Scholarlink

<p>Geometrically frustrated lattices can display a range of correlated phenomena, ranging from spin frustration and charge order to dispersionless flat bands due to quantum interference. One particularly compelling family of such materials is the half-valence spinel Li<i>B</i><sub>2</sub>O<sub>4</sub> materials. On the <i>B</i>-site frustrated pyrochlore sublattice, the interplay of correlated metallic behavior and charge frustration leads to a superconducting state in LiTi<sub>2</sub>O<sub>4</sub> and heavy fermion behavior in LiV<sub>2</sub>O<sub>4</sub>. To date, however, LiTi<sub>2</sub>O<sub>4</sub> has primarily been understood as a conventional BCS superconductor despite a lattice structure that could host more exotic ground states. Here, we present a multimodal investigation of LiTi<sub>2</sub>O<sub>4</sub>, combining ARPES, RIXS, proximate magnetic probes, and ab-initio many-body theoretical calculations. Our data reveals a novel mobile polaronic ground state with spectroscopic signatures that underlie co-dominant electron-phonon coupling and electron-electron correlations also found in the lightly doped cuprates. The cooperation between the two interaction scales distinguishes LiTi<sub>2</sub>O<sub>4</sub> from other superconducting titanates, suggesting an unconventional origin to superconductivity in LiTi<sub>2</sub>O<sub>4</sub>. Our work deepens our understanding of the rare interplay of electron-electron correlations and electron-phonon coupling in unconventional superconducting systems. In particular, our work identifies the geometrically frustrated, mixed-valence spinel family as an under-explored platform for discovering unconventional, correlated ground states.</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

Unconventional polaronic ground state in superconducting LiTi2O4

  • 期刊论文

  • 出版模式：

    开放获取

  • 发表日期：

    2026年1月6日

查看全文
  • Zubia Hasan,
  • Grace A. Pan,
  • Harrison LaBollita,
  • Austin Kaczmarek,
  • Suk Hyun Sung,
  • Shekhar Sharma,
  • Purnima P. Balakrishnan,
  • Edward Mercer,
  • Vivek Bhartiya,
  • Alpha T. N’Diaye,
  • Zaher Salman,
  • Thomas Prokscha,
  • Andreas Suter,
  • Alexander J. Grutter,
  • Mirian Garcia-Fernandez,
  • Ke-Jin Zhou,
  • Jonathan Pelliciari,
  • Valentina Bisogni,
  • Ismail El Baggari,
  • Darrell G. Schlom,
  • Matthew R. Barone,
  • Charles M. Brooks,
  • Katja C. Nowack,
  • Antia S. Botana,
  • Brendan D. Faeth,
  • Alberto de la Torre,
  • Julia A. Mundy

摘要

Geometrically frustrated lattices can display a range of correlated phenomena, ranging from spin frustration and charge order to dispersionless flat bands due to quantum interference. One particularly compelling family of such materials is the half-valence spinel LiB2O4 materials. On the B-site frustrated pyrochlore sublattice, the interplay of correlated metallic behavior and charge frustration leads to a superconducting state in LiTi2O4 and heavy fermion behavior in LiV2O4. To date, however, LiTi2O4 has primarily been understood as a conventional BCS superconductor despite a lattice structure that could host more exotic ground states. Here, we present a multimodal investigation of LiTi2O4, combining ARPES, RIXS, proximate magnetic probes, and ab-initio many-body theoretical calculations. Our data reveals a novel mobile polaronic ground state with spectroscopic signatures that underlie co-dominant electron-phonon coupling and electron-electron correlations also found in the lightly doped cuprates. The cooperation between the two interaction scales distinguishes LiTi2O4 from other superconducting titanates, suggesting an unconventional origin to superconductivity in LiTi2O4. Our work deepens our understanding of the rare interplay of electron-electron correlations and electron-phonon coupling in unconventional superconducting systems. In particular, our work identifies the geometrically frustrated, mixed-valence spinel family as an under-explored platform for discovering unconventional, correlated ground states.