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Ferromagnetic clusters in the spin glass matrix in layered LaSrCoO$_4$ | | Abdul Ahad
; D. K. Shukla
; K. Gautam
; S. S. Majid
; K. Dey
; A. Tripathy
; F. Rahman
; R. J. Choudhary
; E. Welter
; S. N. Kaul
; | | Date: |
1 Feb 2020 | | Abstract: | LaSrCoO$_4$ (Co$^{3+}$) is an intermediate between antiferromagnetic (AFM)
La$_2$CoO$_4$ (Co$^{2+}$) and ferromagnetic (FM) Sr$_2$CoO$_4$ (Co$^{4+}$). It
is fascinating because of its complex magnetic interactions. The appearance of
Co$^{3+}$ which is not present in the end compounds makes it intriguing because
of the spin-state transitions associated with it. Here we report that
LaSrCoO$_4$ exhibits FM clusters in the spin glass matrix. Critical exponents
$eta$, $gamma$ and $eta$ classifies the system as having a mean field model
interactions but close to inter-metallic systems where magnetic anisotropy
plays a role. Mutually self consistent magnetic measurements and analysis
support ordering of the FM clusters and its freezing at $sim$ 220 K and 8 K,
respectively. FM clusters and spin glass matrix are formed of Co$^{3+}$ high
spin (HS) and a mix of Co$^{3+}$ HS $&$ Co$^{3+}$ LS, respectively. The
presence of Co$^{3+}$ HS in the matrix of the Co$^{3+}$ low spin (LS) has been
confirmed through extended X-ray absorption fine structure (EXAFS)
spectroscopy. | | Source: | arXiv, 2002.0135 | | Services: | Forum | Review | PDF | Favorites | |
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