Author:
Tiwari Jeetendra Kumar,Kumar Birendra,Chauhan Harish Chandr,Ghosh Subhasis
Abstract
AbstractThe tri-layer La$$_{3-3x}$$
3
-
3
x
Sr$$_{1+3x}$$
1
+
3
x
Mn$$_{3}$$
3
O$$_{10}$$
10
manganites of Ruddlesden–Popper (RP) series are naturally arranged layered structure with alternate stacking of ω-MnO$$_2$$
2
(ω = 3) planes and rock-salt type block layers (La, Sr)$$_2$$
2
O$$_2$$
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$$ _{C} $$
C
). However, the tri-layer La$$_{2.1}$$
2.1
Sr$$_{1.9}$$
1.9
Mn$$_{3}$$
3
O$$_{10}$$
10
shows non-zero magnetic moment above T$$ _{C} $$
C
and also another transition at higher temperature T$$ ^{*} \approx $$
∗
≈
263 K. The non-zero magnetization above T$$ _{C} $$
C
emphasizes that the phase transition in tri-layer La$$_{2.1}$$
2.1
Sr$$_{1.9}$$
1.9
Mn$$_{3}$$
3
O$$_{10}$$
10
not a ferromagnetic to paramagnetic state. We show here the non-zero magnetic moment above T$$ _{C} $$
C
is due to the quasi-two-dimensional nature of the tri-layer La$$_{2.1}$$
2.1
Sr$$_{1.9}$$
1.9
Mn$$_{3}$$
3
O$$_{10}$$
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$$_C$$
C
to understand the low dimensional magnetism in tri-layer La$$_{2.1}$$
2.1
Sr$$_{1.9}$$
1.9
Mn$$_{3}$$
3
O$$_{10}$$
10
. We have obtained the critical exponents for tri-layer La$$_{2.1}$$
2.1
Sr$$_{1.9}$$
1.9
Mn$$_{3}$$
3
O$$_{10}$$
10
, which belong to the short-range two-dimensional (2D)-Ising universality class. The low dimensional magnetism in tri-layer La$$_{2.1}$$
2.1
Sr$$_{1.9}$$
1.9
Mn$$_{3}$$
3
O$$_{10}$$
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$$_{2.1}$$
2.1
Sr$$_{1.9}$$
1.9
Mn$$_{3}$$
3
O$$_{10}$$
10
results in three different types of interactions intra-planer ($$ J_{ab} $$
J
ab
), intra-tri-layer ($$ J_{c} $$
J
c
) and inter-tri-layer ($$ J' $$
J
′
) such that $$ J_{ab}> J_{c}>> J' $$
J
ab
>
J
c
>
>
J
′
and competition among these give rise to the canted antiferromagnetic spin structure above T$$ _{C} $$
C
. Based on the similar magnetic interaction in bi-layer manganite, we propose that the tri-layer La$$_{2.1}$$
2.1
Sr$$_{1.9}$$
1.9
Mn$$_{3}$$
3
O$$_{10}$$
10
should be able to host the skyrmion below T$$ _{C} $$
C
due to its strong anisotropy and layered structure.
Publisher
Springer Science and Business Media LLC
Reference74 articles.
1. Fawcett, I. D., Sunstrom, J. E. IV., Greenblatt, M., Croft, M. & Ramanujachary, K. Structure, magnetism, and properties of Ruddlesden–Popper calcium manganates prepared from citrate gels. Chem. Mater. 10, 3643–3651 (1998).
2. Dagotto, E. Nanoscale phase separation and colossal magnetoresistance: the physics of manganites and related compounds, vol. 136 (Springer, 2013).
3. O’Reilly, T. J. & Offenbacher, E. L. Molecular orbital calculation for trigonally distorted octahedral complexes. J. Chem. Phys. 54, 3065–3076 (1971).
4. Van Vleck, J. Theory of the variations in paramagnetic anisotropy among different salts of the iron group. Phys. Rev. 41, 208 (1932).
5. Jahn, H. A. & Teller, E. Stability of polyatomic molecules in degenerate electronic states-i-orbital degeneracy. Proc. R. Soc. Lond. 161, 220–235 (1937).
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