Co-existence of short- and long-range magnetic order in LaCo${}_2$P${}_2$

Abstract

The ferromagnetic (FM) nature of the metallic LaCo${}_2$P${}_2$ was investigated with the positive muon spin rotation, relaxation and resonance (${\mu }^{+}$SR) technique. Transverse and zero field ${\mu }^{+}$SR measurements revealed that the compound enters a long range FM ground state at $T_{\mathrm{C}}=130.91(65)$~K, consistent with previous studies. Based on the reported FM structure, the internal magnetic field was computed at the muon sites, which were predicted with first principles calculations. The computed result agree well with the experimental data. Moreover, although LaCo${}_2$P${}_2$ is a paramagnet at higher temperatures $T>160$~K, it enters a short range ordered (SRO) magnetic phase for $T_{\mathrm{C}}<T\le 160$~K. Measurements below the vicinity of $T_{\mathrm{C}}$ revealed that the SRO phase co-exists with the long range FM order at temperatures $124\le T\le T_{\mathrm{C}}$. Such co-existence is an intrinsic property and stems from competition between the 2D and 3D interactions/fluctuations.

9 pages, 7 figures

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• Interplay of Rare Earth and Iron magnetism in RFeAsO with R = La, Ce, Pr, and Sm: A muon spin relaxation study and symmetry analysis
• Competition of magnetism and superconductivity in underdoped (Ba1-xKx)Fe2As2
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• Short-range magnetic ordering process for the triangular lattice compound NiGa2S4: a positive muon spin rotation and relaxation study

Cited by in corpus (2)

• Influence of the Magnetic Sub-Lattices in the Double Perovskite Compound LaCaNiReO${}_6$
• Pressure driven magnetic order in Sr${}_{1-x}$Ca${}_x$Co${}_2$P${}_2$