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Logarithmic growth law in the two-dimensional Ising spin glass state resulting from the electron doping in single-layered manganites
KTH, School of Information and Communication Technology (ICT), Microelectronics and Applied Physics, MAP.
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2007 (English)In: Physical Review B. Condensed Matter and Materials Physics, ISSN 1098-0121, E-ISSN 1550-235X, Vol. 76, no 1, 014436- p.Article in journal (Refereed) Published
Abstract [en]

The ac susceptibility of the electron-doped single-layered manganite La1.1 Sr0.9 Mn O4 is analyzed in detail. A quasi-two-dimensional antiferromagnetic (AFM) order with Ising anisotropy is stabilized below TN ∼80 K. We show that below TN, a rare two-dimensional (2D) spin-glass (SG) correlation develops with the same Ising anisotropy as the AFM state. Using simple scaling arguments of the droplet model, we derive a scaling form for the ac susceptibility data of a 2D SG, which our experimental data follow fairly well. Due to simplifications in this 2D case, the proposed scaling form only contains two unknown variables, ψν and τ0. Hence, the logarithmic growth law of the SG correlation predicted by the droplet model is convincingly evidenced by the scaling of our experimental data. The origin and nature of this 2D SG state are also discussed.

Place, publisher, year, edition, pages
2007. Vol. 76, no 1, 014436- p.
Keyword [en]
Dynamics, Films, Cumn, Behavior, Oxides, System
National Category
Physical Sciences
URN: urn:nbn:se:kth:diva-155613DOI: 10.1103/PhysRevB.76.014436ISI: 000248487900093ScopusID: 2-s2.0-34547511917OAI: diva2:761700

QC 20141107

Available from: 2014-11-07 Created: 2014-11-07 Last updated: 2014-11-07Bibliographically approved

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Mathieu, Roland
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