Dielectric and magnetic anomalies and spin frustration in hexagonal RMnO3 (R=Y, Yb, and Lu)

T. Katsufuji; S. Mori; M. Masaki; Y. Moritomo; N. Yamamoto; H. Takagi

Dielectric and magnetic anomalies and spin frustration in hexagonal RMnO₃ (R=Y, Yb, and Lu)

T. Katsufuji^*, S. Mori, M. Masaki, Y. Moritomo, N. Yamamoto, H. Takagi

^*Corresponding author for this work

Research output: Contribution to journal › Article › peer-review

442 Citations (Scopus)

Abstract

Single crystals of hexagonal RMnO₃ (R=Y, Yb, and Lu), where Mn ions form the triangular lattice, were investigated, focusing on their dielectric/magnetic anomalies as well as geometrical spin frustration. It is found that the ratio of a Weiss temperature to T_N is ∼10 in RMnO₃, indicating the dominant role of strong geometrical frustration. The effect of geometrical frustration also appears in specific heat, which shows a presence of a substantial amount of residual magnetic contribution below T_N, indicating that a part of the spins are still fluctuating at T≪T_N. It is also found that the dielectric anomaly at T_N is strongly anisotropic, suggesting a unique correlation between magnetism and dielectric properties in these compounds.

Original language	English
Article number	104419
Pages (from-to)	1044191-1044196
Number of pages	6
Journal	Physical Review B - Condensed Matter and Materials Physics
Volume	64
Issue number	10
Publication status	Published - 2001 Sept 1
Externally published	Yes

ASJC Scopus subject areas

Electronic, Optical and Magnetic Materials
Condensed Matter Physics

Cite this

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abstract = "Single crystals of hexagonal RMnO3 (R=Y, Yb, and Lu), where Mn ions form the triangular lattice, were investigated, focusing on their dielectric/magnetic anomalies as well as geometrical spin frustration. It is found that the ratio of a Weiss temperature to TN is ∼10 in RMnO3, indicating the dominant role of strong geometrical frustration. The effect of geometrical frustration also appears in specific heat, which shows a presence of a substantial amount of residual magnetic contribution below TN, indicating that a part of the spins are still fluctuating at T≪TN. It is also found that the dielectric anomaly at TN is strongly anisotropic, suggesting a unique correlation between magnetism and dielectric properties in these compounds.",

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T1 - Dielectric and magnetic anomalies and spin frustration in hexagonal RMnO3 (R=Y, Yb, and Lu)

AU - Katsufuji, T.

AU - Mori, S.

AU - Masaki, M.

AU - Moritomo, Y.

AU - Yamamoto, N.

AU - Takagi, H.

PY - 2001/9/1

Y1 - 2001/9/1

N2 - Single crystals of hexagonal RMnO3 (R=Y, Yb, and Lu), where Mn ions form the triangular lattice, were investigated, focusing on their dielectric/magnetic anomalies as well as geometrical spin frustration. It is found that the ratio of a Weiss temperature to TN is ∼10 in RMnO3, indicating the dominant role of strong geometrical frustration. The effect of geometrical frustration also appears in specific heat, which shows a presence of a substantial amount of residual magnetic contribution below TN, indicating that a part of the spins are still fluctuating at T≪TN. It is also found that the dielectric anomaly at TN is strongly anisotropic, suggesting a unique correlation between magnetism and dielectric properties in these compounds.

AB - Single crystals of hexagonal RMnO3 (R=Y, Yb, and Lu), where Mn ions form the triangular lattice, were investigated, focusing on their dielectric/magnetic anomalies as well as geometrical spin frustration. It is found that the ratio of a Weiss temperature to TN is ∼10 in RMnO3, indicating the dominant role of strong geometrical frustration. The effect of geometrical frustration also appears in specific heat, which shows a presence of a substantial amount of residual magnetic contribution below TN, indicating that a part of the spins are still fluctuating at T≪TN. It is also found that the dielectric anomaly at TN is strongly anisotropic, suggesting a unique correlation between magnetism and dielectric properties in these compounds.

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Dielectric and magnetic anomalies and spin frustration in hexagonal RMnO₃ (R=Y, Yb, and Lu)

Abstract

ASJC Scopus subject areas

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