Magnetic frustration and dielectric relaxation in insulating Nd2NiMnO6 double perovskites

Abstract

Articles you may be interested inEffect of Cu substitution on the magnetic and dielectric properties of La2NiMnO6We have investigated structural, dielectric, and magnetic properties of polycrystalline double perovskite Nd 2 NiMnO 6 compound. The compound crystallizes in monoclinic P2 1 =n symmetry and is partially B-site disordered depending on the synthesis conditions. It undergoes second-order ferromagnetic transition at 192 K and shows glassy behaviour at low temperature. The glassy phase is due to anti-site disorder within the homogeneous sample. Temperature and frequency dependent dielectric measurements reveal colossal values of dielectric constant and is best interpreted using Maxwell-Wagner interfacial polarization model. Impedance spectroscopy has been used to analyse the intrinsic dielectric response. This enabled us to differentiate the conduction process at the grain and grain boundaries. Arrhenius behaviour is favoured at the grain boundary, while variable range hopping mechanism is considered most suitable within the grain region. dc conductivity measurements corroborate variable range hopping conduction. V C 2015 AIP Publishing LLC.

On the structural and magnetic properties of the double perovskite $$\hbox {Nd}_{2}\hbox {NiMnO}_{6}$$

“…A rapid increase of the magnetization as a function of temperature is observed below 200 K, reflecting the ferromagnetic interaction of the Ni/Mn ions along the Mn 4+ -O-Ni 2+ bonds of the structure ( T C ∼ 195 K). The temperature-dependent magnetization shows two additional features, a weak inflection near 100 K (more evident in the ZFC data presented in inset) and a downturn below 50 K. The low field behavior of the sample is similar to that reported previously [5][6][7]31]. The sharpness and magnitude of the anomaly near 100 K possibly reflects the amount of antisite disorder ( [5,6].…”

“…Two magnetic transitions have been reported to occur in Nd 2 NiMnO 6 (NNMO) [5,6]. A high temperature ferromagnetic transition and a magnetic anomaly at lower temperatures interpreted to indicate a magnetic phase transition.…”

Magnetocaloric properties of R2NiMnO6 (R=Pr, Nd, Tb, Ho and Y) double perovskite family

“…All the systems therefore are in pure phase according to X-ray diffraction results. The refined patterns are reported or will be published elsewhere [14,15,16,17].…”

Spin reorientation inNdFe0.5Mn0.5O3: Neutron scattering andab initiostudy

“…Besides the observed magnetic behavior is entirely different from that expected from a double perovskite compound which predominantly show ferromagnetism e.g. in R 2 MnBO 6 (R=La,Nd and B=Ni,Co) [33,[41][42][43]. This information indicates the possible phase formation of NFMO with orthorhombic symmetry.…”

“…In this situation, one would expect a very complex interplay of spin, lattice, orbital degrees of freedom between the Mn and Fe sublattices and hence a new set of enriching physical properties. Substitution of Mn 3+ ions at the Fe site not only makes it J-T active, it also tunes the super exchange interaction, influences the magnetic symmetry and spin reorientation through the Mn-Fe, Nd-Mn and Nd-Fe interactions [31][32][33]. The electron-phonon coupling will also change due to change in J-T interaction upon doping.…”