| Autor: |
Justin, Jeanneau, Pierre, Toulemonde, Gyorgy, Remenyi, André, Sulpice, Claire, Colin, Vivian, Nassif, Emmanuelle, Suard, Eduardo, Salas Colera, Germán R, Castro, Frederic, Gay, Corina, Urdaniz, Ruben, Weht, Clement, Fevrier, Arnaud, Ralko, Claudine, Lacroix, Armando A, Aligia, Manuel, Núñez-Regueiro |
| Rok vydání: |
2016 |
| Zdroj: |
Physical review letters. 118(20) |
| ISSN: |
1079-7114 |
| Popis: |
We perform an extensive study of Sr_{3}Cr_{2}O_{7}, the n=2 member of the Ruddlesden-Popper Sr_{n+1}Cr_{n}O_{3n+1} system. An antiferromagnetic ordering is clearly visible in the magnetization and the specific heat, which yields a huge transition entropy, Rln(6). By neutron diffraction as a function of temperature we have determined the antiferromagnetic structure that coincides with the one obtained from density functional theory calculations. It is accompanied by anomalous asymmetric distortions of the CrO_{6} octahedra. Strong coupling and Lanczos calculations on a derived Kugel-Khomskii Hamiltonian yield a simultaneous orbital and moment ordering. Our results favor an exotic ordered phase of orbital singlets not originated by frustration. |
| Databáze: |
OpenAIRE |
| Externí odkaz: |
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