Physics – Condensed Matter – Materials Science
Scientific paper
2007-06-19
Phys. Rev. B 76, 014436 (2007).
Physics
Condensed Matter
Materials Science
REVTeX 4 style; 5 pages, 4 figures
Scientific paper
10.1103/PhysRevB.76.014436
The ac-susceptibility of the electron doped single-layered manganite La$_{1.1}$Sr$_{0.9}$MnO$_4$ is analyzed in detail. A quasi two-dimensional (2$D$) antiferromagnetic (AFM) order with Ising anisotropy is stabilized below $T_N$ $\sim$ 80K. We show that below $T_N$, a rare 2$D$ 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 2$D$ SG, which our experimental data follows fairly well. Due to simplifications in this 2$D$ case, the proposed scaling form only contains two unknown variables $\psi\nu$ and $\tau_0$. 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 2$D$ SG state is also discussed.
Asamitsu A.
He J. P.
Kaneko Yasushi
Mathieu Renaud
Tokura Yasuhiro
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