CobaltMaghrebV1, Main, Exploration, bibRecord, 000786

Magnetic structure and analysis of the exchange interactions in BiMO(PO4) (M = Co, Ni)

Identifieur interne : 000786 ( Main/Exploration ); précédent : 000785; suivant : 000787

Magnetic structure and analysis of the exchange interactions in BiMO(PO4) (M = Co, Ni)

Auteurs : O. Mentrel [France] ; F. Bouree [France] ; J. Rodriguez-Carvajal [France] ; A. El Jazouli [Maroc] ; N. El Khayati [Maroc] ; El M. Ketatni [Maroc]

Source :

Journal of physics. Condensed matter : (Print) [ 0953-8984 ] ; 2008.

RBID : Pascal:08-0499458

Descripteurs français

Pascal (Inist)
- Structure magnétique, Interaction échange, Diffraction neutron, Théorie groupe, Structure cristalline, Transition paramagnétique antiferromagnétique, Double échange, Diagramme phase magnétique, Interaction superéchange, Longueur liaison, Anisotropie magnétique, Réseau monoclinique, Matériau ferromagnétique, Bismuth cobalt oxyphosphate, Bismuth nickel oxyphosphate, BiCoO(PO4), BiNiO(PO4), Oxyphosphate.

English descriptors

KwdEn :
- Bond lengths, Crystal structure, Double exchange, Exchange interactions, Ferromagnetic materials, Group theory, Magnetic anisotropy, Magnetic structure, Magnetic-phase diagrams, Monoclinic lattices, Neutron diffraction, Oxyphosphate, Paramagnetic-antiferromagnetic transitions, Superexchange interactions.

Abstract

The magnetic structures of the two bismuth oxy-phosphate compounds BiMPO₅ (M²⁺ = Ni²⁺, Co²⁺) have been determined by neutron powder diffraction using group theory analysis as a preliminary tool. Both compounds adopt a monoclinic crystal structure (S.G. P2₁/n, a = 7.1642(2) Å, b = 11.2038(3) A, c = 5.1740(2) Å and β = 107.296(2)° for Ni²⁺ and a = 7.2441(1) Å, b = 11.2828(1) Å, c = 5.2258(1) Å and β = 107.841(1)° for Co²⁺). The refinement of the magnetic structures below T_N = 17.5 and 15 K, respectively, for both compounds show that the magnetic structure is characterized by the propagation vector k = (-1/2, 0, 1/2), with components given with respect to the reciprocal lattice of the nuclear structure. This means a magnetic unit cell that is a multiple of the nuclear cell. The magnetic structure is constituted of ferromagnetic pairs of metal ions antiferromagnetically coupled within double chains. The relative strength of the intra and inter double chains exchange interactions has been examined by establishing a theoretical magnetic phase diagram. Most of the interactions come from M-O-O-M super-super-exchange paths. At its ground state, BiNiPO₅ shows a nearly collinear arrangement of magnetic moments with m _1.5 K = 2.13(3) μ_B/Ni. Due to the strong magnetic anisotropy of Co²⁺ (m_1.5 K = 3.52(3) μ_B/Co), the collinear character is largely lost while the magnetic structure remains analysable on the basis of the greatest isotropic component of the local moments.

Affiliations:

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Le document en format XML

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<series><title level="j" type="main">Journal of physics. Condensed matter : (Print)</title>
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<profileDesc><textClass><keywords scheme="KwdEn" xml:lang="en"><term>Bond lengths</term>
<term>Crystal structure</term>
<term>Double exchange</term>
<term>Exchange interactions</term>
<term>Ferromagnetic materials</term>
<term>Group theory</term>
<term>Magnetic anisotropy</term>
<term>Magnetic structure</term>
<term>Magnetic-phase diagrams</term>
<term>Monoclinic lattices</term>
<term>Neutron diffraction</term>
<term>Oxyphosphate</term>
<term>Paramagnetic-antiferromagnetic transitions</term>
<term>Superexchange interactions</term>
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<keywords scheme="Pascal" xml:lang="fr"><term>Structure magnétique</term>
<term>Interaction échange</term>
<term>Diffraction neutron</term>
<term>Théorie groupe</term>
<term>Structure cristalline</term>
<term>Transition paramagnétique antiferromagnétique</term>
<term>Double échange</term>
<term>Diagramme phase magnétique</term>
<term>Interaction superéchange</term>
<term>Longueur liaison</term>
<term>Anisotropie magnétique</term>
<term>Réseau monoclinique</term>
<term>Matériau ferromagnétique</term>
<term>Bismuth cobalt oxyphosphate</term>
<term>Bismuth nickel oxyphosphate</term>
<term>BiCoO(PO4)</term>
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<front><div type="abstract" xml:lang="en">The magnetic structures of the two bismuth oxy-phosphate compounds BiMPO<sub>5</sub>
 (M<sup>2+</sup>
 = Ni<sup>2+</sup>
, Co<sup>2+</sup>
) have been determined by neutron powder diffraction using group theory analysis as a preliminary tool. Both compounds adopt a monoclinic crystal structure (S.G. P2<sub>1</sub>
/n, a = 7.1642(2) Å, b = 11.2038(3) A, c = 5.1740(2) Å and β = 107.296(2)° for Ni<sup>2+</sup>
 and a = 7.2441(1) Å, b = 11.2828(1) Å, c = 5.2258(1) Å and β = 107.841(1)° for Co<sup>2+</sup>
). The refinement of the magnetic structures below T<sub>N</sub>
 = 17.5 and 15 K, respectively, for both compounds show that the magnetic structure is characterized by the propagation vector k = (-1/2, 0, 1/2), with components given with respect to the reciprocal lattice of the nuclear structure. This means a magnetic unit cell that is a multiple of the nuclear cell. The magnetic structure is constituted of ferromagnetic pairs of metal ions antiferromagnetically coupled within double chains. The relative strength of the intra and inter double chains exchange interactions has been examined by establishing a theoretical magnetic phase diagram. Most of the interactions come from M-O-O-M super-super-exchange paths. At its ground state, BiNiPO<sub>5</sub>
 shows a nearly collinear arrangement of magnetic moments with m <sub>1.5</sub>
 K = 2.13(3) μ<sub>B</sub>
/Ni. Due to the strong magnetic anisotropy of Co<sup>2+</sup>
 (m<sub>1.5</sub>
 K = 3.52(3) μ<sub>B</sub>
/Co), the collinear character is largely lost while the magnetic structure remains analysable on the basis of the greatest isotropic component of the local moments.</div>
</front>
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<name sortKey="El Khayati, N" sort="El Khayati, N" uniqKey="El Khayati N" first="N." last="El Khayati">N. El Khayati</name>
<name sortKey="Ketatni, El M" sort="Ketatni, El M" uniqKey="Ketatni E" first="El M." last="Ketatni">El M. Ketatni</name>
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</record>

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Magnetic structure and analysis of the exchange interactions in BiMO(PO4) (M = Co, Ni)

Magnetic structure and analysis of the exchange interactions in BiMO(PO4) (M = Co, Ni)

Source :

Descripteurs français

English descriptors

Abstract

Links toward previous steps (curation, corpus...)

Le document en format XML

Pour manipuler ce document sous Unix (Dilib)

Pour mettre un lien sur cette page dans le réseau Wicri