Structural, magnetic, and electrical properties of single-crystallineLa1−xSrx

Abstract

We report on structural, magnetic and electrical properties of Sr-doped LaMnO3 single crystals for doping levels 0.4 ≤ x ≤ 0.85. The complex structural and magnetic phase diagram can only be explained assuming significant contributions from the orbital degrees of freedom. Close to x = 0.6 a ferromagnetic metal is followed by an antiferromagnetic metallic phase below 200 K. This antiferromagnetic metallic phase exists in a monoclinic crystallographic structure. Following theoretical predictions this metallic antiferromagnet is expected to reveal an (x 2 -y 2 )-type orbital order. For higher Sr concentrations an antiferromagnetic insulator is established below room temperature.

Cooling-field dependence of exchange bias effect in La0.45Sr0.55MnO3 nanoparticles

“…This is also a superparamagnetic characteristic. 20 Unlike single crystal and bulk samples of LSMO, [24][25][26] Figure 1(c) shows the magnetization of the sample at different temperatures. It should be noted that it is far from saturated even in 5 T and varies almost linearly with magnetic field for l 0 H > 1 T, suggesting that the ferromagnetism is due to spin canting in an underlying antiferromagnetic structure.…”

“…0.5, the DE interaction mediates ferromagnetic coupling between Mn 3þ and Mn 4þ ions within the ab plane and the SE interaction produces out of plane antiferromagnetic coupling along the c axis, resulting in the A-type antiferromagnetic ground state. 24,25 A canted ferromagnetic structure with a net moment 1 l B /Mn has slightly higher energy, but it can be stabilized by entropy if the canting is random. However, the antiferromagnetic state becomes increasingly unstable in small particles compared to the canted state.…”

“…1(d) where it is seen to increase on decreasing temperature reaching the value of 1.0 l B /Mn at 5 K, just 29% of the 3.45 l B /Mn, expected for a collinear ferromagnetic structure, but much higher than the values reported for bulk and single crystal of LSMO. [24][25][26] If the ferromagnetism was completely concentrated in the core of the particle, the core would have a diameter of 10.4 nm, but if there was a collinear ferromagnetic outer shell, it would have a thickness of 0.9 nm.…”

Strain-induced magnetization control in an oxide multiferroic heterostructure

“…It has been previously shown that the total 42 magnetic moment [16,17], the coercive field [18], the magnetic 43 anisotropy [19,20], and the Curie temperature [17,21] [25]. The magnetic state of 72 LSMO is reflected in its transport properties.…”

Thickness dependence of La0.7Sr0.3MnO3/PbZr0.2Ti0.8O3 magnetoelectric interfaces

“…Strong ME coupling alternatively can occur at the interface of certain materials, [13][14][15] one of which is the interface between La 0.7 Sr 0.3 MnO 3 (LSMO) and PbZr 0.2 Ti 0.8 O 3 (PZT). La 1Àx Sr x MnO 3 exhibits a rich phase diagram 16,17 at varying doping level x. PZT is a strong room temperature ferroelectric (FE) material. In recent work on ME interfaces, a large magnetization modulation was found by Lu et al 18 19 In addition to these observations, Mn valence is also known to associate with the LSMO magnetization.…”