Magnetism in quasi-two-dimensional tri-layer La2.1Sr1.9Mn3O10 manganite
The tri-layer La 3 - 3 x Sr 1 + 3 x Mn 3 O 10 manganites of Ruddlesden–Popper (RP) series are naturally arranged layered structure with alternate stacking of ω-MnO 2 (ω = 3) planes and rock-salt type block layers (La, Sr) 2 O 2 along c-axis. The dimensionality of the RP series manganites depends on...
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Veröffentlicht in: | Scientific reports 2021-07, Vol.11 (1), p.14117-14117, Article 14117 |
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Sprache: | eng |
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Zusammenfassung: | The tri-layer La
3
-
3
x
Sr
1
+
3
x
Mn
3
O
10
manganites of Ruddlesden–Popper (RP) series are naturally arranged layered structure with alternate stacking of ω-MnO
2
(ω = 3) planes and rock-salt type block layers (La, Sr)
2
O
2
along c-axis. The dimensionality of the RP series manganites depends on the number of perovskite layers and significantly affects the magnetic and transport properties of the system. Generally, when a ferromagnetic material undergoes a magnetic phase transition from ferromagnetic to paramagnetic state, the magnetic moment of the system becomes zero above the transition temperature (T
C
). However, the tri-layer La
2.1
Sr
1.9
Mn
3
O
10
shows non-zero magnetic moment above T
C
and also another transition at higher temperature T
∗
≈
263 K. The non-zero magnetization above T
C
emphasizes that the phase transition in tri-layer La
2.1
Sr
1.9
Mn
3
O
10
not a ferromagnetic to paramagnetic state. We show here the non-zero magnetic moment above T
C
is due to the quasi-two-dimensional nature of the tri-layer La
2.1
Sr
1.9
Mn
3
O
10
manganite. The scaling of the magnetic entropy change confirms the second-order phase transition and the critical behavior of phase transition has been studied around T
C
to understand the low dimensional magnetism in tri-layer La
2.1
Sr
1.9
Mn
3
O
10
. We have obtained the critical exponents for tri-layer La
2.1
Sr
1.9
Mn
3
O
10
, which belong to the short-range two-dimensional (2D)-Ising universality class. The low dimensional magnetism in tri-layer La
2.1
Sr
1.9
Mn
3
O
10
manganite is also explained with the help of renormalization group theoretical approach for short-range 2D-Ising systems. It has been shown that the layered structure of tri-layer La
2.1
Sr
1.9
Mn
3
O
10
results in three different types of interactions intra-planer (
J
ab
), intra-tri-layer (
J
c
) and inter-tri-layer (
J
′
) such that
J
ab
>
J
c
>
>
J
′
and competition among these give rise to the canted antiferromagnetic spin structure above T
C
. Based on the similar magnetic interaction in bi-layer manganite, we propose that the tri-layer La
2.1
Sr
1.9
Mn
3
O
10
should be able to host the skyrmion below T
C
due to its strong anisotropy and layered structure. |
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ISSN: | 2045-2322 2045-2322 |
DOI: | 10.1038/s41598-021-93290-w |