Source capture
Authors Yong-Cheng Pan, Tommy Kotte, Toni Helm, Motoki Osada, Atsushi Tsukazaki, Yu-Te Hsu
arXiv / Publisher https://arxiv.org/abs/2603.17451
PDF https://arxiv.org/pdf/2603.17451
Relevance score 5.238
Primary category cond-mat.supr-con
Published 2026-03-19
Research paradigm Experimental
Sample form Thin Film

Summary

We report systematic magnetotransport measurements on high-crystallinity overdoped infinite-layer nickelate La1-xSrxNiO2 thin films (x = 0.20–0.24), revealing two prominent normal-state features in pulsed magnetic fields up to 62 T: the magnetoresistance violates Kohler's rule and exhibits H-linear behavior at high H/T limits, while the normal-state resistivity consistently follows a T2 dependence below 30 K. These results demonstrate the coexistence of H-linear magnetoresistance and T2 resistivity in this model unconventional superconductor, providing new insights into the transport properties of the normal ground state that hosts superconductivity in infinite-layer nickelates.

Materials

Methods

Keywords

  • h linear magnetoresistance
  • t2 resistivity
  • fermi liquid ground state
  • strange metal
  • kohler's rule violation
  • overdoped regime
  • pseudogap phase

Highlights

  • Demonstrates coexistence of H-linear MR and T2 resistivity in a model unconventional superconductor.
  • Provides new insights into the normal ground state transport that hosts superconductivity in infinite-layer nickelates.
  • Contrasts with Nd-based counterpart which shows unconventional power laws.

Conclusions

  • The magnetoresistance does not follow Kohler's rule but exhibits H-linear behavior in the high H/T limit.
  • The normal-state resistivity below 30 K consistently follows a T2 behavior across the overdoped regime.
  • There is coexistence of H-linear magnetoresistance and T2 resistivity in overdoped LSNO.
  • The results point to a possible impact of rare-earth magnetism on the ground-state transport characteristics.

Main claims

  • The magnetoresistance of overdoped LSNO does not follow Kohler's rule and exhibits H-linear behavior in the high H/T limit.
    • Evidence: Abstract,Full text: the magnetoresistance does not follow the Kohler's rule but exhibits a H-linear behavior in the high H/T limit.
  • The normal-state resistivity below 30 K consistently follows a T2 behavior across the overdoped regime.
    • Evidence: Abstract,Full text: the normal-state ρ(T) below 30 K consistently follows a T2 behavior across the overdoped regime.
  • This coexistence of H-linear MR and T2 resistivity is distinct from the Nd-counterpart and highlights the impact of rare-earth magnetism.
    • Evidence: Full text,Section IV: Compared to its Nd-counterpart… LSNO exhibits distinct transport behavior in both its T- and H-dependence.

Workflow

  • sample_preparation
    • Materials: La1-xSrxNiO2; SrTiO3 substrate; CaH2
    • Methods: pulsed laser deposition; topotactic reduction
    • Observations: high-crystallinity thin films with x=0.20-0.24
  • magnetotransport_measurement
    • Methods: four-probe resistivity; pulsed magnetic field up to 62T
    • Observations: field-induced normal state
  • data_analysis
    • Methods: Kohler plot analysis; scaling analysis (MR vs H/T)
    • Observations: MR does not follow Kohler's rule; H-linear MR in high H/T limit; normal-state resistivity follows T2 below 30K
  • interpretation — Overdoped LSNO exhibits coexistence of H-linear MR and T2 resistivity, suggesting strange-metal and Fermi-liquid features.