Magnetic Properties and Structural Evolution in Nd_0.5Sr_1.5MnO₄

Abstract

The structural properties of single crystals of R0.5Sr1.5MnO4 (R = La, Pr, and Nd) grown by the floating zone method have been studied using the neutron diffraction technique. In particular, the structure and its correlation with the magnetic properties have been investigated for Nd0.5Sr1.5MnO4 by using both the neutron diffraction technique and the magnetization measurement as a function of temperature. An antiferromagnetic ordering appears to develop at about 130 K in the magnetization data, which coincides with the superlattice peaks shown in the neutron powder diffraction patterns below this temperature. The enhancement of the magnetization below 21 K is likely to be associated with the spin glasslike ordering of the Nd cations. With decreasing temperature, the axial Mn−O(2) bond distance shortens abruptly at the critical temperatures, accompanied by reducing the Jahn−Teller distortion. This behavior is evident that the magnetic transitions in Nd0.5Sr1.5MnO4 are strongly correlated with the structural variations.

Synthesis and Structural and Magnetic Characterization of Mixed Manganese−Copper n = 1 Ruddlesden−Popper Phases

“…The decrease in unit cell volume as Pr 3+ and Nd 3+ replace La 3+ on the A site is expected, due to the decrease in lanthanide cationic radius. These results are similar to the observations made by Hong et al of the pure manganese system, although in contrast to their study, these manganese−copper materials show a more isotropic decrease in unit cell parameters as a function of lanthanide cationic radius (possibly due to the absence of magnetic ordering of the lanthanide moments in these systems).…”

“…These measurements suggest that the magnetic behavior of LnSrMn 0.5 Cu 0.5 O 4 is very similar for Ln = La, Pr, Nd, with the lanthanide cation not influencing the magnetic ordering. This is in contrast to the system Nd 0.5 Sr 1.5 MnO 4 , in which the moments on the Nd 3+ cation order at 21 K . The absence of magnetic ordering on the lanthanide sublattice in these mixed manganese−copper systems may be a result of the increased disorder of the system.…”

Structural, electrical, magnetic, and thermal studies of Cr-doped La0.7Ca0.3Mn1−xCrxO3 (≤x≤1) manganites

“…6. 20 With an increase in Cr doping other magnetic states such as mixed FM and AFM are observed. The coexistence of FM and AFM states is supported by M-T and M-H curves.…”

The phase diagram and crystal chemistry of strontium-doped rare earth cobaltates: Ln2−xSrxCoO4+δ (Ln=La–Dy)

“…Properties such as high-temperature superconductivity [1] and colossal magneto-resistance [2] have led to the extensive study of strontium-doped Ln 2−x Sr x MO 4 phases (Ln = rare earth ions; M = Mn, Ni, and Cu) [3][4][5][6][7][8][9][10][11][12][13][14][15]. With the exception of the La 2−x Sr x CoO 4 compounds [16][17][18][19][20][21], other rare earth cobaltbased K 2 NiF 4 phases have received relatively little attention [21,22].…”