Magnetic structure in square cupola compound Ba(TiO)Cu${}_4$(PO${}_4$)${}_4$: a ${}^{31}$P NMR Study

Abstract

The magnetic structure of the antiferromagnetic square cupola compound Ba(TiO)Cu${}_4$(PO${}_4$)${}_4$ with the tetragonal structure is studied with 31P nuclear magnetic resonance techniques. The magnetic hyperfine shift K shows a clear splitting at the Néel temperature T${}_N$ = 9.5 K, where the resonance splits into two lines when an external magnetic field is oriented along the c axis and into four lines when the field is along the a axis. In the paramagnetic region K(T) follows temperature dependence of the magnetic susceptibility $\chi (T)$. From K vs $\chi$ plot we determined nearly isotropic hyperfine field values Ha_hf = 765 mT/${\mu }_B$ and Hc_hf = 740 mT/${\mu }_B$ for the magnetic field oriented along a and c, respectively. From the rotation of the single crystal in the external magnetic field we determined eight different orientations of K-tensor in the paramagnetic region. In the antiferromagnetic state at T = 6 K we found that the local field at phosphorus is mainly due to dipolar field of coppers. Here the rotation of the single crystal shows eight different orientations of the local field Bint = 35.6 mT. The orientations correspond to the calculation of dipolar fields at phosphorus assuming magnetic quadrupolar configuration of magnetic moments ${\Gamma }_3(1)$ described previously [Nat. Commun. 7, 13039 (2016); Phys. Rev. B 96, 214436 (2017)].

arXiv comment9 pages, 12 figures

References in corpus (8)

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• Magnetic Structural Unit with Convex Geometry: a Building Block Hosting an Exchange-striction-driven Magnetoelectric Coupling
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Cited by in corpus (4)

• Spin-1/2 $XXZ$ Heisenberg cupolae: magnetization process and related enhanced magnetocaloric effect
• High-field phase diagram of the chiral-lattice antiferromagnet Sr(TiO)Cu4(PO4)4
• Microscopic Magnetism of A(TiO)Cu4(PO4)4 (A = Ba, Pb, Sr): 31P and 63,65Cu NMR Study
• Spin dynamics in the square-lattice cupola system Ba(TiO)Cu${}_4$(PO${}_4$)${}_4$