来源 自动抓取、Zotero
作者 Zhi Xiang Chong, Joong-Mok Park, Shuyuan Huyan, Avinash Khatri, Martin Mootz, Xinglong Chen, Daniel P. Phelan, Liang Luo, Ilias E. Perakis, J. F. Mitchell, Sergey L. Bud'ko, Paul C. Canfield, Jigang Wang
arXiv / 出版方 http://arxiv.org/abs/2604.16611v1
PDF https://arxiv.org/pdf/2604.16611v1
相关度评分 5.012
主分类 本批次暂无数据。
发布日期 2026-04-17
研究范式 实验研究
样品形态 单晶

摘要

本研究开发了可在高达40 GPa、7 T磁场和5 K低温下同时工作的超快磁压力光谱平台，并将其应用于三层镍酸盐Pr4Ni3O10中准粒子动力学的磁压力演化探测。实验观察到电荷密度波（CDW）转变附近准粒子弛豫出现显著的临界减慢现象，该现象在施加压力后消失。在更高压力下，低温弛豫时间反而变长，与初始超导关联特征一致。然而，高达7 T的磁场几乎不改变弛豫行为，且未观察到涡旋诱导的预瓶颈动力学——后者在对照体超导样品中是稳健特征——表明当前压力条件下可能的超导态并非体态，而是丝状或强不均匀的。该磁压力超快能力为解决关联量子材料中压力诱导超导电性与交织有序的悬而未决问题开辟了新途径。

材料

方法

  • ultrafast pump-probe spectroscopy
  • diamond anvil cell (DAC)
  • magneto-cryostat
  • ultrafast spectroscopy under high pressure and high magnetic field

关键词

亮点

  • The developed ultrafast magneto-pressure spectroscopy platform operates up to 40 GPa, 7 T, and 5 K.
  • No vortex-induced pre-bottleneck dynamics are detected, ruling out bulk superconductivity in the measured pressure range.
  • First implementation of simultaneous high-pressure, high-magnetic-field, cryogenic femtosecond spectroscopy.

结论

  • A pronounced critical slowing down near the CDW transition disappears upon pressure application.
  • At higher pressures, the low-temperature relaxation time lengthens, consistent with incipient superconducting correlations, but magnetic field dependence is negligible, suggesting filamentary or inhomogeneous superconductivity.
  • The charge-density-wave transition shows critical slowing down that collapses under pressure.
  • At higher pressures, relaxation lengthens at low temperature, suggesting incipient superconducting correlations.
  • Absence of field dependence up to 7 T indicates any superconducting state is likely non-bulk or inhomogeneous.

主要论断

  • The charge-density-wave order in Pr4Ni3O10 is suppressed by applied pressure, and low-temperature relaxation dynamics lengthen at high pressures
    • 证据: At4.2 GPa, pronounced critical slowing down near CDW transition; at 38 GPa, no anomaly; relaxation time increases with pressure at 5K
  • Any superconductivity under pressure is not bulk, as no magnetic-field-dependent vortex dynamics are observed up to 7T
    • 证据: ΔR/R remains unchanged at 14 GPa and 5 K for fields up to 7 T, in contrast to bulk Nb control sample
  • Development of ultrafast magneto-pressure spectroscopy (up to 40 GPa, 7 T, 5 K) enables direct probing of quasiparticle dynamics under extreme conditions.
    • 证据: Detailed description of setup and first application to Pr4Ni3O10.
  • The CDW transition in Pr4Ni3O10 shows critical slowing down of QP relaxation, which collapses under applied pressure.
    • 证据: Temperature-dependent ∆R/R maps at 4.2 GPa show pronounced slowing near 120 K; at 38 GPa no anomaly.
  • At higher pressures, prolonged QP relaxation at low temperature is consistent with incipient superconducting correlations, but the negligible magnetic-field-dependence and absence of vortex-induced pre-bottleneck dynamics indicate non-bulk or filamentary superconductivity.
    • 证据: No discernible change in ∆R/R with magnetic field up to 7 T; comparison to Nb sample shows clear field dependence.

研究流程

  • Sample preparation and high-pressure setup — CDW critical slowing down collapses under pressure
    • 材料: Pr4Ni3O10 single crystals; DAC with 400 μm culets
    • 方法: Ultrafast pump-probe with simultaneous pressure (up to 40 GPa) and magnetic field (up to 7 T)
    • 观察: ΔR/R temporal dynamics
  • Data analysis — Superconductivity is not bulk; likely filamentary
    • 方法: Exponential fits; Rothwarf-Taylor model
    • 观察: High-pressure low-temperature prolonged relaxation; No magnetic field dependence up to 7T
  • Sample Preparation — Pr4Ni3O10 is suitable for high-pressure studies.
    • 材料: Pr4Ni3O10 single crystals
    • 方法: floating zone growth under 140 bar O2
    • 观察: high-quality single crystals with minimal stacking faults
  • High-Pressure Diamond Anvil Cell (DAC) Setup — Ultrafast magneto-pressure spectroscopy is developed.
    • 材料: Pr4Ni3O10 flake ≈120x120x10 µm3; Be-Cu DAC; Nujol mineral oil
    • 方法: loading in DAC with ruby manometers
    • 观察: sample loaded into magneto-cryostat
  • Ultrafast Pump-Probe Spectroscopy — CDW critical slowing down collapses under pressure; at higher pressures, relaxation indicates incipient superconducting correlations.
    • 材料: Pr4Ni3O10 in DAC
    • 方法: optical pump-probe reflectivity; 0.8 eV pump, 1.6 eV probe
    • 观察: ∆R/R dynamics; critical slowing down near CDW transition; prolonged relaxation at high pressure and low temperature
  • Data Analysis and Modeling — The absence of magnetic-field-dependent dynamics suggests non-bulk superconductivity.
    • 材料: Pr4Ni3O10
    • 方法: exponential fitting; Rothwarf-Taylor model; CDW gap extraction
    • 观察: CDW gap ∆CDW ≈ 23.9 meV at 0.3 µJ/cm2