Electronic and magnetic ground state of 4$d^3$ double perovskite ruthenates A$_2$LaRuO$_6$ (A $=$ Ca, Sr, Ba)

Asha Ann Abraham; Roumita Roy; Ruta Kulkarni; Sudipta Kanungo; Soham Manni

doi:10.1088/1361-648X/adfb3d

paper

Electronic and magnetic ground state of 4 $d^{3}$ double perovskite ruthenates A $_{2}$ LaRuO $_{6}$ (A $=$ Ca, Sr, Ba)

arXiv:2406.08873 · doi:10.1088/1361-648X/adfb3d

Abstract

4 $d$ transition metal oxide (TMO) offers an intriguing puzzle for their electronic and magnetic ground state. They are in the cross-over regime of strong spin orbit interaction (SOI) and electron-electron correlation ( $U$ ) with quenched orbital angular momentum. Our work unravels the electronic and magnetic ground state of the less investigated 4 $d^{3}$ double perovskite ruthenates A $_{2}$ LaRuO $_{6}$ (A = Ca, Ba). The negligible effect of SOI is evident from the bulk magnetic, specific heat measurements and density functional theory (DFT) calculations, indicating a classical spin-only magnetic ground state ( $S$ = 3/2) for the materials. Magnetization measurements show that both materials have long range antiferromagnetic order with high degree of magnetic frustration ( $f$ $\approx$ 13 -15). Interestingly, a near $T^{2}$ - behavior is observed in low- $T$ magnetic heat capacity measurement, indicating the presence of low-dimensional spin-wave exciation and magnetic frustration in both materials. The temperature dependent resistivity measurements and electronic band structure calculations confirm a conventional Mott insulating ground state in these two systems. Moreover, our experimental investigation and DFT calculations highlight the reason for the nonexistence of Sr $_{2}$ LaRuO $_{6}$ .

11 pages, 12 figures, 5 tables

Electronic and magnetic ground state of 4d3 double perovskite ruthenates A2​LaRuO6​ (A = Ca, Sr, Ba)

Abstract

References in corpus (10)

Electronic and magnetic ground state of 4 $d^{3}$ double perovskite ruthenates A $_{2}$ LaRuO $_{6}$ (A $=$ Ca, Sr, Ba)