Abstract
The ferromagnetic (FM) nature of the metallic LaCo2P2 was investigated with the positive muon spin rotation, relaxation and resonance (μ +SR) technique. Transverse and zero field μ + SR measurements revealed that the compound enters a long range FM ground state at 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 LaCo2P2 is a paramagnet at higher temperatures T > 160 K, it enters a short range ordered (SRO) magnetic phase for K. Measurements below the vicinity of revealed that the SRO phase co-exists with the long range FM order at temperatures 124 K . Such co-existence is an intrinsic property and may be explained by an interplay between spin and lattice degree of freedoms.
Highlights
Ac La P Co μ1 μ2 μ3 c a b b a cRef. [14]
The presentation of the μ+ SR results of LaCo2 P2 is divided into sections based on the type of field configuration chosen for the μ+ SR experiments: transverse field (TF) or zero field (ZF)
The ZF time spectra collected at base temperature is reproduced based on the published magnetic structure and muon site determined from density functional theory (DFT) calculations
Summary
The predicted muon sites by DFT calculations are indicated as spheres: red μ1 at (0,0,0.198), orange μ2 at (0,0.5,0.102) and purple μ3 at (0,0,0.5). The coordinates are specified for the crystal space group I4/mmm (#139): a =. The magnetic moments are indicated as blue arrows within the CoP-polyhedra
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