Effect of spin dilution on the magnetic state of delafossite CuCrO 2 with an S = 3/2 antiferromagnetic triangular sublattice

Tetsuji Okuda; Kazuma Uto; Shinichiro Seki; Yoshinori Onose; Yoshinori Tokura; Ryoichi Kajimoto; Masaaki Matsuda

doi:10.1143/JPSJ.80.014711

Effect of spin dilution on the magnetic state of delafossite CuCrO ₂ with an S = 3/2 antiferromagnetic triangular sublattice

Tetsuji Okuda, Kazuma Uto, Shinichiro Seki, Yoshinori Onose, Yoshinori Tokura, Ryoichi Kajimoto, Masaaki Matsuda

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Abstract

We investigated an effect of spin dilution on the magnetic and thermal properties of delafossite CuCrO₂ having an S = 3=2 antiferromagnetic triangular lattice (ATL) by the substitution of Al³⁺ for Cr ³⁺ by measurements of magnetization, specific heat, and neutron scattering. Spin defects introduced into Cr ATL layers blur the antiferromagnetic transition and induce a dimensional crossover of low-energy magnetic excitation in the residual Cr ATL region due to the reduction of inter-layer magnetic interaction, while accompanying an enhancement of a spin-glass component. The observed T² contribution to the low-T C_mag above y = 0:15, as well as in Cu_0:85Ag _0:15CrO₂, comes mainly from a short-range 2D AF excitation originating in a nontrivial magnetic state such as spin-nematic or spinliquid states.

Original language	English
Article number	014711
Journal	Journal of the Physical Society of Japan
Volume	80
Issue number	1
DOIs	https://doi.org/10.1143/JPSJ.80.014711
State	Published - Jan 2011

Keywords

Antiferromagnetic triangular lattice
Delafossite oxide

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10.1143/JPSJ.80.014711

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title = "Effect of spin dilution on the magnetic state of delafossite CuCrO 2 with an S = 3/2 antiferromagnetic triangular sublattice",

abstract = "We investigated an effect of spin dilution on the magnetic and thermal properties of delafossite CuCrO2 having an S = 3=2 antiferromagnetic triangular lattice (ATL) by the substitution of Al3+ for Cr 3+ by measurements of magnetization, specific heat, and neutron scattering. Spin defects introduced into Cr ATL layers blur the antiferromagnetic transition and induce a dimensional crossover of low-energy magnetic excitation in the residual Cr ATL region due to the reduction of inter-layer magnetic interaction, while accompanying an enhancement of a spin-glass component. The observed T2 contribution to the low-T Cmag above y = 0:15, as well as in Cu0:85Ag 0:15CrO2, comes mainly from a short-range 2D AF excitation originating in a nontrivial magnetic state such as spin-nematic or spinliquid states.",

keywords = "Antiferromagnetic triangular lattice, Delafossite oxide",

author = "Tetsuji Okuda and Kazuma Uto and Shinichiro Seki and Yoshinori Onose and Yoshinori Tokura and Ryoichi Kajimoto and Masaaki Matsuda",

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language = "English",

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T1 - Effect of spin dilution on the magnetic state of delafossite CuCrO 2 with an S = 3/2 antiferromagnetic triangular sublattice

AU - Okuda, Tetsuji

AU - Uto, Kazuma

AU - Seki, Shinichiro

AU - Onose, Yoshinori

AU - Tokura, Yoshinori

AU - Kajimoto, Ryoichi

AU - Matsuda, Masaaki

PY - 2011/1

Y1 - 2011/1

N2 - We investigated an effect of spin dilution on the magnetic and thermal properties of delafossite CuCrO2 having an S = 3=2 antiferromagnetic triangular lattice (ATL) by the substitution of Al3+ for Cr 3+ by measurements of magnetization, specific heat, and neutron scattering. Spin defects introduced into Cr ATL layers blur the antiferromagnetic transition and induce a dimensional crossover of low-energy magnetic excitation in the residual Cr ATL region due to the reduction of inter-layer magnetic interaction, while accompanying an enhancement of a spin-glass component. The observed T2 contribution to the low-T Cmag above y = 0:15, as well as in Cu0:85Ag 0:15CrO2, comes mainly from a short-range 2D AF excitation originating in a nontrivial magnetic state such as spin-nematic or spinliquid states.

AB - We investigated an effect of spin dilution on the magnetic and thermal properties of delafossite CuCrO2 having an S = 3=2 antiferromagnetic triangular lattice (ATL) by the substitution of Al3+ for Cr 3+ by measurements of magnetization, specific heat, and neutron scattering. Spin defects introduced into Cr ATL layers blur the antiferromagnetic transition and induce a dimensional crossover of low-energy magnetic excitation in the residual Cr ATL region due to the reduction of inter-layer magnetic interaction, while accompanying an enhancement of a spin-glass component. The observed T2 contribution to the low-T Cmag above y = 0:15, as well as in Cu0:85Ag 0:15CrO2, comes mainly from a short-range 2D AF excitation originating in a nontrivial magnetic state such as spin-nematic or spinliquid states.

KW - Antiferromagnetic triangular lattice

KW - Delafossite oxide

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U2 - 10.1143/JPSJ.80.014711

DO - 10.1143/JPSJ.80.014711

M3 - Article

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SN - 0031-9015

VL - 80

JO - Journal of the Physical Society of Japan

JF - Journal of the Physical Society of Japan

IS - 1

M1 - 014711

ER -

Effect of spin dilution on the magnetic state of delafossite CuCrO ₂ with an S = 3/2 antiferromagnetic triangular sublattice

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