Scholarlink

<p>While atomic intercalation can effectively modify or optimize the properties of transition metal dichalcogenides (TMDs), high pressure can directly impact their structures, enrich their electronic states, and promote the discovery of intriguing phenomena. Here, the high-capacity Cu intercalated 2<i>H</i>-TaS<sub>2</sub> was investigated up to 50 GPa. A dramatic change in the <i>c</i>/<i>a</i> ratio was first observed around 6.0 GPa and was confirmed to induce a Lifshitz transition, altering the Fermi surface topology. In addition, the synergistic effect of Cu intercalation and pressure in TaS<sub>2</sub> leads to layer sliding, ultimately resulting in the phase transition of Cu<sub>0.65</sub>TaS<sub>2</sub> from 2<i>H</i> (<i>P</i>6<sub>3</sub>/<i>mmc</i>) to 2<i>H′</i> (<i>P</i>6<sub>3</sub>/<i>mmc</i>) phase at 11.9 GPa. Both 2<i>H</i>- and 2<i>H′</i>-Cu<sub>0.65</sub>TaS<sub>2</sub> maintained metallic character without superconductivity, establishing a fundamental distinction from its parent system, 2<i>H</i>-TaS<sub>2</sub>. It is unexpected that a charge density wave (CDW) phase transition, driven by the Lifshitz transition, was observed at 5.3 GPa based on temperature-dependent resistance data. Further compression enhanced the transition temperature (<i>T</i><sub>CDW</sub>) from 179 K at 5.3 GPa to 286 K (nearing room temperature) at 18.4 GPa. The combination of high-capacity intercalation and high pressure has revealed exotic phenomena that neither method alone can achieve, offering a practical way to develop new materials for different application scenarios.</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

Synergistic effect of high-capacity Cu intercalation and high pressure on structural evolution and charge density wave in 2H-TaS2

  • 期刊论文

  • 发表日期：

    2026年7月17日

查看全文
  • Jiayi Li,
  • Yiyang Zhou,
  • Ruilian Tang,
  • Fengshuo Liu,
  • Yang Gao,
  • Bin Yang,
  • Bing Li,
  • Fuyang Liu,
  • Luhong Wang,
  • Haozhe Liu,
  • Yan Li

摘要

While atomic intercalation can effectively modify or optimize the properties of transition metal dichalcogenides (TMDs), high pressure can directly impact their structures, enrich their electronic states, and promote the discovery of intriguing phenomena. Here, the high-capacity Cu intercalated 2H-TaS2 was investigated up to 50 GPa. A dramatic change in the c/a ratio was first observed around 6.0 GPa and was confirmed to induce a Lifshitz transition, altering the Fermi surface topology. In addition, the synergistic effect of Cu intercalation and pressure in TaS2 leads to layer sliding, ultimately resulting in the phase transition of Cu0.65TaS2 from 2H (P63/mmc) to 2H′ (P63/mmc) phase at 11.9 GPa. Both 2H- and 2H′-Cu0.65TaS2 maintained metallic character without superconductivity, establishing a fundamental distinction from its parent system, 2H-TaS2. It is unexpected that a charge density wave (CDW) phase transition, driven by the Lifshitz transition, was observed at 5.3 GPa based on temperature-dependent resistance data. Further compression enhanced the transition temperature (TCDW) from 179 K at 5.3 GPa to 286 K (nearing room temperature) at 18.4 GPa. The combination of high-capacity intercalation and high pressure has revealed exotic phenomena that neither method alone can achieve, offering a practical way to develop new materials for different application scenarios.