Structural anomalies and short-range magnetic correlations in the orbitally degenerated system Sr${}_2$VO${}_4$

Abstract

We report on the electronic ground state of a layered perovskite vanadium oxide Sr${}_2$VO${}_4$ studied by the combined use of synchrotron radiation x-ray diffraction (SR-XRD) and muon spin rotation/relaxation ($\mu$SR) techniques, where $\mu$SR measurements were extended down to 30 mK. We found an intermediate orthorhombic phase between $T_{c2}\sim$~130 K and $T_{c1}\sim$~100 K, whereas a tetragonal phase appears for $T>T_{c2}$ and $T<T_{c1}$. The absence of long-range magnetic order was confirmed by $\mu$SR at the reentrant tetragonal phase below $T_{c1}$, where the relative enhancement in the $c$-axis length versus that of the $a$-axis length was observed. However, no clear indication of the lowering of the tetragonal lattice symmetry with superlattice modulation, which is expected in the orbital order state with superstructure of $d_{yz}$ and $d_{zx}$ orbitals, was observed by SR-XRD below $T_{c1}$. Instead, it was inferred from $\mu$SR that a magnetic state developed below $T_{c0}\sim$~10 K, which was characterized by the highly inhomogeneous and fluctuating local magnetic fields down to 30 mK. We argue that the anomalous magnetic ground state below $T_{c0}$ originates from the coexistence of ferromagnetic and antiferromagnetic correlations.

8 pages, 8 figures, accepted for publication in Physical Review B

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• Peculiarities of magnetic ordering in the S = 5/2 two-dimensional square-lattice antimonate NaMnSbO4
• Frustration-induced quantum criticality in Ni-doped CePdAl as revealed by the $\mu$SR technique
• Identifying materials with charge-spin physics using charge-spin susceptibility computed from first principles