Unusual magnetic and transport properties above the Curie temperature in La2/3Ca1/3MnO3

Magnetic inhomogeneities in crystalline bulk and nanometer sized La0.7Ca0.3MnO3: ESR probing

“…This higher structural/chemical homogeneity leads to improved magnetic homogeneity, which results in (i) reduction of T-interval of the FM and PM phases' coexistence and in (ii) sharper minimum of ∆H pp vs. T dependence in LCMO-3. Note in this connection that recent attempts to describe magnetic and resonance properties of intrinsically structural/magnetic inhomogeneous LCMO ceramics in the vicinity of their T C by appearance of Griffiths phases [12] or by critical phenomena theory [13] seems to be very questionable. …”

The contribution of grain boundary and defects to the resistivity in the ferromagnetic state of polycrystalline manganites

“…Li et al recently shown that the ferromagnetic clusters exist in the paramagnetic phase in these materials [17]. Hence the resistivity in this regime may be described by twocomponent model as suggested by Rubinstein [18] and Yuan et al [19].…”

Structural, magnetic, magnetocaloric properties and the formation of nano-size Griffiths-like clusters in La0.8Ba0.1Ca0.1Mn0.8Co0.2O3 manganites

“…Several studies have reported the existence of GP regime [8] in different compounds with complex magnetic interactions such as spin glasses, strongly correlated 4f-electrons systems with the non Fermi liquid behavior [9,10], rare earth intermetalic compound Tb 5 Si 2 Ge 2 [11] and perovskite manganites [12][13][14][15]. The competition between metallic FM phases and antiferromagnetic charge-order is considered as a significant factor for rich phase diagrams of these systems.…”