On the cuprates' universal waterfall feature: evidence of a momentum-driven crossover

Autor: Bacq-Labreuil, Benjamin, Fawaz, Chafic, Okazaki, Yuichi, Obata, Yukiko, Cercellier, Hervé, Lefevre, Patrick, Bertran, François, Santos-Cottin, David, Yamamoto, Hajime, Yamada, Ikuya, Azuma, Masaki, Horiba, Koji, Kumigashira, Hiroshi, d'Astuto, Matteo, Biermann, Silke, Lenz, Benjamin

We study two related universal anomalies of the spectral function of cuprates, so called waterfall and high-energy kink features, by a combined cellular dynamical mean-field theory and angle-resolved photoemission study for the oxychloride Na$_x$Ca$_

Externí odkaz: http://arxiv.org/abs/2312.14381

Paramagnon dispersion and damping in doped Na$_{x}$Ca$_{2-x}$CuO$_2$Cl$_2$

Autor: Lebert, Blair W., Bacq-Labreuil, Benjamin, Dean, Mark P. M., Ruotsalainen, Kari, Nicolaou, Alessandro, Huotari, Simo, Yamada, Ikuya, Yamamoto, Hajime, Azuma, Masaki, Brookes, Nicholas B., Yakhou, Flora, Miao, Hu, Santos-Cottin, David, Lenz, Benjamin, Biermann, Silke, d'Astuto, Matteo

Publikováno v: Phys. Rev. B 108, 024506 (2023)

Using Resonant Inelastic X-ray Scattering, we measure the paramagnon dispersion and damping of undoped, antiferromagnetic Ca$_2$CuO$_2$Cl$_2$ as well as doped, superconducting Na$_{x}$Ca$_{2-x}$CuO$_2$Cl$_2$. Our estimation of the spin-exchange param

Externí odkaz: http://arxiv.org/abs/2303.04139

Integrating abnormal thermal expansion and ultralow thermal conductivity into (Cd,Ni)2Re2O7 via synergy of local structure distortion and soft acoustic phonons

Autor: Qin, Feiyu, Hu, Lei, Zhu, Yingcai, Sakai, Yuki, Kawaguchi, Shogo, Machida, Akihiko, Watanuki, Tetsu, Fang, Yue-Wen, Sun, Jun, Ding, Xiangdong, Azuma, Masaki

Publikováno v: In Acta Materialia 1 January 2024 264

Phonon anomalies with doping in superconducting oxychlorides Ca2-xCuO2Cl2

Autor: Lebert, Blair W., Yamamoto, Hajime, Azuma, Masaki, Heid, Rolf, Tsutsui, Satoshi, Uchiyama, Hiroshi, Baron, Alfred Q. R., Baptiste, Benoît, d'Astuto, Matteo

Publikováno v: Phys. Rev. B 101, 020506 (2020)

We measure the dispersion of the Cu-O bond-stretching phonon mode in the high-temperature superconducting parent compound Ca$_2$CuO$_2$Cl$_2$. Our density functional theory calculations predict a cosine-shaped bending of the dispersion along both the

Externí odkaz: http://arxiv.org/abs/1904.08258

Giant Negative Thermal Expansion Induced by the Synergistic Effects of Ferroelectrostriction and Spin-Crossover in PbTiO3-Based Perovskites

Autor: Pan, Zhao, Chen, Jun, Yu, Runze, Patra, Lokanath, Ravindran, Ponniah, Sanson, Andrea, Milazzo, Ruggero, Carnera, Alberto, Hu, Lei, Yamamoto, Hajime, Ren, Yang, Huang, Qingzhen, Sakai, Yuki, Nishikubo, Takumi, Ogata, Takahiro, Fan, Xian, Li, Yawei, Li, Guangqiang, Hojo, Hajime, Azuma, Masaki, Xing, Xianran

Publikováno v: Giant Negative Thermal Expansion Induced by the Synergistic Effects of Ferroelectrostriction and Spin-Crossover in PbTiO3-Based Perovskites. Chemistry of Materials. (2019)

The discovery of unusual negative thermal expansion (NTE) provides the opportunity to control the common but much desired property of thermal expansion, which is valuable not only in scientific interests but also in practical applications. However, m

Externí odkaz: http://arxiv.org/abs/1902.04757