Coexisting Kondo hybridization and itinerant f-electron ferromagnetism in UGe_{2}
Kondo hybridization in partially filled f-electron systems conveys a significant amount of electronic states sharply near the Fermi energy leading to various instabilities from superconductivity to exotic electronic orders. UGe_{2} is a 5f heavy fermion system, where the Kondo hybridization is inter...
| Main Authors: | , , , , , , , , |
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| Format: | Article |
| Language: | English |
| Published: |
American Physical Society
2022-05-01
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| Series: | Physical Review Research |
| Online Access: | http://doi.org/10.1103/PhysRevResearch.4.L022030 |
| _version_ | 1797210748837953536 |
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| author | Ioannis Giannakis Divyanshi Sar Joel Friedman Chang-Jong Kang Marc Janoschek Pinaki Das Eric D. Bauer Gabriel Kotliar Pegor Aynajian |
| author_facet | Ioannis Giannakis Divyanshi Sar Joel Friedman Chang-Jong Kang Marc Janoschek Pinaki Das Eric D. Bauer Gabriel Kotliar Pegor Aynajian |
| author_sort | Ioannis Giannakis |
| collection | DOAJ |
| description | Kondo hybridization in partially filled f-electron systems conveys a significant amount of electronic states sharply near the Fermi energy leading to various instabilities from superconductivity to exotic electronic orders. UGe_{2} is a 5f heavy fermion system, where the Kondo hybridization is interrupted by the formation of two ferromagnetic phases below a second order transition T_{c}∼52K and a crossover transition T_{x}∼32K. These two ferromagnetic phases are concomitantly related to a spin-triplet superconductivity that only emerges and persists inside the magnetically ordered phase at high pressure. The origin of the two ferromagnetic phases and how they form within a Kondo-lattice remain ambiguous. Using scanning tunneling microscopy and spectroscopy, we probe the spatial electronic states in the UGe_{2} as a function of temperature. We find a Kondo resonance and sharp 5f-electron states near the chemical potential that form at high temperatures above T_{c} in accordance with our density functionaltheory+Gutzwiller calculations. As temperature is lowered below T_{c}, the resonance narrows and eventually splits below T_{x} dumping itinerant f-electron spectral weight right at the Fermi energy. Our findings suggest a Stoner mechanism forming the highly polarized ferromagnetic phase below T_{x} that itself sets the stage for the emergence of unconventional superconductivity at high pressure. |
| first_indexed | 2024-04-24T10:15:32Z |
| format | Article |
| id | doaj.art-bcc3c6c8b6a74d4995c2b533a89c5c98 |
| institution | Directory Open Access Journal |
| issn | 2643-1564 |
| language | English |
| last_indexed | 2024-04-24T10:15:32Z |
| publishDate | 2022-05-01 |
| publisher | American Physical Society |
| record_format | Article |
| series | Physical Review Research |
| spelling | doaj.art-bcc3c6c8b6a74d4995c2b533a89c5c982024-04-12T17:20:37ZengAmerican Physical SocietyPhysical Review Research2643-15642022-05-0142L02203010.1103/PhysRevResearch.4.L022030Coexisting Kondo hybridization and itinerant f-electron ferromagnetism in UGe_{2}Ioannis GiannakisDivyanshi SarJoel FriedmanChang-Jong KangMarc JanoschekPinaki DasEric D. BauerGabriel KotliarPegor AynajianKondo hybridization in partially filled f-electron systems conveys a significant amount of electronic states sharply near the Fermi energy leading to various instabilities from superconductivity to exotic electronic orders. UGe_{2} is a 5f heavy fermion system, where the Kondo hybridization is interrupted by the formation of two ferromagnetic phases below a second order transition T_{c}∼52K and a crossover transition T_{x}∼32K. These two ferromagnetic phases are concomitantly related to a spin-triplet superconductivity that only emerges and persists inside the magnetically ordered phase at high pressure. The origin of the two ferromagnetic phases and how they form within a Kondo-lattice remain ambiguous. Using scanning tunneling microscopy and spectroscopy, we probe the spatial electronic states in the UGe_{2} as a function of temperature. We find a Kondo resonance and sharp 5f-electron states near the chemical potential that form at high temperatures above T_{c} in accordance with our density functionaltheory+Gutzwiller calculations. As temperature is lowered below T_{c}, the resonance narrows and eventually splits below T_{x} dumping itinerant f-electron spectral weight right at the Fermi energy. Our findings suggest a Stoner mechanism forming the highly polarized ferromagnetic phase below T_{x} that itself sets the stage for the emergence of unconventional superconductivity at high pressure.http://doi.org/10.1103/PhysRevResearch.4.L022030 |
| spellingShingle | Ioannis Giannakis Divyanshi Sar Joel Friedman Chang-Jong Kang Marc Janoschek Pinaki Das Eric D. Bauer Gabriel Kotliar Pegor Aynajian Coexisting Kondo hybridization and itinerant f-electron ferromagnetism in UGe_{2} Physical Review Research |
| title | Coexisting Kondo hybridization and itinerant f-electron ferromagnetism in UGe_{2} |
| title_full | Coexisting Kondo hybridization and itinerant f-electron ferromagnetism in UGe_{2} |
| title_fullStr | Coexisting Kondo hybridization and itinerant f-electron ferromagnetism in UGe_{2} |
| title_full_unstemmed | Coexisting Kondo hybridization and itinerant f-electron ferromagnetism in UGe_{2} |
| title_short | Coexisting Kondo hybridization and itinerant f-electron ferromagnetism in UGe_{2} |
| title_sort | coexisting kondo hybridization and itinerant f electron ferromagnetism in uge 2 |
| url | http://doi.org/10.1103/PhysRevResearch.4.L022030 |
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