Magnetothermopower in Nd1-xEuxNiO3 compounds

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dc.contributor.authorBarbeta V.B.
dc.contributor.authorJardim R.F.
dc.contributor.authorEscote M.T.
dc.contributor.authorDilley N.R.
dc.date.accessioned2019-08-19T23:47:28Z
dc.date.available2019-08-19T23:47:28Z
dc.date.issued2007
dc.description.abstractWe have measured magnetization M (T,H), thermal conductivity κ (T,H), and thermopower S (T,H) of polycrystalline samples of Nd1-x Eux Ni O3, 0≤x≤0.35, as a function of temperature and external magnetic field. The data indicate a metal-insulator (MI) transition in a wide range of temperature (200< TMI <325 K). The magnetic susceptibility (T) data, after the subtraction of the rare-earth contribution, exhibit a Curie-Weiss-like behavior at temperatures above TMI. Although a clear antiferromagnetic AF transition of the Ni sublattice is observed at TN ≤ TMI, (T) still increases down to 5 K, suggesting a heterogeneous ground state. The thermal conductivity of the NdNi O3 compound is not affected by an external magnetic field of 90 kOe in a wide range of temperature, and its temperature dependence below 15 K is approximately quadratic, strongly suggesting the presence of disorder. S (T) is negative above TMI and varies linearly with temperature. Below TMI, there is a minimum close to 120 K, and S (T) changes its sign at T∼30 K, indicating a competition between two types of charge carriers. A pronounced peak in S (T) at TS ∼20 K is observed and the peak remains unaltered under magnetic fields up to 90 kOe. However, its magnitude is enhanced by ∼25% with applied magnetic field, exhibiting a clear magnetothermopower effect. The combined results indicate a coexistence of ordered and disordered phases below TN and that an applied magnetic field is suitable for enhancing the thermoelectric properties close to TS. © 2007 American Institute of Physics.
dc.description.firstpage09N509
dc.description.issuenumber9
dc.description.volume101
dc.identifier.citationBarbeta, V. B.; JARDIM, R. F.; ESCOTE, M. T.; DILLEY, N. R.. Magnetothermopower in Nd[sub 1−x]Eu[sub x]NiO[sub 3] compounds. Journal of Applied Physics, v. 101, n. 9, p. 09N509, 2007.
dc.identifier.doi10.1063/1.2710738
dc.identifier.issn0021-8979
dc.identifier.urihttps://repositorio.fei.edu.br/handle/FEI/1574
dc.relation.ispartofJournal of Applied Physics
dc.rightsAcesso Restrito
dc.titleMagnetothermopower in Nd1-xEuxNiO3 compounds
dc.typeArtigo de evento
fei.scopus.citations2
fei.scopus.eid2-s2.0-34248572165
fei.scopus.subjectMagnetothermopower effects
fei.scopus.subjectMetal insulators (MI)
fei.scopus.subjectRare earth contribution
fei.scopus.updated2024-12-01
fei.scopus.urlhttps://www.scopus.com/inward/record.uri?partnerID=HzOxMe3b&scp=34248572165&origin=inward
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