Unconventional spin freezing in the highly two-dimensional spin- 1 2 kagome antiferromagnet Cd 2 Cu 3 (OH) 6 (SO 4) 2 4H 2 O: Evidence of partial order and coexisting spin singlet state on a distorted kagome lattice

Masayoshi Fujihala, Xu Guang Zheng, Hiroki Morodomi, Tatsuya Kawae, Akira Matsuo, Koichi Kindo, Isao Watanabe

Research output: Contribution to journalArticle

6 Citations (Scopus)

Abstract

S = 1/2 quantum-spin systems of the kagome lattice have received intense recent attention because they are expected to be promising candidates for novel quantum states such as spin liquid, spin nematic, and other unknown exotic states. Here we report an unusual transition in a highly two-dimensional and slightly distorted S = 1/2 quantum kagome system Cd2Cu3(OH)6(SO4)24H2O, which is a purified compound of the recently identified mineral edwardsite, Cd1.89Zn0.11Cu3(OH)6(SO4)24H2O. The S = 1/2 spins of Cu2+ ions form a highly two-dimensional kagome lattice with an extraordinarily large interlayer spacing >10 Å, thus providing a unique kagome lattice with minimum interlayer perturbation. The magnetization shows a Curie-Weiss temperature of 40.5 K and moment freezing below around TF = 5 K and a magnetic transition feature near 3 K. The muon spin relaxation shows static magnetism below 5 K and saturation below 3 K. However, distinct features have been observed distinguishing it from a spin glass or a conventional order: High-field magnetization until 50 T showed a saturated value of only 1/3 of the full expected moment. Analysis of specific heat suggests that only 1/3 of the spins are related to the magnetic order; on the other hand, the order is destroyed in external field and 1/3 of the spins respond to the field with a Schottky-like behavior while the other 2/3 of the spins remain inactive. These experimental results suggest an unconventional coexistence of the partial order and most probably spin singlets.

Original languageEnglish
Article number100401
JournalPhysical Review B - Condensed Matter and Materials Physics
Volume89
Issue number10
DOIs
Publication statusPublished - Mar 6 2014

Fingerprint

Freezing
freezing
Magnetization
Spin glass
Magnetism
Curie temperature
Specific heat
Minerals
Ions
Liquids
interlayers
moments
magnetization
spin glass
muons
spacing
minerals
specific heat
saturation
perturbation

All Science Journal Classification (ASJC) codes

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics

Cite this

Unconventional spin freezing in the highly two-dimensional spin- 1 2 kagome antiferromagnet Cd 2 Cu 3 (OH) 6 (SO 4) 2 4H 2 O : Evidence of partial order and coexisting spin singlet state on a distorted kagome lattice. / Fujihala, Masayoshi; Zheng, Xu Guang; Morodomi, Hiroki; Kawae, Tatsuya; Matsuo, Akira; Kindo, Koichi; Watanabe, Isao.

In: Physical Review B - Condensed Matter and Materials Physics, Vol. 89, No. 10, 100401, 06.03.2014.

Research output: Contribution to journalArticle

@article{633222e06515477dab67643febd47115,
title = "Unconventional spin freezing in the highly two-dimensional spin- 1 2 kagome antiferromagnet Cd 2 Cu 3 (OH) 6 (SO 4) 2 4H 2 O: Evidence of partial order and coexisting spin singlet state on a distorted kagome lattice",
abstract = "S = 1/2 quantum-spin systems of the kagome lattice have received intense recent attention because they are expected to be promising candidates for novel quantum states such as spin liquid, spin nematic, and other unknown exotic states. Here we report an unusual transition in a highly two-dimensional and slightly distorted S = 1/2 quantum kagome system Cd2Cu3(OH)6(SO4)24H2O, which is a purified compound of the recently identified mineral edwardsite, Cd1.89Zn0.11Cu3(OH)6(SO4)24H2O. The S = 1/2 spins of Cu2+ ions form a highly two-dimensional kagome lattice with an extraordinarily large interlayer spacing >10 {\AA}, thus providing a unique kagome lattice with minimum interlayer perturbation. The magnetization shows a Curie-Weiss temperature of 40.5 K and moment freezing below around TF = 5 K and a magnetic transition feature near 3 K. The muon spin relaxation shows static magnetism below 5 K and saturation below 3 K. However, distinct features have been observed distinguishing it from a spin glass or a conventional order: High-field magnetization until 50 T showed a saturated value of only 1/3 of the full expected moment. Analysis of specific heat suggests that only 1/3 of the spins are related to the magnetic order; on the other hand, the order is destroyed in external field and 1/3 of the spins respond to the field with a Schottky-like behavior while the other 2/3 of the spins remain inactive. These experimental results suggest an unconventional coexistence of the partial order and most probably spin singlets.",
author = "Masayoshi Fujihala and Zheng, {Xu Guang} and Hiroki Morodomi and Tatsuya Kawae and Akira Matsuo and Koichi Kindo and Isao Watanabe",
year = "2014",
month = "3",
day = "6",
doi = "10.1103/PhysRevB.89.100401",
language = "English",
volume = "89",
journal = "Physical Review B - Condensed Matter and Materials Physics",
issn = "1098-0121",
publisher = "American Physical Society",
number = "10",

}

TY - JOUR

T1 - Unconventional spin freezing in the highly two-dimensional spin- 1 2 kagome antiferromagnet Cd 2 Cu 3 (OH) 6 (SO 4) 2 4H 2 O

T2 - Evidence of partial order and coexisting spin singlet state on a distorted kagome lattice

AU - Fujihala, Masayoshi

AU - Zheng, Xu Guang

AU - Morodomi, Hiroki

AU - Kawae, Tatsuya

AU - Matsuo, Akira

AU - Kindo, Koichi

AU - Watanabe, Isao

PY - 2014/3/6

Y1 - 2014/3/6

N2 - S = 1/2 quantum-spin systems of the kagome lattice have received intense recent attention because they are expected to be promising candidates for novel quantum states such as spin liquid, spin nematic, and other unknown exotic states. Here we report an unusual transition in a highly two-dimensional and slightly distorted S = 1/2 quantum kagome system Cd2Cu3(OH)6(SO4)24H2O, which is a purified compound of the recently identified mineral edwardsite, Cd1.89Zn0.11Cu3(OH)6(SO4)24H2O. The S = 1/2 spins of Cu2+ ions form a highly two-dimensional kagome lattice with an extraordinarily large interlayer spacing >10 Å, thus providing a unique kagome lattice with minimum interlayer perturbation. The magnetization shows a Curie-Weiss temperature of 40.5 K and moment freezing below around TF = 5 K and a magnetic transition feature near 3 K. The muon spin relaxation shows static magnetism below 5 K and saturation below 3 K. However, distinct features have been observed distinguishing it from a spin glass or a conventional order: High-field magnetization until 50 T showed a saturated value of only 1/3 of the full expected moment. Analysis of specific heat suggests that only 1/3 of the spins are related to the magnetic order; on the other hand, the order is destroyed in external field and 1/3 of the spins respond to the field with a Schottky-like behavior while the other 2/3 of the spins remain inactive. These experimental results suggest an unconventional coexistence of the partial order and most probably spin singlets.

AB - S = 1/2 quantum-spin systems of the kagome lattice have received intense recent attention because they are expected to be promising candidates for novel quantum states such as spin liquid, spin nematic, and other unknown exotic states. Here we report an unusual transition in a highly two-dimensional and slightly distorted S = 1/2 quantum kagome system Cd2Cu3(OH)6(SO4)24H2O, which is a purified compound of the recently identified mineral edwardsite, Cd1.89Zn0.11Cu3(OH)6(SO4)24H2O. The S = 1/2 spins of Cu2+ ions form a highly two-dimensional kagome lattice with an extraordinarily large interlayer spacing >10 Å, thus providing a unique kagome lattice with minimum interlayer perturbation. The magnetization shows a Curie-Weiss temperature of 40.5 K and moment freezing below around TF = 5 K and a magnetic transition feature near 3 K. The muon spin relaxation shows static magnetism below 5 K and saturation below 3 K. However, distinct features have been observed distinguishing it from a spin glass or a conventional order: High-field magnetization until 50 T showed a saturated value of only 1/3 of the full expected moment. Analysis of specific heat suggests that only 1/3 of the spins are related to the magnetic order; on the other hand, the order is destroyed in external field and 1/3 of the spins respond to the field with a Schottky-like behavior while the other 2/3 of the spins remain inactive. These experimental results suggest an unconventional coexistence of the partial order and most probably spin singlets.

UR - http://www.scopus.com/inward/record.url?scp=84897844149&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=84897844149&partnerID=8YFLogxK

U2 - 10.1103/PhysRevB.89.100401

DO - 10.1103/PhysRevB.89.100401

M3 - Article

AN - SCOPUS:84897844149

VL - 89

JO - Physical Review B - Condensed Matter and Materials Physics

JF - Physical Review B - Condensed Matter and Materials Physics

SN - 1098-0121

IS - 10

M1 - 100401

ER -