Enhanced magnetoresistance in the complex perovskite LaCu3Mn4O12

Abstract

Moderate-pressure techniques (P=2 GPa) have been used to prepare the complex LaCu3Mn4O12 perovskite. It has been characterized by neutron powder diffraction, magnetic, and magnetotransport measurements. This material is ferrimagnetic below TC=361 K. The magnetoresistance (MR) is enhanced with respect to that of CaCu3Mn4O12 due to the effective electronic injection that dramatically reduces the bulk resistivity, thus promoting the grain-boundary contribution to the electrical resistance. Values of low-field MR close to 3% at room temperature are achieved for magnetic fields of 1 T.

A half-metallic A- and B-site-ordered quadruple perovskite oxide CaCu3Fe2Re2O12 with large magnetization and a high transition temperature

“…The A-and B-site-ordered quadruple perovskite-structure oxide is derived from the A-site-ordered perovskite with general formula AA [31][32][33] . In the present study we prepared an AA (10 GPa) and high temperature (1400 K), as described in Methods.…”

Material Design and High-Pressure Synthesis of Novel A-Site-Ordered Perovskites AMn3Al4O12 (A = Y, Yb, and Dy) with Square-Planar-Coordinated Mn3+

“…As shown in Figure 4, magnetic transitions were not clearly seen in the magnetic susceptibility measurements for YbMn 3 …”

“…Formation of the A-site-order perovskite phase was checked by X-ray diffraction using Cu K¡ radiation. Synchrotron X-ray diffraction patterns of the polycrystalline AMn 3 Al 4 O 12 samples were also collected on a DebyeScherrer camera installed at beamline BL02B2 of SPring-8 in Japan, with a wavelength of 0.778256 ¡ for DyMn 3 17 Magnetic properties were measured using a SQUID magnetometer (Magnetic Property Measurement System, Quantum Design), and specific heat measurements were done by the thermal relaxation method (Physical Property Measurement System, Quantum Design).…”

μSR investigation of magnetically ordered states in theA-site ordered perovskite manganitesRBaMn2Kawasaki1, Minami2, Izumi3 et al. 2012Phys. Rev. B4030View full textAdd to dashboardCite

“…23 The mismatch of lattice parameters a, b between the A-site ordered and the disordered structures is very small, as it is the case for the RuddlesdenPopper series of layered perovskites. The coexistence of the two, therefore, may take the form of intergrowth, where the layers of the minority structure are intercalated in the other, as has been identified in the doublelayer manganites (La 1−z Pr z ) 1 34 This type of random arrangements of the layers may be the origin of inhomogeneous spin dynamics in the FM phase of LaBaMn 2 O 6 and possible Griffiths phase phenomenon. 35 We cannot make a definite statement in our case.…”