Origin of the Spin-Orbital Liquid State in a Nearly J=0 Iridate Ba3ZnIr2O9
| Autor: | Abhishek, Nag, S, Middey, Sayantika, Bhowal, S K, Panda, Roland, Mathieu, J C, Orain, F, Bert, P, Mendels, P G, Freeman, M, Mansson, H M, Ronnow, M, Telling, P K, Biswas, D, Sheptyakov, S D, Kaushik, Vasudeva, Siruguri, Carlo, Meneghini, D D, Sarma, Indra, Dasgupta, Sugata, Ray |
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| Přispěvatelé: | Nag, Abhishek, Middey, S., Bhowal, Sayantika, Panda, S. K., Mathieu, Roland, Orain, J. C., Bert, F., Mendels, P., Freeman, P. G., Mansson, M., Ronnow, H. M., Telling, M., Biswas, P. K., Sheptyakov, D., Kaushik, S. D., Siruguri, Vasudeva, Meneghini, Carlo, Sarma, D. D., Dasgupta, Indra, Ray, Sugata |
| Rok vydání: | 2016 |
| Předmět: | |
| Zdroj: | Physical Review Letters PHYSICAL REVIEW LETTERS |
| Popis: | We show using detailed magnetic and thermodynamic studies and theoretical calculations that the ground state of Ba_{3}ZnIr_{2}O_{9} is a realization of a novel spin-orbital liquid state. Our results reveal that Ba_{3}ZnIr_{2}O_{9} with Ir^{5+} (5d^{4}) ions and strong spin-orbit coupling (SOC) arrives very close to the elusive J=0 state but each Ir ion still possesses a weak moment. Ab initio density functional calculations indicate that this moment is developed due to superexchange, mediated by a strong intradimer hopping mechanism. While the Ir spins within the structural Ir_{2}O_{9} dimer are expected to form a spin-orbit singlet state (SOS) with no resultant moment, substantial frustration arising from interdimer exchange interactions induce quantum fluctuations in these possible SOS states favoring a spin-orbital liquid phase down to at least 100 mK. |
| Databáze: | OpenAIRE |
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