><json:item><extension>zip</extension><original>false</original><mimetype>application/zip</mimetype><uri>https://api.istex.fr/document/07A990B7D40E0194ACDA9DB91A479892CECD6EE4/fulltext/zip</uri></json:item><istex:fulltextTEI uri="https://api.istex.fr/document/07A990B7D40E0194ACDA9DB91A479892CECD6EE4/fulltext/tei"><teiHeader><fileDesc><titleStmt><title level="a">Valence instabilities in rare earth systems as revealed by photoemission</title></titleStmt><publicationStmt><authority>ISTEX</authority><publisher>ELSEVIER</publisher><availability><p>ELSEVIER</p></availability><date>1983</date></publicationStmt><notesStmt><note>Paper presented at the Sixteenth Rare Earth Research Conference, The Florida State University, Tallahassee, FL, U.S.A., April 18–21, 1983.</note></notesStmt><sourceDesc><biblStruct type="inbook"><analytic><title level="a">Valence instabilities in rare earth systems as revealed by photoemission</title><author xml:id="author-1"><persName><forename type="first">R.A.</forename><surname>Pollak</surname></persName><affiliation>IBM Thomas J. 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Generally all mixed valent systems (except the cerium-based system which is not yet fully characterized) exhibit an integer valent surface layer which has the lower value of the two bulk valence configurations. Temperature-dependent changes in bulk valence were observed in the europium and samarium compounds. Mixed valence was observed to persist down to at least 5 at.% dilution of thulium in TmxY1−xSe while thulium appears to remain trivalent in all TmxY1−xS compounds studied.</p></abstract></profileDesc><revisionDesc><change when="1983">Published</change></revisionDesc></teiHeader></istex:fulltextTEI><json:item><extension>txt</extension><original>false</original><mimetype>text/plain</mimetype><uri>https://api.istex.fr/document/07A990B7D40E0194ACDA9DB91A479892CECD6EE4/fulltext/txt</uri></json:item></fulltext><metadata><istex:metadataXml wicri:clean="Elsevier, elements deleted: tail"><istex:xmlDeclaration>version="1.0" encoding="utf-8"</istex:xmlDeclaration><istex:docType PUBLIC="-//ES//DTD journal article DTD version 4.5.2//EN//XML" URI="art452.dtd" name="istex:docType"></istex:docType><istex:document><converted-article version="4.5.2" docsubtype="fla"><item-info><jid>JCLM</jid><aid>83904666</aid><ce:pii>0022-5088(83)90466-6</ce:pii><ce:doi>10.1016/0022-5088(83)90466-6</ce:doi><ce:copyright type="unknown" year="1983"></ce:copyright></item-info><head><ce:article-footnote><ce:label>☆</ce:label><ce:note-para>Paper presented at the Sixteenth Rare Earth Research Conference, The Florida State University, Tallahassee, FL, U.S.A., April 18–21, 1983.</ce:note-para></ce:article-footnote><ce:title>Valence instabilities in rare earth systems as revealed by photoemission</ce:title><ce:author-group><ce:author><ce:given-name>R.A.</ce:given-name><ce:surname>Pollak</ce:surname></ce:author><ce:affiliation><ce:textfn>IBM Thomas J. Watson Research Center, P.O. Box 218, Yorktown Heights, NY 10598 U.S.A.</ce:textfn></ce:affiliation></ce:author-group><ce:date-received day="28" month="2" year="1983"></ce:date-received><ce:abstract><ce:section-title>Abstract</ce:section-title><ce:abstract-sec><ce:simple-para>We used high resolution (<ce:italic>δE</ce:italic> < 150 meV) photoemission with synchrotron radiation in the range 10 eV < <ce:italic>hv</ce:italic> < 130 eV to study archetypal mixed valent and related cerium-, samarium-, europium-, thulium- and ytterbium-based systems. Generally all mixed valent systems (except the cerium-based system which is not yet fully characterized) exhibit an integer valent surface layer which has the lower value of the two bulk valence configurations. Temperature-dependent changes in bulk valence were observed in the europium and samarium compounds. Mixed valence was observed to persist down to at least 5 at.% dilution of thulium in Tm<ce:inf><ce:italic>x</ce:italic></ce:inf>Y<ce:inf>1−<ce:italic>x</ce:italic></ce:inf>Se while thulium appears to remain trivalent in all Tm<ce:inf><ce:italic>x</ce:italic></ce:inf>Y<ce:inf>1−<ce:italic>x</ce:italic></ce:inf>S compounds studied.</ce:simple-para></ce:abstract-sec></ce:abstract></head></converted-article></istex:document></istex:metadataXml><mods version="3.6"><titleInfo><title>Valence instabilities in rare earth systems as revealed by photoemission</title></titleInfo><titleInfo type="alternative" contentType="CDATA"><title>Valence instabilities in rare earth systems as revealed by photoemission</title></titleInfo><name type="personal"><namePart type="given">R.A.</namePart><namePart type="family">Pollak</namePart><affiliation>IBM Thomas J. Watson Research Center, P.O. 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Generally all mixed valent systems (except the cerium-based system which is not yet fully characterized) exhibit an integer valent surface layer which has the lower value of the two bulk valence configurations. Temperature-dependent changes in bulk valence were observed in the europium and samarium compounds. 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