Evidence for negative thermal expansion in the superconducting precursor phase SmFeAsO
The fluorine-doped rare-earth iron oxypnictide series SmFeAsO\(_{1-x}\)F\(_x\) (0 \(\leq x \leq\) 0.10) was investigated with high resolution powder x-ray scattering. In agreement with previous studies, the parent compound SmFeAsO exhibits a tetragonal-to-orthorhombic structural distortion at T\(\rm...
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| description | The fluorine-doped rare-earth iron oxypnictide series SmFeAsO\(_{1-x}\)F\(_x\) (0 \(\leq x \leq\) 0.10) was investigated with high resolution powder x-ray scattering. In agreement with previous studies, the parent compound SmFeAsO exhibits a tetragonal-to-orthorhombic structural distortion at T\(\rm{_{S}}\)~=~130~K which is rapidly suppressed by \(x \simeq\) 0.10 deep within the superconducting dome. The change in unit cell symmetry is followed by a previously unreported magnetoelastic distortion at 120~K. The temperature dependence of the thermal expansion coefficient \(\alpha_{V}\) reveals a rich phase diagram for SmFeAsO: (i) a global minimum at 125 K corresponds to the opening of a spin-density wave instability as measured by pump-probe femtosecond spectroscopy whilst (ii) a global maximum at 110 K corresponds to magnetic ordering of the Sm and Fe sublattices as measured by magnetic x-ray scattering. At much lower temperatures than T\(\rm{_{N}}\), SmFeAsO exhibits a significant negative thermal expansion on the order of -40~ppm~\(\cdot\)~K\(^{-1}\) in contrast to the behavior of other rare-earth oxypnictides such as PrFeAsO and the actinide oxypnictide NpFeAsO where the onset of \(\alpha |
| doi_str_mv | 10.48550/arxiv.1802.08648 |
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In agreement with previous studies, the parent compound SmFeAsO exhibits a tetragonal-to-orthorhombic structural distortion at T\(\rm{_{S}}\)~=~130~K which is rapidly suppressed by \(x \simeq\) 0.10 deep within the superconducting dome. The change in unit cell symmetry is followed by a previously unreported magnetoelastic distortion at 120~K. The temperature dependence of the thermal expansion coefficient \(\alpha_{V}\) reveals a rich phase diagram for SmFeAsO: (i) a global minimum at 125 K corresponds to the opening of a spin-density wave instability as measured by pump-probe femtosecond spectroscopy whilst (ii) a global maximum at 110 K corresponds to magnetic ordering of the Sm and Fe sublattices as measured by magnetic x-ray scattering. At much lower temperatures than T\(\rm{_{N}}\), SmFeAsO exhibits a significant negative thermal expansion on the order of -40~ppm~\(\cdot\)~K\(^{-1}\) in contrast to the behavior of other rare-earth oxypnictides such as PrFeAsO and the actinide oxypnictide NpFeAsO where the onset of \(\alpha <\) 0 only appears in the vicinity of magnetic ordering. Correlating this feature with the temperature and doping dependence of the resistivity and the unit cell parameters, we interpret the negative thermal expansion as being indicative of the possible condensation of itinerant electrons accompanying the opening of a SDW gap, consistent with transport measurements.</description><identifier>EISSN: 2331-8422</identifier><identifier>DOI: 10.48550/arxiv.1802.08648</identifier><language>eng</language><publisher>Ithaca: Cornell University Library, arXiv.org</publisher><subject>Distortion ; Fluorine ; Iron ; Phase diagrams ; Physics - Superconductivity ; Rare earth elements ; Spin density waves ; Stability ; Superconductivity ; Temperature ; Temperature dependence ; Thermal expansion ; Unit cell ; X-ray scattering</subject><ispartof>arXiv.org, 2018-02</ispartof><rights>2018. This work is published under http://arxiv.org/licenses/nonexclusive-distrib/1.0/ (the “License”). Notwithstanding the ProQuest Terms and Conditions, you may use this content in accordance with the terms of the License.</rights><rights>http://arxiv.org/licenses/nonexclusive-distrib/1.0</rights><oa>free_for_read</oa><woscitedreferencessubscribed>false</woscitedreferencessubscribed></display><links><openurl>$$Topenurl_article</openurl><openurlfulltext>$$Topenurlfull_article</openurlfulltext><thumbnail>$$Tsyndetics_thumb_exl</thumbnail><link.rule.ids>228,230,780,784,885,27925</link.rule.ids><backlink>$$Uhttps://doi.org/10.48550/arXiv.1802.08648$$DView paper in arXiv$$Hfree_for_read</backlink><backlink>$$Uhttps://doi.org/10.1088/1361-648X/aaa3b0$$DView published paper (Access to full text may be restricted)$$Hfree_for_read</backlink></links><search><creatorcontrib>Zhou, H D</creatorcontrib><creatorcontrib>Sarte, P M</creatorcontrib><creatorcontrib>Conner, B S</creatorcontrib><creatorcontrib>Balicas, L</creatorcontrib><creatorcontrib>Wiebe, C R</creatorcontrib><creatorcontrib>Chen, X H</creatorcontrib><creatorcontrib>T Wu</creatorcontrib><creatorcontrib>G Wu</creatorcontrib><creatorcontrib>Liu, R H</creatorcontrib><creatorcontrib>Chen, H</creatorcontrib><creatorcontrib>Fang, D F</creatorcontrib><title>Evidence for negative thermal expansion in the superconducting precursor phase SmFeAsO</title><title>arXiv.org</title><description>The fluorine-doped rare-earth iron oxypnictide series SmFeAsO\(_{1-x}\)F\(_x\) (0 \(\leq x \leq\) 0.10) was investigated with high resolution powder x-ray scattering. In agreement with previous studies, the parent compound SmFeAsO exhibits a tetragonal-to-orthorhombic structural distortion at T\(\rm{_{S}}\)~=~130~K which is rapidly suppressed by \(x \simeq\) 0.10 deep within the superconducting dome. The change in unit cell symmetry is followed by a previously unreported magnetoelastic distortion at 120~K. The temperature dependence of the thermal expansion coefficient \(\alpha_{V}\) reveals a rich phase diagram for SmFeAsO: (i) a global minimum at 125 K corresponds to the opening of a spin-density wave instability as measured by pump-probe femtosecond spectroscopy whilst (ii) a global maximum at 110 K corresponds to magnetic ordering of the Sm and Fe sublattices as measured by magnetic x-ray scattering. At much lower temperatures than T\(\rm{_{N}}\), SmFeAsO exhibits a significant negative thermal expansion on the order of -40~ppm~\(\cdot\)~K\(^{-1}\) in contrast to the behavior of other rare-earth oxypnictides such as PrFeAsO and the actinide oxypnictide NpFeAsO where the onset of \(\alpha <\) 0 only appears in the vicinity of magnetic ordering. Correlating this feature with the temperature and doping dependence of the resistivity and the unit cell parameters, we interpret the negative thermal expansion as being indicative of the possible condensation of itinerant electrons accompanying the opening of a SDW gap, consistent with transport measurements.</description><subject>Distortion</subject><subject>Fluorine</subject><subject>Iron</subject><subject>Phase diagrams</subject><subject>Physics - Superconductivity</subject><subject>Rare earth elements</subject><subject>Spin density waves</subject><subject>Stability</subject><subject>Superconductivity</subject><subject>Temperature</subject><subject>Temperature dependence</subject><subject>Thermal expansion</subject><subject>Unit cell</subject><subject>X-ray scattering</subject><issn>2331-8422</issn><fulltext>true</fulltext><rsrctype>article</rsrctype><creationdate>2018</creationdate><recordtype>article</recordtype><sourceid>ABUWG</sourceid><sourceid>AFKRA</sourceid><sourceid>AZQEC</sourceid><sourceid>BENPR</sourceid><sourceid>CCPQU</sourceid><sourceid>DWQXO</sourceid><sourceid>GOX</sourceid><recordid>eNotj01rAjEYhEOhULH-gJ4a6Hlt8ibZxKOItoLgodLrks2-qxHNbpNdsf--fvQ0MMwM8xDywtlYGqXYu41nfxpzw2DMTC7NAxmAEDwzEuCJjFLaM8Yg16CUGJDv-clXGBzSuok04NZ2_oS022E82gPFc2tD8k2gPlxNmvoWo2tC1bvOhy1tI7o-pku33dmE9Ou4wGlaP5PH2h4Sjv51SDaL-Wb2ma3WH8vZdJVZBTKDypY5F-Aqrq2RTEGthEBeG3S1MEZzWWo1KXWpQYC2UjCpam20ZegmMBFD8nqfvUEXbfRHG3-LK3xxg78k3u6JNjY_Paau2Dd9DJdPBTDNc6FASPEHKFhcng</recordid><startdate>20180223</startdate><enddate>20180223</enddate><creator>Zhou, H D</creator><creator>Sarte, P M</creator><creator>Conner, B S</creator><creator>Balicas, L</creator><creator>Wiebe, C R</creator><creator>Chen, X H</creator><creator>T Wu</creator><creator>G Wu</creator><creator>Liu, R H</creator><creator>Chen, H</creator><creator>Fang, D F</creator><general>Cornell University Library, arXiv.org</general><scope>8FE</scope><scope>8FG</scope><scope>ABJCF</scope><scope>ABUWG</scope><scope>AFKRA</scope><scope>AZQEC</scope><scope>BENPR</scope><scope>BGLVJ</scope><scope>CCPQU</scope><scope>DWQXO</scope><scope>HCIFZ</scope><scope>L6V</scope><scope>M7S</scope><scope>PIMPY</scope><scope>PQEST</scope><scope>PQQKQ</scope><scope>PQUKI</scope><scope>PRINS</scope><scope>PTHSS</scope><scope>GOX</scope></search><sort><creationdate>20180223</creationdate><title>Evidence for negative thermal expansion in the superconducting precursor phase SmFeAsO</title><author>Zhou, H D ; Sarte, P M ; Conner, B S ; Balicas, L ; Wiebe, C R ; Chen, X H ; T Wu ; G Wu ; Liu, R H ; Chen, H ; Fang, D F</author></sort><facets><frbrtype>5</frbrtype><frbrgroupid>cdi_FETCH-LOGICAL-a524-2dab6132cd17a84052f533e1f8ecf388714b759b7b72327a43045f787a0ec9293</frbrgroupid><rsrctype>articles</rsrctype><prefilter>articles</prefilter><language>eng</language><creationdate>2018</creationdate><topic>Distortion</topic><topic>Fluorine</topic><topic>Iron</topic><topic>Phase diagrams</topic><topic>Physics - Superconductivity</topic><topic>Rare earth elements</topic><topic>Spin density waves</topic><topic>Stability</topic><topic>Superconductivity</topic><topic>Temperature</topic><topic>Temperature dependence</topic><topic>Thermal expansion</topic><topic>Unit cell</topic><topic>X-ray scattering</topic><toplevel>online_resources</toplevel><creatorcontrib>Zhou, H D</creatorcontrib><creatorcontrib>Sarte, P M</creatorcontrib><creatorcontrib>Conner, B S</creatorcontrib><creatorcontrib>Balicas, L</creatorcontrib><creatorcontrib>Wiebe, C R</creatorcontrib><creatorcontrib>Chen, X H</creatorcontrib><creatorcontrib>T Wu</creatorcontrib><creatorcontrib>G Wu</creatorcontrib><creatorcontrib>Liu, R H</creatorcontrib><creatorcontrib>Chen, H</creatorcontrib><creatorcontrib>Fang, D F</creatorcontrib><collection>ProQuest SciTech Collection</collection><collection>ProQuest Technology Collection</collection><collection>Materials Science & Engineering Collection</collection><collection>ProQuest Central (Alumni Edition)</collection><collection>ProQuest Central UK/Ireland</collection><collection>ProQuest Central Essentials</collection><collection>ProQuest Central</collection><collection>Technology Collection</collection><collection>ProQuest One Community College</collection><collection>ProQuest Central Korea</collection><collection>SciTech Premium Collection</collection><collection>ProQuest Engineering Collection</collection><collection>Engineering Database</collection><collection>Access via ProQuest (Open Access)</collection><collection>ProQuest One Academic Eastern Edition (DO NOT USE)</collection><collection>ProQuest One Academic</collection><collection>ProQuest One Academic UKI Edition</collection><collection>ProQuest Central China</collection><collection>Engineering Collection</collection><collection>arXiv.org</collection><jtitle>arXiv.org</jtitle></facets><delivery><delcategory>Remote Search Resource</delcategory><fulltext>fulltext</fulltext></delivery><addata><au>Zhou, H D</au><au>Sarte, P M</au><au>Conner, B S</au><au>Balicas, L</au><au>Wiebe, C R</au><au>Chen, X H</au><au>T Wu</au><au>G Wu</au><au>Liu, R H</au><au>Chen, H</au><au>Fang, D F</au><format>journal</format><genre>article</genre><ristype>JOUR</ristype><atitle>Evidence for negative thermal expansion in the superconducting precursor phase SmFeAsO</atitle><jtitle>arXiv.org</jtitle><date>2018-02-23</date><risdate>2018</risdate><eissn>2331-8422</eissn><abstract>The fluorine-doped rare-earth iron oxypnictide series SmFeAsO\(_{1-x}\)F\(_x\) (0 \(\leq x \leq\) 0.10) was investigated with high resolution powder x-ray scattering. In agreement with previous studies, the parent compound SmFeAsO exhibits a tetragonal-to-orthorhombic structural distortion at T\(\rm{_{S}}\)~=~130~K which is rapidly suppressed by \(x \simeq\) 0.10 deep within the superconducting dome. The change in unit cell symmetry is followed by a previously unreported magnetoelastic distortion at 120~K. The temperature dependence of the thermal expansion coefficient \(\alpha_{V}\) reveals a rich phase diagram for SmFeAsO: (i) a global minimum at 125 K corresponds to the opening of a spin-density wave instability as measured by pump-probe femtosecond spectroscopy whilst (ii) a global maximum at 110 K corresponds to magnetic ordering of the Sm and Fe sublattices as measured by magnetic x-ray scattering. At much lower temperatures than T\(\rm{_{N}}\), SmFeAsO exhibits a significant negative thermal expansion on the order of -40~ppm~\(\cdot\)~K\(^{-1}\) in contrast to the behavior of other rare-earth oxypnictides such as PrFeAsO and the actinide oxypnictide NpFeAsO where the onset of \(\alpha <\) 0 only appears in the vicinity of magnetic ordering. Correlating this feature with the temperature and doping dependence of the resistivity and the unit cell parameters, we interpret the negative thermal expansion as being indicative of the possible condensation of itinerant electrons accompanying the opening of a SDW gap, consistent with transport measurements.</abstract><cop>Ithaca</cop><pub>Cornell University Library, arXiv.org</pub><doi>10.48550/arxiv.1802.08648</doi><oa>free_for_read</oa></addata></record> |
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| subjects | Distortion Fluorine Iron Phase diagrams Physics - Superconductivity Rare earth elements Spin density waves Stability Superconductivity Temperature Temperature dependence Thermal expansion Unit cell X-ray scattering |
| title | Evidence for negative thermal expansion in the superconducting precursor phase SmFeAsO |
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