Non-Fermi-liquid nature and exotic thermoelectric power in the heavy-fermion superconductor UBe13
| Autor: | Alexandra Palacio-Morales, Georg Knebel, Alexandre Pourret, Yusei Shimizu, Dai Aoki |
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| Přispěvatelé: | Institute for Solid State Physics, University of Tokyo, The University of Tokyo (UTokyo), Instrumentation, Material and Correlated Electrons Physics (IMAPEC), PHotonique, ELectronique et Ingénierie QuantiqueS (PHELIQS), Université Grenoble Alpes [2016-2019] (UGA [2016-2019])-Institut de Recherche Interdisciplinaire de Grenoble (IRIG), Direction de Recherche Fondamentale (CEA) (DRF (CEA)), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Direction de Recherche Fondamentale (CEA) (DRF (CEA)), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Grenoble Alpes [2016-2019] (UGA [2016-2019])-Institut de Recherche Interdisciplinaire de Grenoble (IRIG), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA), Tohoku University [Sendai], European Project: 258239,EC:FP7:ERC,ERC-2010-StG_20091028,NEWHEAVYFERMION(2010) |
| Jazyk: | angličtina |
| Rok vydání: | 2015 |
| Předmět: |
Physics
[PHYS]Physics [physics] Low-Temperature Magnetoresistivity Condensed matter physics Fermi level Phase-Diagram Heavy fermion superconductor Condensed Matter Physics Electronic Optical and Magnetic Materials symbols.namesake Susceptibility Seebeck coefficient CeCu2Si2 Density of states symbols Strongly correlated material Fermi liquid theory Kondo effect Anomaly (physics) High Magnetic-Fields U1-xThxBe13 |
| Zdroj: | Physical Review B: Condensed Matter and Materials Physics (1998-2015) Physical Review B: Condensed Matter and Materials Physics (1998-2015), 2015, 92 (24), pp.241101(R). ⟨10.1103/PhysRevB.92.241101⟩ Physical Review B: Condensed Matter and Materials Physics (1998-2015), American Physical Society, 2015, 92 (24), pp.241101(R). ⟨10.1103/PhysRevB.92.241101⟩ |
| ISSN: | 1098-0121 1550-235X |
| Popis: | We report quite exotic thermoelectric power $S$ in ${\mathrm{UBe}}_{13}$. At 0 T, the negative $S/T$ continues to strongly enhance down to the superconducting transition temperature with no Fermi-liquid behavior. $|S/T|$ is dramatically suppressed and becomes rather modest with increasing field. We have also obtained precise field dependencies of (i) an anomaly in $S$ due to an exotic Kondo effect and (ii) a field-induced anomaly in $S/T$ associated with the anomalous upward ${H}_{\mathrm{c}2}(T)$. In contrast to the field-sensitive transport property, the normal-state specific heat is magnetically robust, indicating that the largeness of the $5f$ density of states remains in high fields. This unusual behavior in ${\mathrm{UBe}}_{13}$ can be explained by a considerable change in the energy derivative of the conduction-electron lifetime ${\ensuremath{\tau}}_{\mathrm{c}}(\ensuremath{\epsilon})$ at the Fermi level under magnetic fields. |
| Databáze: | OpenAIRE |
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