Synthesis and magnetic properties of spin-$\frac{3}{2}$ $γ$-phase of SrCo$_{2}$(PO$_{4}$)$_{2}$ antiferromagnet

Arvind Yogi; T. Chakrabarty; P. L. Paulose; Ruta Kulkarni; Mayanak Kumar Gupta; Arumugam Thamizhavel

paper

Synthesis and magnetic properties of spin- $\frac{3}{2}$ $γ$ -phase of SrCo $_{2}$ (PO $_{4}$ ) $_{2}$ antiferromagnet

arXiv:1804.03464

Abstract

We report on the synthesis of a new $γ$ -phase of the spin $S$ ~=~ $\frac{3}{2}$ compound SrCo $_{2}$ (PO $_{4}$ ) $_{2}$ together with a detailed structural, magnetic and thermodynamic properties. The $γ$ -phase of SrCo $_{2}$ (PO $_{4}$ ) $_{2}$ crystallizes in a triclinic crystal structure with the space group $P 1 ˉ$ . Susceptibility and specific heat measurements reveal that SrCo $_{2}$ (PO $_{4}$ ) $_{2}$ orders antiferromagnetically below $T_{N} ≃ 8.5$ \,K and the nature of ordering is three dimensional (3D). The magnetic isotherm at temperatures below $T_{N}$ shows a field-induced spin-flop transition, related to the magnetocrystalline anisotropy, at an applied field of $\sim$ ~4.5~Tesla. Remarkably, heat capacity shows magnetic-field-induced transitions at $T_{N1}$ = 3.6 K and $T_{N2}$ = 7.4 K. The magnetic long range ordering (LRO) is also confirmed in both the Knight shift and spin-lattice relaxation rate ( $1/ T_{1}$ ) of the $^{31}$ P-NMR measurements. However, below the LRO we have not detected any NMR signal due to faster relaxation. We have detected two structurally different phosphorous sites in $γ$ -phase of SrCo $_{2}$ (PO $_{4}$ ) $_{2}$ and they shift differently with temperature.

We have suspicion that there are some experimental artifact which gone unnoticed during our measurements. Now we want re-measure and then we will again resubmit here

Synthesis and magnetic properties of spin-23​ γ-phase of SrCo2​(PO4​)2​ antiferromagnet

Abstract

Synthesis and magnetic properties of spin- $\frac{3}{2}$ $γ$ -phase of SrCo $_{2}$ (PO $_{4}$ ) $_{2}$ antiferromagnet