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Diluted paramagnetic impurities in nonmagnetic Ba$_2$YIr$_6$ | | F. Hammerath
; R. Sarkar
; S. Kamusella
; C. Baines
; H.-H. Klauss
; T. Dey
; A. Maljuk
; S. Gaß
; A.U.B. Wolter
; H.-J. Grafe
; S. Wurmehl
; B. Büchner
; | | Date: |
19 Jul 2017 | | Abstract: | The cubic double perovskite Ba$_2$YIr$_6$ has been investigated by the local
probe techniques nuclear magnetic resonance ($^{89}$Y NMR) and muon spin
rotation (muSR). Both methods confirm the absence of magnetic long-range order
in this compound but find evidence for diluted localized paramagnetic moments.
NMR spin-lattice relaxation rate 1/T1 measurements suggest a slowing down of
localized spin moments at low temperatures. An increase of the muSR
spin-lattice relaxation rate lambda confirms the presence of weak magnetism in
Ba$_2$YIr$_6$ . However, these findings cannot be explained by the recently
suggested excitonic type of magnetism. Instead, they point towards tiny amounts
of localized paramagnetic spin centers leading to this magnetic response on the
background of a simple nonmagnetic ground state of the 5d$^4$ ($J=0)$
electronic configuration of Ir$^{5+}$. | | Source: | arXiv, 1707.6027 | | Services: | Forum | Review | PDF | Favorites | |
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