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Three-dimensional Ising critical behavior in R0.6Sr0.4MnO3(R=Pr,Nd) manganites

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Oleaga, A., Salazar, A., Ciomaga Hatnean, Monica and Balakrishnan, Geetha (2015) Three-dimensional Ising critical behavior in R0.6Sr0.4MnO3(R=Pr,Nd) manganites. Physical Review B, 92 (2). 024409. doi:10.1103/PhysRevB.92.024409 ISSN 1098-0121.

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Official URL: http://dx.doi.org/10.1103/PhysRevB.92.024409

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Abstract

Magnetic as well as calorimetric measurements have been performed on single crystal samples of Pr0.6Sr0.4MnO3 and Nd0.6Sr0.4MnO3 to develop a complete critical behavior study of the paramagnetic to ferromagnetic transition in both manganites. The critical exponents α,β,γ , and δ have been independently obtained. For Pr0.6Sr0.4MnO3, these are α = 0.09, β = 0.312, γ = 1.106, and δ = 4.545, while for Nd0.6Sr0.4MnO3 they are α = 0.11, β = 0.308, γ = 1.172, and δ = 4.75. All these values agree with the three-dimensional (3D)-Ising universality class (α = 0.11, β = 0.3265, γ = 1.237, and δ = 4.79) and are very far away from any other known universality class. This suggests the presence of magnetocrystalline anisotropies in the system that must be taken into account to fully describe the magnetism of these manganites, which deviates from a simple double exchange model.

Item Type: Journal Article
Subjects: Q Science > QC Physics
Q Science > QE Geology
Divisions: Faculty of Science, Engineering and Medicine > Science > Physics
Library of Congress Subject Headings (LCSH): Manganite, Paramagnetism, Ferromagnetism, Anisotropy
Journal or Publication Title: Physical Review B
Publisher: American Physical Society
ISSN: 1098-0121
Official Date: 13 July 2015
Dates:
DateEvent
13 July 2015Published
25 June 2015Accepted
Volume: 92
Number: 2
Article Number: 024409
DOI: 10.1103/PhysRevB.92.024409
Status: Peer Reviewed
Publication Status: Published
Access rights to Published version: Restricted or Subscription Access
Copyright Holders: American Physical Society
Date of first compliant deposit: 24 April 2017
Date of first compliant Open Access: 25 April 2017
Funder: Spain. Ministerio de Ciencia e Innovación (MICINN), Federación Española de Enfermedades Raras (FEDER), Universidad del País Vasco (UPV), Engineering and Physical Sciences Research Council (EPSRC)
Grant number: MAT2011-23811 (MICINN), IT619-13 (FEDER), UFI11/55 (UPV), EP/I007210/1 (EPSRC)

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