Spin glassiness and power law scaling in anisotropic triangular spin-1/2 antiferromagnets

Jian Wu; Julia S. Wildeboer; Fletcher Werner; Alexander Seidel; Z. Nussinov; S. A. Solin

doi:10.1209/0295-5075/93/67001

Spin glassiness and power law scaling in anisotropic triangular spin-1/2 antiferromagnets

Jian Wu
, Julia S. Wildeboer
, Fletcher Werner
, Alexander Seidel
, Z. Nussinov
, S. A. Solin

Department of Physics

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

5 Scopus citations

Abstract

We present data on the magnetic properties of two classes of layered spin S=1/2 antiferromagnetic quasi-triangular lattice materials: Cu _2(1-x)Zn_2x(OH)₃NO₃(0≤x≤0.65) and its long-organic-chain-intercalated derivatives Cu_2(1-x)Zn _2x(OH)₃(C₇H₁₅COO)mH ₂O(0≤x≤0.29), where non-magnetic Zn substitutes for Cu isostructurally. It is found that the intercalated compounds, even in a clean system in the absence of dilution, x=0, show spin glass behaviour, as evidenced by DC and AC susceptibility, and by time-dependent magnetization measurements. A striking feature is the observation of a sharp crossover between two successive power law regimes in the DC susceptibility above the freezing temperature. In constrast to standard theoretical expectations, these power laws are insensitive to doping. Specific heat data are consistent with a conventional phase transition in the unintercalated compounds, and glassy behaviour in the intercalated compounds.

Original language	English
Article number	67001
Journal	EPL
Volume	93
Issue number	6
DOIs	https://doi.org/10.1209/0295-5075/93/67001
State	Published - Mar 2011

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@article{ade37a59761a48cc876a6c507d148917,

title = "Spin glassiness and power law scaling in anisotropic triangular spin-1/2 antiferromagnets",

abstract = "We present data on the magnetic properties of two classes of layered spin S=1/2 antiferromagnetic quasi-triangular lattice materials: Cu 2(1-x)Zn2x(OH)3NO3(0≤x≤0.65) and its long-organic-chain-intercalated derivatives Cu2(1-x)Zn 2x(OH)3(C7H15COO)mH 2O(0≤x≤0.29), where non-magnetic Zn substitutes for Cu isostructurally. It is found that the intercalated compounds, even in a clean system in the absence of dilution, x=0, show spin glass behaviour, as evidenced by DC and AC susceptibility, and by time-dependent magnetization measurements. A striking feature is the observation of a sharp crossover between two successive power law regimes in the DC susceptibility above the freezing temperature. In constrast to standard theoretical expectations, these power laws are insensitive to doping. Specific heat data are consistent with a conventional phase transition in the unintercalated compounds, and glassy behaviour in the intercalated compounds.",

author = "Jian Wu and Wildeboer, \{Julia S.\} and Fletcher Werner and Alexander Seidel and Z. Nussinov and Solin, \{S. A.\}",

year = "2011",

month = mar,

doi = "10.1209/0295-5075/93/67001",

language = "English",

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TY - JOUR

T1 - Spin glassiness and power law scaling in anisotropic triangular spin-1/2 antiferromagnets

AU - Wu, Jian

AU - Wildeboer, Julia S.

AU - Werner, Fletcher

AU - Seidel, Alexander

AU - Nussinov, Z.

AU - Solin, S. A.

PY - 2011/3

Y1 - 2011/3

N2 - We present data on the magnetic properties of two classes of layered spin S=1/2 antiferromagnetic quasi-triangular lattice materials: Cu 2(1-x)Zn2x(OH)3NO3(0≤x≤0.65) and its long-organic-chain-intercalated derivatives Cu2(1-x)Zn 2x(OH)3(C7H15COO)mH 2O(0≤x≤0.29), where non-magnetic Zn substitutes for Cu isostructurally. It is found that the intercalated compounds, even in a clean system in the absence of dilution, x=0, show spin glass behaviour, as evidenced by DC and AC susceptibility, and by time-dependent magnetization measurements. A striking feature is the observation of a sharp crossover between two successive power law regimes in the DC susceptibility above the freezing temperature. In constrast to standard theoretical expectations, these power laws are insensitive to doping. Specific heat data are consistent with a conventional phase transition in the unintercalated compounds, and glassy behaviour in the intercalated compounds.

AB - We present data on the magnetic properties of two classes of layered spin S=1/2 antiferromagnetic quasi-triangular lattice materials: Cu 2(1-x)Zn2x(OH)3NO3(0≤x≤0.65) and its long-organic-chain-intercalated derivatives Cu2(1-x)Zn 2x(OH)3(C7H15COO)mH 2O(0≤x≤0.29), where non-magnetic Zn substitutes for Cu isostructurally. It is found that the intercalated compounds, even in a clean system in the absence of dilution, x=0, show spin glass behaviour, as evidenced by DC and AC susceptibility, and by time-dependent magnetization measurements. A striking feature is the observation of a sharp crossover between two successive power law regimes in the DC susceptibility above the freezing temperature. In constrast to standard theoretical expectations, these power laws are insensitive to doping. Specific heat data are consistent with a conventional phase transition in the unintercalated compounds, and glassy behaviour in the intercalated compounds.

UR - https://www.scopus.com/pages/publications/79953650691

U2 - 10.1209/0295-5075/93/67001

DO - 10.1209/0295-5075/93/67001

M3 - Article

AN - SCOPUS:79953650691

SN - 0295-5075

VL - 93

JO - EPL

JF - EPL

IS - 6

M1 - 67001

ER -

Spin glassiness and power law scaling in anisotropic triangular spin-1/2 antiferromagnets

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