Pressure Effect on the Spin Density Wave Transition in La$_2$PrNi$_2$O$_{6.96}$
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arXiv
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| Natura: | Preprint |
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2025
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| author | Khasanov, Rustem Plokhikh, Igor Hicken, Thomas J. Luetkens, Hubertus Gawryluk, Dariusz J. Guguchia, Zurab |
| author_facet | Khasanov, Rustem Plokhikh, Igor Hicken, Thomas J. Luetkens, Hubertus Gawryluk, Dariusz J. Guguchia, Zurab |
| contents | 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 ($μ$SR) technique. The application of external pressure increases the Néel temperature $T_{\rm N}$ 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 $B_{\rm int}(T)$ (i.e., the magnetic order parameter) follows the power-law relation $B_{\rm int} = B_{\rm int}(0) \left(1 - \left[T/T_{\rm N}\right]^α\right)^β$, with consistent exponent values of $α\simeq 1.95$ and $β\simeq 0.35$ across different pressures. The value of the ordered moments at the Ni sites, which is proportional to $B_{\rm int}$, 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. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2503_06560 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | Pressure Effect on the Spin Density Wave Transition in La$_2$PrNi$_2$O$_{6.96}$ Khasanov, Rustem Plokhikh, Igor Hicken, Thomas J. Luetkens, Hubertus Gawryluk, Dariusz J. Guguchia, Zurab Superconductivity Strongly Correlated Electrons 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 ($μ$SR) technique. The application of external pressure increases the Néel temperature $T_{\rm N}$ 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 $B_{\rm int}(T)$ (i.e., the magnetic order parameter) follows the power-law relation $B_{\rm int} = B_{\rm int}(0) \left(1 - \left[T/T_{\rm N}\right]^α\right)^β$, with consistent exponent values of $α\simeq 1.95$ and $β\simeq 0.35$ across different pressures. The value of the ordered moments at the Ni sites, which is proportional to $B_{\rm int}$, 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. |
| title | Pressure Effect on the Spin Density Wave Transition in La$_2$PrNi$_2$O$_{6.96}$ |
| topic | Superconductivity Strongly Correlated Electrons |
| url | https://arxiv.org/abs/2503.06560 |