Magnetic Properties of A 2 Ni 2 TeO 6 (A = K, Li): Zigzag Order in the Honeycomb Layers of Ni 2+ Ions Induced by First and Third Nearest-Neighbor Spin Exchanges
The static and dynamic magnetic properties and the specific heat of K Ni TeO and Li Ni TeO were examined and it was found that they undergo a long-range ordering at = 22.8 and 24.4 K, respectively, but exhibit a strong short-range order. At high temperature, the magnetic susceptibilities of K Ni TeO...
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Published in | Materials Vol. 15; no. 7 |
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Main Authors | , , , , , , |
Format | Journal Article |
Language | English |
Published |
Switzerland
31.03.2022
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Subjects | |
Online Access | Get full text |
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Summary: | The static and dynamic magnetic properties and the specific heat of K
Ni
TeO
and Li
Ni
TeO
were examined and it was found that they undergo a long-range ordering at
= 22.8 and 24.4 K, respectively, but exhibit a strong short-range order. At high temperature, the magnetic susceptibilities of K
Ni
TeO
and Li
Ni
TeO
are described by a Curie-Weiss law, with Curie-Weiss temperatures Θ of approximately -13 and -20 K, respectively, leading to the effective magnetic moment of about 4.46 ± 0.01
per formula unit, as expected for Ni
(
= 1) ions. In the paramagnetic region, the ESR spectra of K
Ni
TeO
and Li
Ni
TeO
show a single Lorentzian-shaped line characterized by the isotropic effective
-factor,
= 2.19 ± 0.01. The energy-mapping analysis shows that the honeycomb layers of A
Ni
TeO
(A = K, Li) and Li
Ni
SbO
adopt a zigzag order, in which zigzag ferromagnetic chains are antiferromagnetically coupled, because the third nearest-neighbor spin exchanges are strongly antiferromagnetic while the first nearest-neighbor spin exchanges are strongly ferromagnetic, and that adjacent zigzag-ordered honeycomb layers prefer to be ferromagnetically coupled. The short-range order of the zigzag-ordered honeycomb lattices of K
Ni
TeO
and Li
Ni
TeO
is equivalent to that of an antiferromagnetic uniform chain, and is related to the short-range order of the ferromagnetic chains along the direction perpendicular to the chains. |
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ISSN: | 1996-1944 1996-1944 |