Magnetic phase transition inLa0.7Sr0.3

S. E. Lofland

¹

,

Vishva Ray

²

,

P. H. Kim

³

et al.

Critical Behavior Near the Paramagnetic to Ferromagnetic Phase Transition Temperature in Sr1.5Nd0.5MnO4 Compound

“…For example, Morrish et al [13] had found a high value of β = 0.495 in a La 0.65 Pb 0.44 MnO 3 crystal. This is in good agreement with later results from Lofland et al [14] which yield β = 0.45 in La07Sr03MnO3, indicating a mean-field-like behavior at the magnetic phase transition. In contrast to this, neutron scattering experiments on La 0.7 Sr 0.3 MnO 3 give a rather low β value, 0.295 [15].…”

“…Many of the experimental studies of critical phenomena have been previously made on ferromagnetic manganites [12][13][14][15][16], with some controversial results concerning the critical exponents and even the order of the magnetic transitions. For example, Morrish et al [13] had found a high value of β = 0.495 in a La 0.65 Pb 0.44 MnO 3 crystal.…”

Magnetoelectric coupling at the EuO/BaTiO3 interface

“…Crystal quality, different chemical compositions of the manganite, and even the temperature range selected for fitting 34 (as also seems to be the case for the EuO/BTO system) can have noticeable effects on b. [34][35][36][37][38] For the LSMO/BTO system, our results show consistency with prior values obtained for the LSMO system, specifically with those that fit the mean field theory predictions.…”

Static critical behavior of the ferromagnetic transition in LaMnO3.14 manganite

“…Modified Arrott plot and Kouvel Fisher analysis yield estimates for the critical exponents β, and γ, with values between that predicted for the Heisenberg model and mean field theory. At low fields we found an anomalous small value of β, indicating that the critical behavior is influenced by the range of magnetic fields used.The discovery of the colossal magnetoresistance (CMR) in hole-doped LaMnO 3 perovskites has attracted renewed interest in this class of materials, and numerous papers appeared in which the paramagnetic-ferromagnetic phase transition was investigated [1][2][3][4][5]. In the study of the critical behavior associated with this transition there is considerable disagreement among the experimental estimates for the exponent β, associated with the temperature dependence of spontaneous magnetization.…”