| DOI | Trouver le DOI : https://doi.org/10.1103/PhysRevB.73.174407 |
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| Auteur | Rechercher : van Lierop, J.; Rechercher : Voyer, C. J.; Rechercher : Shendruk, T. N.; Rechercher : Ryan, D. H.; Rechercher : Cadogan, J. M.; Rechercher : Cranswick, L.1 |
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| Affiliation | - Conseil national de recherches du Canada. Centre canadien de faisceaux de neutrons du CNRC
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| Format | Texte, Article |
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| Sujet | antiferromagnetic materials; barium compounds; europium compounds; exchange interactions (electron); magnetic moments; Mossbauer effect; spin fluctuations |
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| Résumé | The Ni2+ ions in Eu2BaNiO5 form antiferromagnetic Heisenberg S=1 chains with a Haldane gap. Replacing Ni2+ with Zn2+ decreases the average Ni2+ chain length. 151Eu and 153Eu M�ssbauer spectroscopy have been used to study the chain length dependence of the magnetism in Eu2BaZnxNi1�xO5 with x=0,0.05, and 0.1. Using exchange-induced Eu3+ moments these independent and complementary local probes of the magnetism reveal that the chain moments undergo temperature dependent fluctuations where shorter chain lengths exhibit faster fluctuations at any given temperature. The Eu3+ antiferromagnetic order is established at TN~5 K, independent of the Ni2+ chain length. Thermally activated moment fluctuations are observed above TN. Chain cutting increases the molecular exchange field of the Ni2+ on the Eu3+ and indicates a polarization of Ni2+ interdimer coupling in the quantum spin chains. |
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| Date de publication | 2006-05-05 |
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| Dans | |
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| Langue | anglais |
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| Numéro NPARC | 12333665 |
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| Exporter la notice | Exporter en format RIS |
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| Signaler une correction | Signaler une correction (s'ouvre dans un nouvel onglet) |
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| Identificateur de l’enregistrement | 7c1ec031-0e14-406b-b861-136baf2f729e |
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| Enregistrement créé | 2009-09-10 |
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| Enregistrement modifié | 2020-04-22 |
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