Disorder effects in the S=1 antiferromagnetic spin ladder CaV2O4

S. R. Guitarra; A. Caneiro; D. Niebieskikwiat

doi:10.1016/j.jmmm.2015.05.012

Disorder effects in the S=1 antiferromagnetic spin ladder CaV₂O₄

S. R. Guitarra
, A. Caneiro
, D. Niebieskikwiat^*

^*Corresponding author for this work

Instituto Bolseiro

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

4 Scopus citations

Abstract

We study the physical properties of the antiferromagnetic spin ladder CaV₂O₄ (CVO) and the Y-doped related compound Ca_0.9Y_0.1V₂O₄. In the latter, X-ray diffraction demonstrates the segregation of a small amount of a vanadium-perovskite impurity phase, leading to the formation of V vacancies within the main CVO-type structure. The 1D character of this calcium-vanadite enhances the influence of the vacancies on the electric and magnetic properties of Ca_0.9Y_0.1V₂O₄. Electrical transport is characterized by a variable-range hopping mechanism determined by the charging energy of nm-sized segments of V chains delimited by V vacancies, i.e. a Coulomb gap is formed at the Fermi level. These vacancies also locally affect the magnetic correlations, breaking the long-range AFM order observed in CaV₂O₄ and producing exchange bias when the Y-doped sample is cooled with an applied magnetic field.

Original language	English
Pages (from-to)	63-67
Number of pages	5
Journal	Journal of Magnetism and Magnetic Materials
Volume	392
DOIs	https://doi.org/10.1016/j.jmmm.2015.05.012
State	Published - 16 May 2015

Keywords

CaVO
Defect-induced magnetic moments
Disordered solids
Exchange bias
Spin ladders
Variable-range hopping

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10.1016/j.jmmm.2015.05.012

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title = "Disorder effects in the S=1 antiferromagnetic spin ladder CaV2O4",

abstract = "We study the physical properties of the antiferromagnetic spin ladder CaV2O4 (CVO) and the Y-doped related compound Ca0.9Y0.1V2O4. In the latter, X-ray diffraction demonstrates the segregation of a small amount of a vanadium-perovskite impurity phase, leading to the formation of V vacancies within the main CVO-type structure. The 1D character of this calcium-vanadite enhances the influence of the vacancies on the electric and magnetic properties of Ca0.9Y0.1V2O4. Electrical transport is characterized by a variable-range hopping mechanism determined by the charging energy of nm-sized segments of V chains delimited by V vacancies, i.e. a Coulomb gap is formed at the Fermi level. These vacancies also locally affect the magnetic correlations, breaking the long-range AFM order observed in CaV2O4 and producing exchange bias when the Y-doped sample is cooled with an applied magnetic field.",

keywords = "CaVO, Defect-induced magnetic moments, Disordered solids, Exchange bias, Spin ladders, Variable-range hopping",

author = "Guitarra, \{S. R.\} and A. Caneiro and D. Niebieskikwiat",

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doi = "10.1016/j.jmmm.2015.05.012",

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T1 - Disorder effects in the S=1 antiferromagnetic spin ladder CaV2O4

AU - Guitarra, S. R.

AU - Caneiro, A.

AU - Niebieskikwiat, D.

PY - 2015/5/16

Y1 - 2015/5/16

N2 - We study the physical properties of the antiferromagnetic spin ladder CaV2O4 (CVO) and the Y-doped related compound Ca0.9Y0.1V2O4. In the latter, X-ray diffraction demonstrates the segregation of a small amount of a vanadium-perovskite impurity phase, leading to the formation of V vacancies within the main CVO-type structure. The 1D character of this calcium-vanadite enhances the influence of the vacancies on the electric and magnetic properties of Ca0.9Y0.1V2O4. Electrical transport is characterized by a variable-range hopping mechanism determined by the charging energy of nm-sized segments of V chains delimited by V vacancies, i.e. a Coulomb gap is formed at the Fermi level. These vacancies also locally affect the magnetic correlations, breaking the long-range AFM order observed in CaV2O4 and producing exchange bias when the Y-doped sample is cooled with an applied magnetic field.

AB - We study the physical properties of the antiferromagnetic spin ladder CaV2O4 (CVO) and the Y-doped related compound Ca0.9Y0.1V2O4. In the latter, X-ray diffraction demonstrates the segregation of a small amount of a vanadium-perovskite impurity phase, leading to the formation of V vacancies within the main CVO-type structure. The 1D character of this calcium-vanadite enhances the influence of the vacancies on the electric and magnetic properties of Ca0.9Y0.1V2O4. Electrical transport is characterized by a variable-range hopping mechanism determined by the charging energy of nm-sized segments of V chains delimited by V vacancies, i.e. a Coulomb gap is formed at the Fermi level. These vacancies also locally affect the magnetic correlations, breaking the long-range AFM order observed in CaV2O4 and producing exchange bias when the Y-doped sample is cooled with an applied magnetic field.

KW - CaVO

KW - Defect-induced magnetic moments

KW - Disordered solids

KW - Exchange bias

KW - Spin ladders

KW - Variable-range hopping

UR - https://www.scopus.com/pages/publications/84929316621

U2 - 10.1016/j.jmmm.2015.05.012

DO - 10.1016/j.jmmm.2015.05.012

M3 - Artículo

AN - SCOPUS:84929316621

SN - 0304-8853

VL - 392

SP - 63

EP - 67

JO - Journal of Magnetism and Magnetic Materials

JF - Journal of Magnetism and Magnetic Materials

ER -

Disorder effects in the S=1 antiferromagnetic spin ladder CaV₂O₄

Abstract

Keywords

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