Pressure Effect on the Spin Density Wave Transition in La${}_2$PrNi${}_2$O${}_{6.96}$

Abstract

High-pressure studies reveal a stark contrast between the superconducting properties of double-layer Ruddlesden-Popper (RP) nickelates La${}_2$PrNi${}_2$O${}_7$ and La${}_3$Ni${}_2$O${}_7$. While La${}_2$PrNi${}_2$O${}_7$ exhibits bulk superconductivity, La${}_3$Ni${}_2$O${}_7$ displays filamentary behavior, suggesting that superconductivity is confined to phase interfaces rather than the bulk. Since magnetism emerges near the superconducting phase, understanding its differences in La${}_3$Ni${}_2$O${}_7$ and La${}_2$PrNi${}_2$O${}_7$ is essential for clarifying their underlying electronic and magnetic properties. In this work we study the magnetic responce of La${}_2$PrNi${}_2$O${}_{6.96}$ under pressures up to 2.3 GPa using the muon-spin rotation/relaxation ($\mu$SR) technique. The application of external pressure increases the Néel temperature $T_{\mathrm{N}}$ from approximately 161 K at ambient pressure ($p=0$) to about 170 K at $p=2.3$ GPa. The temperature dependence of the internal magnetic field $B_{\mathrm{int}}(T)$ (i.e., the magnetic order parameter) follows the power-law relation $B_{\mathrm{int}}=B_{\mathrm{int}}(0){\left(1-{\left[T/T_{\mathrm{N}}\right]}^{\alpha }\right)}^{\beta }$, with consistent exponent values of $\alpha \simeq 1.95$ and $\beta \simeq 0.35$ across different pressures. The value of the ordered moments at the Ni sites, which is proportional to $B_{\mathrm{int}}$, remain unaffected by pressure. Our findings suggest that the magnetic properties of double-layer RP nickelate La${}_3$Ni${}_2$O${}_7$ are broadly unaffected by Pr to La substitution.

7 pages, 3 figures

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Cited by in corpus (1)

• Strain-Engineered Electronic Structure and Superconductivity in La${}_3$Ni${}_2$O${}_7$ Thin Films