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J. Phys. Soc. Jpn. 77, 074719 (2008) [8 Pages]
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Unique Phase Transition on Spin-2 Triangular Lattice of Ag2MnO2

Hiroyuki Yoshida1, Sascha Ahlert2, Martin Jansen2, Yoshihiko Okamoto1, Jun-Ichi Yamaura1, and Zenji Hiroi1
+ Affiliations
1Institute for Solid State Physics, University of Tokyo, Kashiwa, Chiba 277-85812Max-Planck-Institut für Festköperforschung, Heisenbergstrasse 1, 70569 Stuttgart, Germany
Received December 12, 2007; Accepted April 28, 2008; Published July 10, 2008

Ag 2 MnO 2 is studied as a possible candidate compound for an antiferromagnetic X Y spin model on a triangular lattice. In spite of the large Curie–Weiss temperature of -430 K found in magnetic susceptibility, Mn 3+ spins with S =2 do not undergo a conventional long-range order down to 2 K probably owing to the geometrical frustration and two dimensionality in the system. Instead, a unique phase transition is found at 80 K, where specific heat exhibits a clear sign of a second-order phase transition, while magnetic susceptibility changes smoothly without a distinct anomaly. We think that this transition is related to the chirality degree of freedom associated with a short-range order, which has been expected for the classical X Y spin model on a triangular lattice. On further cooling, spin-glass-like behavior is observed below 22 K, possibly corresponding to a quasi-long-range order.

©2008 The Physical Society of Japan
https://doi.org/10.1143/JPSJ.77.074719
KEYWORDS: triangular lattice, XYspin, frustration, chirality, Ag2MnO2

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