The iridium double perovskite Sr2YIrO6 revisited: A combined structural and specific heat study

Abstract

Recently, the iridate double perovskite Sr${}_2$YIrO${}_6$ has attracted considerable attention due to the report of unexpected magnetism in this Ir${}^{5+}$ (5d${}^4$) material, in which according to the J${}_{eff}$ model, a non-magnetic ground state is expected. However, in recent works on polycrystalline samples of the series Ba${}_{2-x}$Sr${}_x$YIrO${}_6$ no indication of magnetic transitions have been found. We present a structural, magnetic and thermodynamic characterization of Sr${}_2$YIrO${}_6$ single crystals, with emphasis on the temperature and magnetic field dependence of the specific heat. Here, we demonstrate the clue role of single crystal X-ray diffraction on the structural characterization of the Sr${}_2$YIrO${}_6$ double perovskite crystals by reporting the detection of a $\sqrt{2}a\times \sqrt{2}a\times 1c$ supercell, where $a$, $b$ and $c$ are the unit cell dimensions of the reported monoclinic subcell. In agreement with the expected non-magnetic ground state of Ir${}^{5+}$ (5d${}^4$) in Sr${}_2$YIrO${}_6$, no magnetic transition is observed down to 430~mK. Moreover, our results suggest that the low temperature anomaly observed in the specific heat is not related to the onset of long-range magnetic order. Instead, it is identified as a Schottky anomaly caused by paramagnetic impurities present in the sample, of the order of $n\sim 0.5(2)$ \%. These impurities lead to non-negligible spin correlations, which nonetheless, are not associated with long-range magnetic ordering.

arXiv comment20 pages, 10 figures

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Cited by in corpus (28)

• Nature of the magnetism of iridium in the double perovskite Sr2CoIrO6
• Unraveling the nature of magnetism of the 5${\mathbf{d}}^4$ double perovskite Ba${}_2$YIrO${}_6$
• Evidence of discrete energy states and cluster-glass behavior in Sr${}_{2-x}$La${}_x$CoNbO${}_6$
• Magnetism out of disorder in a J=0 compound Ba2YIrO6
• Coupling of lattice, spin and intra-configurational excitations of Eu3+ in Eu2ZnIrO6
• Magnetic properties of double perovskite $L{n}_2$CoIrO${}_6$ ($Ln$ = Eu, Tb, Ho): hetero-tri-spin $3d$-$5d$-$4f$ systems
• Diluted paramagnetic impurities in nonmagnetic Ba${}_2$YIrO${}_6$
• Density matrix renormalization group study of a three-orbital Hubbard model with spin-orbit coupling in one dimension
• Canted ferrimagnetism and giant coercivity in the non-stoichiometric double perovskite La2Ni1.19Os0.81O6
• Evolution of electronic and magnetic properties in a series of iridate double perovskites Pr${}_{2-x}$Sr${}_x$MgIrO${}_6$ ($x$ = 0, 0.5, 1.0)
• Probing the $J_{eff}=0$ ground state and the Van Vleck paramagnetism of the Ir${}^{5+}$ ions in the layered Sr${}_2$Co${}_{0.5}$Ir${}_{0.5}$O${}_4$
• Unconventional magnetism in the 4d${}^4$ based ($S=1$) honeycomb system Ag${}_3$LiRu${}_2$O${}_6$
• Strain induced changes of electronic properties of B-site ordered double perovskite Sr${}_2$CoIrO${}_6$ thin films
• Spin-orbit effects in pentavalent Iridates: Models and materials
• Charge transfer energy in iridates: a hard x-ray photoelectron spectroscopy study
• Spin liquid behavior of a three-dimensional magnetic system Ba${}_3$NiIr${}_2$O${}_9$ with $S$ = 1
• The effect of structural and magnetic disorder on the 3$d$-5$d$ exchange interactions of La${}_{2-x}$Ca${}_x$CoIrO${}_6$
• BCS-BEC crossover in a $(t_{2g}{)}^4$ Excitonic Magnet
• Spin-orbital excitons and their potential condensation in pentavalent iridates
• Revised crystal structure and electronic properties of high dielectric Ba(Fe${}_{1/2}$Nb${}_{1/2}$)O${}_3$ ceramics
• Evidences for the random singlet phase in a new honeycomb iridate SrIr${}_2$O${}_{6-\delta }$
• Evidence for $J_{\mathrm{eff}}=0$ ground state and defect-induced spin glass behaviour in the pyrochlore osmate Y${}_2$Os${}_2$O${}_7$
• Magnetization dynamics fingerprints of an excitonic condensate $t_{2g}^4$ magnet
• Novel Block Excitonic Condensate at $n=3.5$ in a Spin-Orbit Coupled $t_{2g}$ Multiorbital Hubbard Model
• Structural, electronic and magnetic properties of La${}_{1.5}$Ca${}_{0.5}$(Co${}_{0.5}$Fe${}_{0.5}$)IrO${}_6$ double perovskite
• Harmonic oscillators from displacement operators and thermodynamics
• Single crystal growth and magnetism of Sr3NaIrO6 and Sr3AgIrO6: tracking the J = 0 ground state of Ir5+
• Temperature-induced valence-state transition in double perovskite Ba2-xSrxTbIrO6