<i>T<sub>c</sub></i> Saturation and Possible Electronic Phase Separation in Strongly Overdoped Cuprates
In order to elucidate the unusual superconducting properties of cuprates in the strongly overdoped region, i.e., at hole-doping levels <inline-formula><math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><semantics><mrow><mi>p</mi>...
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| Format: | Article |
| Language: | English |
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MDPI AG
2023-07-01
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| Series: | Condensed Matter |
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| Online Access: | https://www.mdpi.com/2410-3896/8/3/56 |
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| author | Amirreza Hemmatzade Elena Medina Ludovic Delbes Benoît Baptiste David Hrabovsky Yannick Klein Steven D. Conradson Maarit Karppinen Andrea Gauzzi |
| author_facet | Amirreza Hemmatzade Elena Medina Ludovic Delbes Benoît Baptiste David Hrabovsky Yannick Klein Steven D. Conradson Maarit Karppinen Andrea Gauzzi |
| author_sort | Amirreza Hemmatzade |
| collection | DOAJ |
| description | In order to elucidate the unusual superconducting properties of cuprates in the strongly overdoped region, i.e., at hole-doping levels <inline-formula><math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><semantics><mrow><mi>p</mi><mo>≳</mo><mn>0.4</mn></mrow></semantics></math></inline-formula>/Cu in the CuO<inline-formula><math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><semantics><msub><mrow></mrow><mn>2</mn></msub></semantics></math></inline-formula> plane, we study the structural and superconducting properties of a series of Cu<inline-formula><math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><semantics><msub><mrow></mrow><mrow><mn>0.75</mn></mrow></msub></semantics></math></inline-formula>Mo<inline-formula><math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><semantics><msub><mrow></mrow><mrow><mn>0.25</mn></mrow></msub></semantics></math></inline-formula>Sr<inline-formula><math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><semantics><msub><mrow></mrow><mn>2</mn></msub></semantics></math></inline-formula>YCu<inline-formula><math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><semantics><msub><mrow></mrow><mn>2</mn></msub></semantics></math></inline-formula>O<inline-formula><math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><semantics><msub><mrow></mrow><mrow><mn>7</mn><mo>+</mo><mi>x</mi></mrow></msub></semantics></math></inline-formula> powder samples oxygenated under high pressure using different concentrations of KClO<inline-formula><math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><semantics><msub><mrow></mrow><mn>3</mn></msub></semantics></math></inline-formula> up to 35 mol %. The analysis of X-ray diffraction data indicates a high purity ∼90% of all samples and suggests that the concentration, <i>x</i>, of extra oxygen atoms increases with increasing KClO<inline-formula><math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><semantics><msub><mrow></mrow><mn>3</mn></msub></semantics></math></inline-formula> concentration. Surprisingly, the <inline-formula><math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><semantics><msub><mi>T</mi><mi>c</mi></msub></semantics></math></inline-formula> values remain nearly constant within the 80–85 K range independent of KClO<inline-formula><math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><semantics><msub><mrow></mrow><mn>3</mn></msub></semantics></math></inline-formula> concentration, which suggests a scenario of <inline-formula><math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><semantics><msub><mi>T</mi><mi>c</mi></msub></semantics></math></inline-formula> saturation. In order to account for this unexpected behaviour, we put forward the hypothesis that overdoping enhances the density of unpaired holes, which is supported by the observation of large values of the Sommerfeld coefficient in all samples. We therefore propose a scenario of electronic phase separation between normal and superconducting holes. |
| first_indexed | 2024-03-10T22:54:18Z |
| format | Article |
| id | doaj.art-8436b576b29c4824a57cd3f856eceb8c |
| institution | Directory Open Access Journal |
| issn | 2410-3896 |
| language | English |
| last_indexed | 2024-03-10T22:54:18Z |
| publishDate | 2023-07-01 |
| publisher | MDPI AG |
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| series | Condensed Matter |
| spelling | doaj.art-8436b576b29c4824a57cd3f856eceb8c2023-11-19T10:07:38ZengMDPI AGCondensed Matter2410-38962023-07-01835610.3390/condmat8030056<i>T<sub>c</sub></i> Saturation and Possible Electronic Phase Separation in Strongly Overdoped CupratesAmirreza Hemmatzade0Elena Medina1Ludovic Delbes2Benoît Baptiste3David Hrabovsky4Yannick Klein5Steven D. Conradson6Maarit Karppinen7Andrea Gauzzi8IMPMC, Sorbonne Université, CNRS and MNHN, 4, Place Jussieu, 75005 Paris, FranceDepartment of Chemistry and Materials Science, Aalto University, 00076 Espoo, FinlandIMPMC, Sorbonne Université, CNRS and MNHN, 4, Place Jussieu, 75005 Paris, FranceIMPMC, Sorbonne Université, CNRS and MNHN, 4, Place Jussieu, 75005 Paris, FranceSorbonne Université, Mesures Physiques à Basses Températures, 75005 Paris, FranceIMPMC, Sorbonne Université, CNRS and MNHN, 4, Place Jussieu, 75005 Paris, FranceDepartment of Chemistry, Washington State University, Pullman, WA 90164, USADepartment of Chemistry and Materials Science, Aalto University, 00076 Espoo, FinlandIMPMC, Sorbonne Université, CNRS and MNHN, 4, Place Jussieu, 75005 Paris, FranceIn order to elucidate the unusual superconducting properties of cuprates in the strongly overdoped region, i.e., at hole-doping levels <inline-formula><math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><semantics><mrow><mi>p</mi><mo>≳</mo><mn>0.4</mn></mrow></semantics></math></inline-formula>/Cu in the CuO<inline-formula><math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><semantics><msub><mrow></mrow><mn>2</mn></msub></semantics></math></inline-formula> plane, we study the structural and superconducting properties of a series of Cu<inline-formula><math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><semantics><msub><mrow></mrow><mrow><mn>0.75</mn></mrow></msub></semantics></math></inline-formula>Mo<inline-formula><math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><semantics><msub><mrow></mrow><mrow><mn>0.25</mn></mrow></msub></semantics></math></inline-formula>Sr<inline-formula><math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><semantics><msub><mrow></mrow><mn>2</mn></msub></semantics></math></inline-formula>YCu<inline-formula><math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><semantics><msub><mrow></mrow><mn>2</mn></msub></semantics></math></inline-formula>O<inline-formula><math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><semantics><msub><mrow></mrow><mrow><mn>7</mn><mo>+</mo><mi>x</mi></mrow></msub></semantics></math></inline-formula> powder samples oxygenated under high pressure using different concentrations of KClO<inline-formula><math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><semantics><msub><mrow></mrow><mn>3</mn></msub></semantics></math></inline-formula> up to 35 mol %. The analysis of X-ray diffraction data indicates a high purity ∼90% of all samples and suggests that the concentration, <i>x</i>, of extra oxygen atoms increases with increasing KClO<inline-formula><math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><semantics><msub><mrow></mrow><mn>3</mn></msub></semantics></math></inline-formula> concentration. Surprisingly, the <inline-formula><math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><semantics><msub><mi>T</mi><mi>c</mi></msub></semantics></math></inline-formula> values remain nearly constant within the 80–85 K range independent of KClO<inline-formula><math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><semantics><msub><mrow></mrow><mn>3</mn></msub></semantics></math></inline-formula> concentration, which suggests a scenario of <inline-formula><math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><semantics><msub><mi>T</mi><mi>c</mi></msub></semantics></math></inline-formula> saturation. In order to account for this unexpected behaviour, we put forward the hypothesis that overdoping enhances the density of unpaired holes, which is supported by the observation of large values of the Sommerfeld coefficient in all samples. We therefore propose a scenario of electronic phase separation between normal and superconducting holes.https://www.mdpi.com/2410-3896/8/3/56superconducting cupratesoverdopingelectronic phase separation |
| spellingShingle | Amirreza Hemmatzade Elena Medina Ludovic Delbes Benoît Baptiste David Hrabovsky Yannick Klein Steven D. Conradson Maarit Karppinen Andrea Gauzzi <i>T<sub>c</sub></i> Saturation and Possible Electronic Phase Separation in Strongly Overdoped Cuprates Condensed Matter superconducting cuprates overdoping electronic phase separation |
| title | <i>T<sub>c</sub></i> Saturation and Possible Electronic Phase Separation in Strongly Overdoped Cuprates |
| title_full | <i>T<sub>c</sub></i> Saturation and Possible Electronic Phase Separation in Strongly Overdoped Cuprates |
| title_fullStr | <i>T<sub>c</sub></i> Saturation and Possible Electronic Phase Separation in Strongly Overdoped Cuprates |
| title_full_unstemmed | <i>T<sub>c</sub></i> Saturation and Possible Electronic Phase Separation in Strongly Overdoped Cuprates |
| title_short | <i>T<sub>c</sub></i> Saturation and Possible Electronic Phase Separation in Strongly Overdoped Cuprates |
| title_sort | i t sub c sub i saturation and possible electronic phase separation in strongly overdoped cuprates |
| topic | superconducting cuprates overdoping electronic phase separation |
| url | https://www.mdpi.com/2410-3896/8/3/56 |
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