Magnetic fluctuations in Eu[sub 2]BaZn[sub x]Ni[sub 1 - x]O[sub 5] Haldane systems

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DOIResolve DOI: http://doi.org/10.1103/PhysRevB.73.174407
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TypeArticle
Journal titlePhysical Review B : Condensed Matter and Materials Physics
Volume73
Issue17
Pages174407-1174407-8; # of pages: 8
Subjectantiferromagnetic materials; barium compounds; europium compounds; exchange interactions (electron); magnetic moments; Mossbauer effect; spin fluctuations
AbstractThe 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.
Publication date
LanguageEnglish
AffiliationNational Research Council Canada; NRC Canadian Neutron Beam Centre
Peer reviewedNo
NPARC number12333665
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Record identifier7c1ec031-0e14-406b-b861-136baf2f729e
Record created2009-09-10
Record modified2016-05-09
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