Unconventional spin order in the triangular lattice system NaCrO2: A neutron scattering study

D. Hsieh; D. Qian; R. F. Berger; R. J. Cava; J. W. Lynn; Q. Huang; M. Z. Hasan

doi:10.1016/j.physb.2007.10.295

Unconventional spin order in the triangular lattice system NaCrO₂: A neutron scattering study

D. Hsieh, D. Qian, R. F. Berger, R. J. Cava, J. W. Lynn, Q. Huang, M. Z. Hasan

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

27 Scopus citations

Abstract

We report high resolution neutron scattering measurements on the rhombohedrally stacked triangular antiferromagnet NaCrO₂ which has recently been shown to exhibit an unusually broad fluctuating cross-over regime extending far below the onset of spin freezing at T_c. Our results show that at T_c purely two-dimensional quasi-static spin correlations of the 120° type exist. Below some cross-over temperature (T ∼ 0.75 T_c) a small incommensuration develops which helps resolve the inter-layer spin frustration and drives short-range three-dimensional magnetic order. This incommensuration assisted dimensional cross-over suggests that inter-layer frustration is responsible for stabilizing the rare 2D correlated phase above 0.75 T_c.

Original language	English (US)
Pages (from-to)	1341-1343
Number of pages	3
Journal	Physica B: Condensed Matter
Volume	403
Issue number	5-9
DOIs	https://doi.org/10.1016/j.physb.2007.10.295
State	Published - Apr 1 2008

All Science Journal Classification (ASJC) codes

Electronic, Optical and Magnetic Materials
Condensed Matter Physics
Electrical and Electronic Engineering

Keywords

Low dimensional magnetism
NaCrO
Neutron scattering
Triangular lattice

Access to Document

10.1016/j.physb.2007.10.295

Cite this

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title = "Unconventional spin order in the triangular lattice system NaCrO2: A neutron scattering study",

abstract = "We report high resolution neutron scattering measurements on the rhombohedrally stacked triangular antiferromagnet NaCrO2 which has recently been shown to exhibit an unusually broad fluctuating cross-over regime extending far below the onset of spin freezing at Tc. Our results show that at Tc purely two-dimensional quasi-static spin correlations of the 120° type exist. Below some cross-over temperature (T ∼ 0.75 Tc) a small incommensuration develops which helps resolve the inter-layer spin frustration and drives short-range three-dimensional magnetic order. This incommensuration assisted dimensional cross-over suggests that inter-layer frustration is responsible for stabilizing the rare 2D correlated phase above 0.75 Tc.",

keywords = "Low dimensional magnetism, NaCrO, Neutron scattering, Triangular lattice",

author = "D. Hsieh and D. Qian and Berger, {R. F.} and Cava, {R. J.} and Lynn, {J. W.} and Q. Huang and Hasan, {M. Z.}",

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T1 - Unconventional spin order in the triangular lattice system NaCrO2

T2 - A neutron scattering study

AU - Hsieh, D.

AU - Qian, D.

AU - Berger, R. F.

AU - Cava, R. J.

AU - Lynn, J. W.

AU - Huang, Q.

AU - Hasan, M. Z.

PY - 2008/4/1

Y1 - 2008/4/1

N2 - We report high resolution neutron scattering measurements on the rhombohedrally stacked triangular antiferromagnet NaCrO2 which has recently been shown to exhibit an unusually broad fluctuating cross-over regime extending far below the onset of spin freezing at Tc. Our results show that at Tc purely two-dimensional quasi-static spin correlations of the 120° type exist. Below some cross-over temperature (T ∼ 0.75 Tc) a small incommensuration develops which helps resolve the inter-layer spin frustration and drives short-range three-dimensional magnetic order. This incommensuration assisted dimensional cross-over suggests that inter-layer frustration is responsible for stabilizing the rare 2D correlated phase above 0.75 Tc.

AB - We report high resolution neutron scattering measurements on the rhombohedrally stacked triangular antiferromagnet NaCrO2 which has recently been shown to exhibit an unusually broad fluctuating cross-over regime extending far below the onset of spin freezing at Tc. Our results show that at Tc purely two-dimensional quasi-static spin correlations of the 120° type exist. Below some cross-over temperature (T ∼ 0.75 Tc) a small incommensuration develops which helps resolve the inter-layer spin frustration and drives short-range three-dimensional magnetic order. This incommensuration assisted dimensional cross-over suggests that inter-layer frustration is responsible for stabilizing the rare 2D correlated phase above 0.75 Tc.

KW - Low dimensional magnetism

KW - NaCrO

KW - Neutron scattering

KW - Triangular lattice

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