Scholarlink

<p>CeSiI is a van der Waals heavy-fermion metal featuring a long-range antiferromagnetic order and Kondo coherence. The phase diagram that details the evolutions of the transition temperatures of those two orders as a function of external tuning parameters such as pressure is crucial for understanding strong electron interactions in heavy-fermion systems. Here we experimentally demonstrate the phase diagram of CeSiI. The critical temperature of the Kondo coherent state exhibits a V-shaped, non-monotonic dependence on pressure. Upon suppression of the antiferromagnetic order, a superconducting dome emerges with a maximum transition temperature of about 240 mK and the coherence temperature reaches its minimum. The close proximity of superconductivity to antiferromagnetic instability, together with a large upper critical field, suggests an unconventional pairing mechanism in CeSiI. Normal-state transport measurements further provide evidence for quantum criticality, as manifested by non-Fermi-liquid behaviour and divergence of the effective electron mass. Our findings support CeSiI as a heavy-fermion superconductor and reveal an unconventional nature for its Kondo coherence at ambient pressure, thus offering a platform for exploring the interplay among strong electron correlations, Kondo hybridization, magnetism and unconventional superconductivity in two-dimensional heavy-fermion systems.</p>

错误：搜索内容不能为空，请输入英文关键词
错误：关键词超出字数限制，请精简
高级检索

Superconductivity under pressure in a van der Waals heavy-fermion metal

  • 期刊论文

  • 发表日期：

    2026年7月28日

查看全文
  • Tong Shi,
  • Wenhao Li,
  • Qingxin Dong,
  • Pengtao Yang,
  • Hanming Ma,
  • Zhaoming Tian,
  • Ningning Wang,
  • Jianping Sun,
  • Yoshiya Uwatoko,
  • Yi-feng Yang,
  • Bosen Wang,
  • Hechang Lei,
  • Jinguang Cheng

摘要

CeSiI is a van der Waals heavy-fermion metal featuring a long-range antiferromagnetic order and Kondo coherence. The phase diagram that details the evolutions of the transition temperatures of those two orders as a function of external tuning parameters such as pressure is crucial for understanding strong electron interactions in heavy-fermion systems. Here we experimentally demonstrate the phase diagram of CeSiI. The critical temperature of the Kondo coherent state exhibits a V-shaped, non-monotonic dependence on pressure. Upon suppression of the antiferromagnetic order, a superconducting dome emerges with a maximum transition temperature of about 240 mK and the coherence temperature reaches its minimum. The close proximity of superconductivity to antiferromagnetic instability, together with a large upper critical field, suggests an unconventional pairing mechanism in CeSiI. Normal-state transport measurements further provide evidence for quantum criticality, as manifested by non-Fermi-liquid behaviour and divergence of the effective electron mass. Our findings support CeSiI as a heavy-fermion superconductor and reveal an unconventional nature for its Kondo coherence at ambient pressure, thus offering a platform for exploring the interplay among strong electron correlations, Kondo hybridization, magnetism and unconventional superconductivity in two-dimensional heavy-fermion systems.