Heat diffusivity of Nd1−xSrxMnO3−δ compounds

Evidence for an electrical field induced order–order transition in Nd0.7Sr0.3MnO

“…Possibly T * is the remnant of a Neel point in the sense that a topologically compensated spin array goes over to thermal spin disorder. A similar behaviour was observed for a compound which was characterised as Nd 0.67 Sr 0.33 MnO 2.90 [4]: a small peak in the specific heat capacity c p (T) was observed at 240 K while there was no spontaneous magnetisation M observed for 250 K < T < 150 K.…”

“…T c : ferromagnetic Curie temperature (inflection point); θ f : paramagnetic Curie temperature; T * : Néel-like point according to[4] and this work; T CA = T B : spin compensated i-canted i transition.…”

Electrical-field-induced order transitions in Sr-doped manganite perovskites

“…A similar behavior and antiferromagnetic structure (AFM) was observed for a compound characterized as Nd 0.67 Sr 0.33 MnO 2.90 , in which a small peak in the specific heat capacity c p (T) was observed at 240 K where there was no spontaneous magnetization M, while a steep rise in M (at 0.01 T) appeared only at 150 K. [6] Moreover, χ −1 (T) for the case that AFM order is followed by a canted state is present in Ref. [7], and the result is very similar to what found here.…”

“…T C : ferromagnetic Curie temperature (inflection point); Θ f : paramagnetic Curie temperature; T*: Néel-like point according to[6] and this work; T B : spin compensated insulator to canted insulator transition. (b) Modified de Gennes T-x magnetic-electronic phase diagram according to[9].…”

Heat diffusivity of Nd1−xSrxMnO3−δ and La1−xCaxMnO3−δ compounds

“…1,2 In order to measure we have chosen the transient thermoelectric effect ͑TTE͒, which primarily measures the heat diffusivity D, however, once D is known, the thermal conductivity can be calculated using specific heat capacity data, as c p Ϸc v , D ϭ/c v 0 ͑ 0 : density͒. We try to characterize each sample by its ␦ value and measurements of several physical quantities, taken on the same sample.…”