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Reentrant Superspin Glass Phase in a La0.82Ca0.18MnO3 Ferromagnetic Insulator
Uppsala University, Disciplinary Domain of Science and Technology, Technology, Department of Engineering Sciences, Solid State Physics.
Uppsala University, Disciplinary Domain of Science and Technology, Technology, Department of Engineering Sciences, Solid State Physics.
Uppsala University, Disciplinary Domain of Science and Technology, Technology, Department of Engineering Sciences, Solid State Physics.
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2014 (English)In: Physical Review X, ISSN 2160-3308, E-ISSN 2160-3308, Vol. 4, no 1, 011037- p.Article in journal (Refereed) Published
Abstract [en]

We report results of the magnetization and ac susceptibility measurements down to very low fields on a single crystal of the perovskite manganite, La-0.82 Ca-0.18 MnO3. This composition falls in the intriguing ferromagnetic insulator region of the manganite phase diagram. In contrast to earlier beliefs, our investigations reveal that magnetically (and in every other sense), this is a single- phase system with a ferromagnetic ordering temperature of around 170 K. However, this ferromagnetic state is magnetically frustrated, and the system exhibits pronounced glassy dynamics below 90 K. Based on measured dynamical properties, we propose that this quasi-long-ranged ferromagnetic phase, and the associated superspin glass behavior, is the true magnetic state of the system, rather than being a macroscopic mixture of ferromagnetic and antiferromagnetic phases, as often suggested. Our results provide an understanding of the quantum phase transition from an antiferromagnetic insulator to a ferromagnetic metal via this ferromagnetic state as a function of x in La1-xCaxMnO3, in terms of the possible formation of magnetic polarons.

Place, publisher, year, edition, pages
2014. Vol. 4, no 1, 011037- p.
National Category
Physical Sciences Engineering and Technology
Research subject
Engineering Science with specialization in Solid State Physics
Identifiers
URN: urn:nbn:se:uu:diva-223530DOI: 10.1103/PhysRevX.4.011037ISI: 000332762800002OAI: oai:DiVA.org:uu-223530DiVA: diva2:714575
Available from: 2014-04-28 Created: 2014-04-22 Last updated: 2017-12-05Bibliographically approved

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Kumar Puri, AnilMathieu, RolandNordblad, PerKaris, OlofAndersson, GabriellaSarma, Dipankar Das

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Kumar Puri, AnilMathieu, RolandNordblad, PerKaris, OlofAndersson, GabriellaSarma, Dipankar Das
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