Phase separation inNd1−xSrxCoO

The exchange bias effect in phase separated Nd1−xSrxCoO3at the spontaneous ferromagnetic/ferrimagnetic interface

“…We do not observe any impurity phase in the x-ray diffraction patterns, which are shown in Fig. 1 [21] The average size of the particles is found around ∼ 150.0 nm for both the cases, which was observed by a Transmission Electron Microscope (TEM), model ZEOL JEM-2010. The dc magnetization was measured using a commercial superconducting quantum interference device (SQUID) magnetometer (MPMS, XL).…”

“…The values of T F I and T c in the present observation are reproduced exactly as compared to the values reported by Stauffer et al [16] The reported experimental results including the neutron and 59 Co NMR results clearly indicate the coexistence of FM and FI phases at low temperature in Nd 1−x Sr x CoO 3 for x ≥ 0.20. [16,17,18,19,20,21] Thus, the magnetization loops at 5 K should have two components corresponding to the FM and FI phases. Recently, Niebieskikwiat and Salamon reported the EB effect in Pr 1/3 Ca 2/3 MnO 3 consisting of FM and AFM phases at low temperature, where the AFM background exhibiting linear M − H response was subtracted from the overall magnetization loop at 5 K to get the evident features of the horizontal and vertical shifts.…”

Heat conductivity and thermopower of Nd1−xSrxCoO3 ceramic

“…However, that reasoning would also negate the existence of those mixtures in NdCoO 3 . Indeed, for the base compound recently a LS Co 3+ state has been proposed to exist from T = 0 up to 500 K [11,33]. Note, however, that the steep drop in κ(T) for x = 0 appears to reach down to the κ-values of x = 0.2, suggesting an equivalent phonon-phonon scattering situation-possibly a different spin state mixture-is installed near T s .…”

“…The disks were sintered in air for 6 h at 1200 • C, followed by cooling to room temperature with a rate of 100 K/h. Powder X-ray diffraction spectra revealed an orthorhombic Pbnm unit cell and the lattice parameters are given in [6,33]. While there is a steady increase of both the lattice volume V and the c/a-ratio up to x = 0.2, for x > 0.2 for both one observes a saturation tendency, suggesting that some chemo-structural reconfiguration takes place inside the orthorhombic lattice even before metallic conduction occurs.…”

“…The figure shows that there is a difference in the M(T)-curves between field cooled and zero field cooled conditions: they coincide only for higher temperatures T c > T > T f . Some magnetic parameters [6,33] are listed in Table 1. The Curie temperature T c was taken as the strongest slope of M(T).…”