Role of crystal field ground state in the classical spin-liquid behavior of a quasi-one dimensional spin-chain system Sr3NiPtO6

Abstract

The spin-chain compound Sr3NiPtO6 is known to have a nonmagnetic ground state. We have investigated the nature of ground state of Sr3NiPtO6 using magnetic susceptibility $\chi (T)$, heat capacity $C_{\mathrm{p}}(T)$, muon spin relaxation ($\mu$SR) and inelastic neutron scattering (INS) measurements. The $\chi (T)$ and $C_{\mathrm{p}}(T)$ do not exhibit any pronounced anomaly that can be associated with a phase transition to a magnetically ordered state. Our $\mu$SR data confirm the absence of long-range magnetic ordering down to 0.04 K. Furthermore, the muon spin relaxation rate increases below 20 K and exhibits temperature independent behavior at low temperature, very similar to that observed in a quantum spin-liquid system. The INS data show a large excitation near 8~meV, and the analysis of the INS data reveals a singlet CEF ground state with a first excited CEF doublet state at ${\Delta }_{\mathrm{CEF}}$ = 7.7 meV. The estimated CEF parameters reveal a strong planar anisotropy in the calculated $\chi (T)$, consistent with the reported behavior of the $\chi (T)$ of single crystal Sr3NiPtO6. We propose that the nonmagnetic singlet ground state and a large ${\Delta }_{\mathrm{CEF}}$ (much larger than the exchange interaction ${\mathcal{J}}_{\mathrm{ex}}$) are responsible for the absence of long-range magnetic ordering and can mimic a classical spin-liquid behavior in this quasi-1D spin chain system Sr3NiPtO6. The classical spin-liquid ground state observed in Sr3NiPtO6 is due to the single-ion property, which is different from the quantum spin-liquid ground state observed in geometrically frustrated systems, where two-ion exchanges play an important role.

arXiv comment11 pages, 10 figures, 1 table

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Cited by in corpus (1)

• $J_{eff}$ states in a quasi one dimensional antiferromagnetic spin chain hexagonal Iridates Sr${}_3$MIrO${}_6$ (M=Mg, Zn, Cd): an $ab-initio$ comparative perspective