Heat Capacity Magnetic and Lattice Dynamic Properties of Pseudo-two Dimensional: M2Fe2O(AsO4)2 [M=K, K0.79Cs0.21 and Rb] Compounds

Pramod Kumar; Rashmi Singh; L. D. Sanjeewa; Rachana Kumar

doi:10.5185/amlett.2016.6450

Heat Capacity Magnetic and Lattice Dynamic Properties of Pseudo-two Dimensional: M₂Fe₂O(AsO₄)₂ [M=K, K_0.79Cs_0.21 and Rb] Compounds

Pramod Kumar
, Rashmi Singh
, L. D. Sanjeewa
, Rachana Kumar

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

Abstract

In this paper, structural, magnetic and heat capacity of M₂Fe₂O(AsO₄)₂ compounds have been reported. Most interestingly, the magnetization at very low fields a complete negative magnetization was observed in both field cooling and zero field cooling in K₂Fe₂O(AsO₄)₂ and Rb₂Fe₂O(AsO₄)₂ compounds whereas field cooled is positive in KCsFe₂O(AsO₄)₂. A possible mechanism for the observed peculiar magnetic behavior is discussed, related to the competition of the single-ion magnetic anisotropy and the antisymmetric magnetization behavior in two crystallographically different FeO₆ centers. We estimated the gap (Δ) opening at low temperature K₂Fe₂O (AsO₄)₂ KCs₂Fe₂O (AsO₄)₂ and Rb₂Fe₂O (AsO₄)₂, are 23.6 K, 23.9 K and 25 K respectively from heat capacity. Magnetic part of heat capacity at low temperatures follows the T³ dependence, indicates that the low temperature magnetic state in all these compounds are antiferromagnetic.

Original language	English
Pages (from-to)	964-970
Number of pages	7
Journal	Advanced Materials Letters
Volume	7
Issue number	12
DOIs	https://doi.org/10.5185/amlett.2016.6450
State	Published - 2016
Externally published	Yes

Bibliographical note

Publisher Copyright:
© 2016 VBRI Press.

Keywords

Antiferromagnetic
Heat capacity
Magnetic frustrations
Magnetization

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10.5185/amlett.2016.6450

Cite this

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title = "Heat Capacity Magnetic and Lattice Dynamic Properties of Pseudo-two Dimensional: M2Fe2O(AsO4)2 [M=K, K0.79Cs0.21 and Rb] Compounds",

abstract = "In this paper, structural, magnetic and heat capacity of M2Fe2O(AsO4)2 compounds have been reported. Most interestingly, the magnetization at very low fields a complete negative magnetization was observed in both field cooling and zero field cooling in K2Fe2O(AsO4)2 and Rb2Fe2O(AsO4)2 compounds whereas field cooled is positive in KCsFe2O(AsO4)2. A possible mechanism for the observed peculiar magnetic behavior is discussed, related to the competition of the single-ion magnetic anisotropy and the antisymmetric magnetization behavior in two crystallographically different FeO6 centers. We estimated the gap (Δ) opening at low temperature K2Fe2O (AsO4)2 KCs2Fe2O (AsO4)2 and Rb2Fe2O (AsO4)2, are 23.6 K, 23.9 K and 25 K respectively from heat capacity. Magnetic part of heat capacity at low temperatures follows the T3 dependence, indicates that the low temperature magnetic state in all these compounds are antiferromagnetic.",

keywords = "Antiferromagnetic, Heat capacity, Magnetic frustrations, Magnetization",

author = "Pramod Kumar and Rashmi Singh and Sanjeewa, \{L. D.\} and Rachana Kumar",

note = "Publisher Copyright: {\textcopyright} 2016 VBRI Press.",

year = "2016",

doi = "10.5185/amlett.2016.6450",

language = "אנגלית",

volume = "7",

pages = "964--970",

journal = "Advanced Materials Letters",

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T1 - Heat Capacity Magnetic and Lattice Dynamic Properties of Pseudo-two Dimensional

T2 - M2Fe2O(AsO4)2 [M=K, K0.79Cs0.21 and Rb] Compounds

AU - Kumar, Pramod

AU - Singh, Rashmi

AU - Sanjeewa, L. D.

AU - Kumar, Rachana

PY - 2016

Y1 - 2016

N2 - In this paper, structural, magnetic and heat capacity of M2Fe2O(AsO4)2 compounds have been reported. Most interestingly, the magnetization at very low fields a complete negative magnetization was observed in both field cooling and zero field cooling in K2Fe2O(AsO4)2 and Rb2Fe2O(AsO4)2 compounds whereas field cooled is positive in KCsFe2O(AsO4)2. A possible mechanism for the observed peculiar magnetic behavior is discussed, related to the competition of the single-ion magnetic anisotropy and the antisymmetric magnetization behavior in two crystallographically different FeO6 centers. We estimated the gap (Δ) opening at low temperature K2Fe2O (AsO4)2 KCs2Fe2O (AsO4)2 and Rb2Fe2O (AsO4)2, are 23.6 K, 23.9 K and 25 K respectively from heat capacity. Magnetic part of heat capacity at low temperatures follows the T3 dependence, indicates that the low temperature magnetic state in all these compounds are antiferromagnetic.

AB - In this paper, structural, magnetic and heat capacity of M2Fe2O(AsO4)2 compounds have been reported. Most interestingly, the magnetization at very low fields a complete negative magnetization was observed in both field cooling and zero field cooling in K2Fe2O(AsO4)2 and Rb2Fe2O(AsO4)2 compounds whereas field cooled is positive in KCsFe2O(AsO4)2. A possible mechanism for the observed peculiar magnetic behavior is discussed, related to the competition of the single-ion magnetic anisotropy and the antisymmetric magnetization behavior in two crystallographically different FeO6 centers. We estimated the gap (Δ) opening at low temperature K2Fe2O (AsO4)2 KCs2Fe2O (AsO4)2 and Rb2Fe2O (AsO4)2, are 23.6 K, 23.9 K and 25 K respectively from heat capacity. Magnetic part of heat capacity at low temperatures follows the T3 dependence, indicates that the low temperature magnetic state in all these compounds are antiferromagnetic.

KW - Antiferromagnetic

KW - Heat capacity

KW - Magnetic frustrations

KW - Magnetization

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