Charge Order Driven by Nonlocal Coulomb Interactions in La<sub>3</sub>Ni<sub>2</sub>O<sub>7</sub> DOI Open Access

DU Zhengzhong,

Jie Li, Lü Yi

и другие.

Acta Physica Sinica, Год журнала: 2025, Номер 74(15), С. 0 - 0

Опубликована: Янв. 1, 2025

The bilayer nickelate La<sub>3</sub>Ni<sub>2</sub>O<sub>7</sub>, a member of the Ruddlesden–Popper series, has recently garnered significant attention due to its superconductivity under high pressure (above 14 GPa) with transition temperature approximately 80 K<sup> [1]</sup>. Its unique structure results in an electronic configuration significantly distinct from those observed cuprates and infinite-layer nickelates. Consequently, understanding correlated superconducting mechanism emerged as topic major scientific importance. Recent experimental observations have further identified coexistence charge spin density wave orders suggesting complex interplay among various competing phases superconductivity.<br>In this work, we investigate order La<sub>3</sub>Ni<sub>2</sub>O<sub>7</sub> using low-energy effective model that explicitly includes Ni-<i>e</i><sub><i>g</i></sub> orbitals. By employing combined functional theory dynamical mean-field (DFT+DMFT) framework, systematically explore impact nearest-neighbor Coulomb interaction <i>V</i> on ordering correlation effects, nonlocal interactions treated at Hartree approximation level. Our computational methodology features newly developed tensor-network impurity solver utilizing natural-orbital basis complex-time evolution, facilitating effcient precise evaluations Green’s function real-frequency axis.<br>Our analysis reveals for strengths below critical value (<i>V</i> ≤ <i>V</i><sub><i>c</i>1</sub> ≈ 0.46 eV), system maintains sublattice symmetry, resulting minimal changes spectral function. Several high-energy fine structures within Hubbard bands correspond remnants atomic multiplet excitations, allowing extraction parameters. When > <i>V</i><sub><i>c</i>1</sub>, symmetry breaks, transitions into charge-ordered state. Spectral evolve increasing order, providing clear benchmark quantitatively assess degree disproportionation against data. quasiparticle weight Z exhibits nonmonotonic behavior , reaching minimum near 0.60 eV more populated it approaches half-filling. Upon beyond <i>V</i><sub><i>c</i>2</sub> 0.63 eV, becomes fully polarized, characterized by one becoming nearly empty other approaching three-quarter filling.<br>These findings underscore role driving tuning correlations, thereby offering fresh insights phenomena

Язык: Английский

Transition from s± -wave to dx2−y2 -wave superconductivity driven by interlayer interaction in the bilayer two-orbital … DOI

Wen-Han 文翰 Xi 西,

Shun-Li Yu,

Jian‐Xin Li

и другие.

Physical review. B./Physical review. B, Год журнала: 2025, Номер 111(10)

Опубликована: Март 17, 2025

Процитировано

0
Low-temperature mean valence of nickel ions in pressurized La3Ni2O7 DOI
S. Cai, Yazhou Zhou,

Hualei Sun

и другие.

Physical review. B./Physical review. B, Год журнала: 2025, Номер 111(10)

Опубликована: Март 24, 2025

The discovery of high critical temperature (${T}_{c}$) superconductivity in pressurized ${\mathrm{La}}_{3}{\mathrm{Ni}}_{2}{\mathrm{O}}_{7}$ has ignited renewed excitement the search for novel high-${T}_{c}$ superconducting compounds with $3d$ transition metals. Compared to other ambient- pressure superconductors, such as copper-oxide and iron-oxypnictides, unraveling mechanisms pressure-induced poses significant unique challenges. A factor this phenomenon seems be related electronic configuration orbitals, which may play a fundamental role driving superconductivity. However, effects on mixed-valence states $3d$-orbital cations their influence emergence remain poorly understood. Here, we use high-pressure ($P$) low-temperature synchrotron x-ray absorption spectroscopy investigate mean valence (\ensuremath{\nu}) change Ni ions ${\mathrm{La}}_{3}{\mathrm{Ni}}_{2}{\mathrm{O}}_{7}$. Our results demonstrate that at low 20 K, \ensuremath{\nu} remains relatively stable across pressures range from 1 atm 40 GPa. Based analyzing data, find pressure, ambient-pressure ordered phases disappear both structural phase occur. revealed by our is consistent determined diffraction, offering information comprehensive understanding

Язык: Английский

Процитировано

0
Spin-density wave and superconductivity in La4Ni3O10 under ambient pressure DOI
Ming Zhang, Hongyi Sun, Yubo Liu

и другие.

Physical review. B./Physical review. B, Год журнала: 2025, Номер 111(14)

Опубликована: Апрель 2, 2025

Процитировано

0
Out-of-plane bond-order phase, superconductivity, and their competition in the t - J∥−J⊥ model: Possible implications for bilayer nickelates DOI
Matías Bejas, Xianxin Wu, Debmalya Chakraborty

и другие.

Physical review. B./Physical review. B, Год журнала: 2025, Номер 111(14)

Опубликована: Апрель 28, 2025

Язык: Английский

Процитировано

0
Spin-charge-orbital order in nickelate superconductors DOI

Binhua Zhang,

Changsong Xu, Hongjun Xiang

и другие.

Physical review. B./Physical review. B, Год журнала: 2025, Номер 111(18)

Опубликована: Май 1, 2025

Язык: Английский

Процитировано

0
Orbital selectivity in electronic correlations and spin instabilities in La3Ni2O7 DOI
Min Liu, X.H. Shao

Physical review. B./Physical review. B, Год журнала: 2025, Номер 111(19)

Опубликована: Май 8, 2025

Процитировано

0
Numerical study of the bilayer two-orbital model for La3Ni2O7 on a plaquette ladder DOI
Yang Shen,

Jiale Huang,

Xiangjian Qian

и другие.

Physical review. B./Physical review. B, Год журнала: 2025, Номер 111(18)

Опубликована: Май 23, 2025

Процитировано

0
Charge Order Driven by Nonlocal Coulomb Interactions in La<sub>3</sub>Ni<sub>2</sub>O<sub>7</sub> DOI Open Access

DU Zhengzhong,

Jie Li, Lü Yi

и другие.

Acta Physica Sinica, Год журнала: 2025, Номер 74(15), С. 0 - 0

Опубликована: Янв. 1, 2025

The bilayer nickelate La<sub>3</sub>Ni<sub>2</sub>O<sub>7</sub>, a member of the Ruddlesden–Popper series, has recently garnered significant attention due to its superconductivity under high pressure (above 14 GPa) with transition temperature approximately 80 K<sup> [1]</sup>. Its unique structure results in an electronic configuration significantly distinct from those observed cuprates and infinite-layer nickelates. Consequently, understanding correlated superconducting mechanism emerged as topic major scientific importance. Recent experimental observations have further identified coexistence charge spin density wave orders suggesting complex interplay among various competing phases superconductivity.<br>In this work, we investigate order La<sub>3</sub>Ni<sub>2</sub>O<sub>7</sub> using low-energy effective model that explicitly includes Ni-<i>e</i><sub><i>g</i></sub> orbitals. By employing combined functional theory dynamical mean-field (DFT+DMFT) framework, systematically explore impact nearest-neighbor Coulomb interaction <i>V</i> on ordering correlation effects, nonlocal interactions treated at Hartree approximation level. Our computational methodology features newly developed tensor-network impurity solver utilizing natural-orbital basis complex-time evolution, facilitating effcient precise evaluations Green’s function real-frequency axis.<br>Our analysis reveals for strengths below critical value (<i>V</i> ≤ <i>V</i><sub><i>c</i>1</sub> ≈ 0.46 eV), system maintains sublattice symmetry, resulting minimal changes spectral function. Several high-energy fine structures within Hubbard bands correspond remnants atomic multiplet excitations, allowing extraction parameters. When > <i>V</i><sub><i>c</i>1</sub>, symmetry breaks, transitions into charge-ordered state. Spectral evolve increasing order, providing clear benchmark quantitatively assess degree disproportionation against data. quasiparticle weight Z exhibits nonmonotonic behavior , reaching minimum near 0.60 eV more populated it approaches half-filling. Upon beyond <i>V</i><sub><i>c</i>2</sub> 0.63 eV, becomes fully polarized, characterized by one becoming nearly empty other approaching three-quarter filling.<br>These findings underscore role driving tuning correlations, thereby offering fresh insights phenomena

Язык: Английский

Процитировано

0