15th International Conference on Muon Spin Rotation, Relaxation and Resonance

Magnetic Properties of LiFePO4 under Hydrostatic Pressure

P-MON-37

29 Aug 2022, 17:20

1h 40m

Science and Technology Campus, University of Parma

Poster Strongly correlated electron systems Posters

Speaker

Ugne Miniotaite (KTH Royal Institute of Technology)

Description

${\mathrm{LiFePO}}_4$ (LFPO) is an archetypical and well-known cathode material [1] for rechargeable Li-ion batteries. However, its quasi-one-dimensional (Q1D) structure (see Figure) along with the Fe ions, LFPO also displays interesting low-temperature magnetic properties [2]. At ambient pressure LFPO display an antiferromagnetic (AFM) spin order below $T_N=53\mathrm{K}$ and neutron scattering [3-5] have characterized that LFPO orders in a canted AFM ground state below $T_N$. Our team has previously utilized muon spin rotation (${\mu }^{+}$SR) to investigate both magnetic order as well as Li-ion diffusion in LFPO [6] as well as nano-structured LFPO [7,8] and related compounds [9-11]. In this initial study we make use of high-pressure ${\mu }^{+}$SR to investigate effects on the low-T magnetic order. We find a clear decrease in $T_N$ at $p=20\mathrm{kbar}$ and we can estimate that a complete suppression of magnetic order should appear around $p_c\approx 300\mathrm{kbar}$.

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