| DOI | Resolve DOI: https://doi.org/10.1103/PhysRevB.73.174407 |
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| Author | Search for: van Lierop, J.; Search for: Voyer, C. J.; Search for: Shendruk, T. N.; Search for: Ryan, D. H.; Search for: Cadogan, J. M.; Search for: Cranswick, L.1 |
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| Affiliation | - National Research Council of Canada. NRC Canadian Neutron Beam Centre
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| Format | Text, Article |
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| Subject | antiferromagnetic materials; barium compounds; europium compounds; exchange interactions (electron); magnetic moments; Mossbauer effect; spin fluctuations |
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| Abstract | 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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| Publication date | 2006-05-05 |
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| In | |
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| Language | English |
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| NPARC number | 12333665 |
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| Export citation | Export as RIS |
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| Report a correction | Report a correction (opens in a new tab) |
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| Record identifier | 7c1ec031-0e14-406b-b861-136baf2f729e |
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| Record created | 2009-09-10 |
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| Record modified | 2020-04-22 |
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