Electronic spin susceptibility in metallic strontium titanate
Abstract Metallic strontium titanate (SrTiO3) is known to have both normal-state and superconducting properties that strongly vary over a wide range of charge carrier densities, but the complex interplay between lattice and electronic degrees of freedom has hindered the development of a clear qualit...
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| Format: | Article |
| Language: | English |
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Nature Portfolio
2025-01-01
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| Series: | npj Quantum Materials |
| Online Access: | https://doi.org/10.1038/s41535-024-00722-7 |
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| author | A. Najev N. Somun M. Spaić I. Khayr M. Greven A. Klein M. N. Gastiasoro D. Pelc |
| author_facet | A. Najev N. Somun M. Spaić I. Khayr M. Greven A. Klein M. N. Gastiasoro D. Pelc |
| author_sort | A. Najev |
| collection | DOAJ |
| description | Abstract Metallic strontium titanate (SrTiO3) is known to have both normal-state and superconducting properties that strongly vary over a wide range of charge carrier densities, but the complex interplay between lattice and electronic degrees of freedom has hindered the development of a clear qualitative description of the observed behavior. A major challenge is to understand how the charge carriers themselves evolve with doping and temperature, with possible polaronic effects and evidence of an effective mass that strongly increases with temperature. Here we use 47,49Ti nuclear magnetic resonance (NMR) to perform a comprehensive study of the electronic spin susceptibility in the metallic state of strontium titanate across the doping-temperature phase diagram. We find a temperature-dependent Knight shift that can be quantitatively understood within a nondegenerate Fermi gas model that fully takes into account the complex band structure of SrTiO3. Our data are consistent with a temperature-independent effective mass, and we show that the behavior of the spin susceptibility is universal in a wide range of temperatures and carrier concentrations. These results provide a microscopic foundation for the understanding of the properties of the unconventional low-density metallic state in strontium titanate and related materials. |
| format | Article |
| id | doaj-art-44d60a1a00a643ef93b9dcbe0bf678ec |
| institution | Kabale University |
| issn | 2397-4648 |
| language | English |
| publishDate | 2025-01-01 |
| publisher | Nature Portfolio |
| record_format | Article |
| series | npj Quantum Materials |
| spelling | doaj-art-44d60a1a00a643ef93b9dcbe0bf678ec2025-01-12T12:07:01ZengNature Portfolionpj Quantum Materials2397-46482025-01-011011810.1038/s41535-024-00722-7Electronic spin susceptibility in metallic strontium titanateA. Najev0N. Somun1M. Spaić2I. Khayr3M. Greven4A. Klein5M. N. Gastiasoro6D. Pelc7Department of Physics, Faculty of Science, University of ZagrebDepartment of Physics, Faculty of Science, University of ZagrebDepartment of Physics, Faculty of Science, University of ZagrebSchool of Physics and Astronomy, University of MinnesotaSchool of Physics and Astronomy, University of MinnesotaDepartment of Physics, Faculty of Natural Sciences, Ariel UniversityDonostia International Physics CenterDepartment of Physics, Faculty of Science, University of ZagrebAbstract Metallic strontium titanate (SrTiO3) is known to have both normal-state and superconducting properties that strongly vary over a wide range of charge carrier densities, but the complex interplay between lattice and electronic degrees of freedom has hindered the development of a clear qualitative description of the observed behavior. A major challenge is to understand how the charge carriers themselves evolve with doping and temperature, with possible polaronic effects and evidence of an effective mass that strongly increases with temperature. Here we use 47,49Ti nuclear magnetic resonance (NMR) to perform a comprehensive study of the electronic spin susceptibility in the metallic state of strontium titanate across the doping-temperature phase diagram. We find a temperature-dependent Knight shift that can be quantitatively understood within a nondegenerate Fermi gas model that fully takes into account the complex band structure of SrTiO3. Our data are consistent with a temperature-independent effective mass, and we show that the behavior of the spin susceptibility is universal in a wide range of temperatures and carrier concentrations. These results provide a microscopic foundation for the understanding of the properties of the unconventional low-density metallic state in strontium titanate and related materials.https://doi.org/10.1038/s41535-024-00722-7 |
| spellingShingle | A. Najev N. Somun M. Spaić I. Khayr M. Greven A. Klein M. N. Gastiasoro D. Pelc Electronic spin susceptibility in metallic strontium titanate npj Quantum Materials |
| title | Electronic spin susceptibility in metallic strontium titanate |
| title_full | Electronic spin susceptibility in metallic strontium titanate |
| title_fullStr | Electronic spin susceptibility in metallic strontium titanate |
| title_full_unstemmed | Electronic spin susceptibility in metallic strontium titanate |
| title_short | Electronic spin susceptibility in metallic strontium titanate |
| title_sort | electronic spin susceptibility in metallic strontium titanate |
| url | https://doi.org/10.1038/s41535-024-00722-7 |
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