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25 April 2024 |
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The iridium double perovskite Sr2YIrO6 revisited: A combined structural and specific heat study | | L.T. Corredor
; G. Aslan-Cansever
; M. Sturza
; Kaustuv Manna
; A. Maljuk
; S. Gass
; A. Zimmermann
; T. Dey
; C. G. F. Blum
; M. Geyer
; A. U. B. Wolter
; S. Wurmehl
; B. Buechner
; | | Date: |
16 Jun 2016 | | 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 $sqrt{2}a imes sqrt{2}a imes 1c$ 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. | | Source: | arXiv, 1606.5104 | | Services: | Forum | Review | PDF | Favorites | |
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