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Magnetic properties and revisited exchange integrals of the frustrated chain cuprate PbCuSO$_4$(OH)$_2$ - linarite | | A.U.B. Wolter
; F. Lipps
; M. Schäpers
; S.-L. Drechsler
; S. Nishimoto
; R. Vogel
; V. Kataev
; B. Büchner
; H. Rosner
; M. Schmitt
; M. Uhlarz
; Y. Skourski
; J. Wosnitza
; S. Süllow
; K.C. Rule
; | | Date: |
21 Oct 2011 | | Abstract: | We present a detailed study in the paramagnetic regime of the frustrated $s$
= 1/2 spin-compound linarite, PbCuSO$_4$(OH)$_2$, with competing ferromagnetic
nearest-neighbor and antiferromagnetic next-nearest-neighbor exchange
interactions. Our data reveal highly anisotropic values for the saturation
field along the crystallographic main directions, with $sim$ 7.6, $sim$ 10.5
and $sim$ 8.5,T for the $a$, $b$, and $c$ axes, respectively. In the
paramagnetic regime, this behavior is explained mainly by the anisotropy of the
extit{g}-factor but leaving room for an easy-axis exchange anisotropy. Within
the isotropic $J_1$-$J_2$ spin model our experimental data are described by
various theoretical approaches yielding values for the exchange interactions
$J_1$ $sim$ -100,K and $J_2$ $sim$ 36,K. These main intrachain exchange
integrals are significantly larger as compared to the values derived in two
previous studies in the literature and shift the frustration ratio $alpha =
J_2/|J_1|$ $approx$ 0.36 of linarite closer to the 1D critical point at 0.25.
Electron spin resonance (ESR) and nuclear magnetic resonance (NMR) measurements
further prove that the static susceptibility is dominated by the intrinsic spin
susceptibility. The Knight shift as well as the broadening of the linewidth in
ESR and NMR at elevated temperatures indicate a highly frustrated system with
the onset of magnetic correlations far above the magnetic ordering temperature
$T_mathrm{N}$ = 2.75(5),K, in agreement with the calculated exchange
constants. | | Source: | arXiv, 1110.4729 | | Services: | Forum | Review | PDF | Favorites | |
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