Article
Materials Science, Multidisciplinary
Urban Vernik, Alexey M. Lomonosov, Vladimir S. Vlasov, Leonid N. Kotov, Dmitry A. Kuzmin, Igor V. Bychkov, Paolo Vavassori, Vasily V. Temnov
Summary: We analyze resonant magnetoelastic interactions between standing perpendicular spin wave modes and longitudinal acoustic phonon modes in metal-ferromagnet bilayer and trilayer structures. By controlling the frequencies and eigenmodes of acoustic vibrations, we achieve and tune the spectral and spatial mode overlap between phonons and magnons, resulting in strong resonant interaction.
Article
Chemistry, Multidisciplinary
Hiroaki Ishizuka, Ali Fahimniya, Francisco Guinea, Leonid Levitov
Summary: The study discusses the control of electron-phonon scattering strength by altering the size of electronic Wannier orbitals to achieve an enhancement effect similar to the Purcell effect, and the specific manifestations of this phenomenon in graphene moire superlattices.
Article
Chemistry, Physical
Shouhang Li, Zhen Tong, Cheng Shao, Hua Bao, Thomas Frauenheim, Xiangjun Liu
Summary: The electrical transport properties of hexagonal close-packed noble metals are almost isotropic due to the complementary contributions of different bands. These metals have weak electron-phonon interactions, resulting in small electron-phonon scattering rates, which is beneficial for electron and thermal transport. This suggests that hexagonal close-packed noble metals have great potential in electronics and solar cells.
JOURNAL OF PHYSICAL CHEMISTRY LETTERS
(2022)
Article
Chemistry, Physical
Gui-Cang He, Li-Na Shi, Yi-Lei Hua, Xiao-Li Zhu
Summary: This work investigates the electron-phonon, phonon-phonon, and phonon structure scattering mechanisms and their impact on the thermal and thermoelectric properties of a silver nanowire (AgNW). The study reveals that the electron-phonon scattering rate decreases with increasing temperature, while the phonon-phonon scattering rate increases and surpasses the electron-phonon scattering rate above the Debye temperature. The rate of phonon structure scattering remains constant. The thermal conductivity of the AgNW exhibits an opposite trend to the total phonon scattering rate with temperature. The thermoelectric properties of the AgNW are heavily influenced by the thermal conductivity, and the figure of merit (ZT) of the AgNW is found to be significantly higher than that of bulk silver at room temperature.
PHYSICAL CHEMISTRY CHEMICAL PHYSICS
(2022)
Article
Materials Science, Multidisciplinary
Fatih Denbri, Nabil Mahamdioua, Faiza Meriche, Nevin Soylu Koc, Cabir Terzioglu, Ahmet Varilci, Sevgi Polat Altintas
Summary: The study investigated the structural, microstructural, and magneto-transport properties of polycrystalline La0.5Sm0.2Ca0.3-x PbxMnO3 samples, revealing the significant impact of Pb doping on their resistivity and magnetoresistance properties. Additionally, it was found that the lattice parameters of the samples increase with higher Pb content.
MATERIALS CHEMISTRY AND PHYSICS
(2021)
Article
Chemistry, Multidisciplinary
Mathieu Mirjolet, Francisco Rivadulla, Premysl Marsik, Vladislav Borisov, Roser Valenti, Josep Fontcuberta
Summary: The article discusses the physics of strongly correlated electronic systems in transition metal oxides, using SrVO3 as an example to illustrate the limitations of electron-electron correlations in a Fermi liquid.
Article
Materials Science, Multidisciplinary
Tatsuhiro Ishida, Daiki Ootsuki, Shigeyuki Ishida, Miho Kitamura, Koji Horiba, Yasumasa Takagi, Akira Yasui, Eiji Ikenaga, Kenji Kawashima, Yousuke Yanagi, Akira Iyo, Hiroshi Eisaki, Teppei Yoshida
Summary: We investigated the electronic structure of BaIr2Ge7 with two types of cage structure using angle-resolved photoemission spectroscopy and hard x-ray photoemission spectroscopy. The observed Fermi surfaces originate from the hybridization of Ir 5d and Ge 4p orbitals and show C2 symmetry, reflecting the crystal structure of BaIr2Ge7. The temperature dependence of the spectra suggests the presence of weak anharmonic phonon modes in BaIr2Ge7.
Article
Chemistry, Inorganic & Nuclear
Tudor-Gabriel Mocioi, Antonia Ghita, Vasily V. V. Temnov
Summary: Using valid experimental parameters, this study quantifies the magnitude of resonantly phonon-driven precession of exchange magnons in freestanding ferromagnetic nickel thin films on their thickness L. Analytical solutions reveal a nonmonotonous dependence of the peak magnetization precession on the film thickness, attributed to different dependencies of multiple prefactors involved in the expression for the total magnetization dynamics. The magnetization precession can be amplified by a Q-factor of either the phonon or the magnon resonance, depending on the ratio of acoustic and magnetic damping constants.
Article
Physics, Multidisciplinary
J. D. Watts, J. T. Batley, N. A. Rabideau, J. P. Hoch, L. O'Brien, P. A. Crowell, C. Leighton
Summary: The Elliott-Yafet theory of spin relaxation in nonmagnetic metals, which predicts the proportionality between spin and momentum relaxation times for scattering centers such as phonons, is tested in Al nanowires. The study reveals a significant finite-size effect on the Elliott-Yafet proportionality constant for phonon scattering, attributed to strong phonon-induced spin relaxation at surfaces and interfaces, particularly driven by enhanced spin-orbit coupling.
PHYSICAL REVIEW LETTERS
(2022)
Article
Materials Science, Multidisciplinary
K. Gurukrishna, Ashok Rao, K. Shyam Prasad, Yu-Chun Wang, Yung-Kang Kuo
Summary: To investigate the effect of cation disorders on the thermoelectric performance of the Cu3SbSe4 system, copper content in Cu3+xSbSe4 (x = -0.06, -0.04, 0, 0.04, 0.06, and 0.08) system was adjusted via solid-state reaction route. The intentional deviations from stoichiometry successfully enhanced electrical transport and reduced phonon transport simultaneously. The self-doping effect induced by non-stoichiometry provided acceptor levels, thereby increasing electrical conductivity. Modulating the Fermi level within the valence band allowed for the realization of a high power factor and considerable reduction in thermal conductivity, ultimately enhancing the figure of merit of the Cu3SbSe4 system.
MATERIALS RESEARCH BULLETIN
(2023)
Article
Chemistry, Physical
Sanja Perac, Slavica M. Savic, Zorica Brankovic, Slavko Bernik, Aleksandar Radojkovic, Sanja Kojic, Dragana Vasiljevic, Goran Brankovic
Summary: The thermoelectric and mechanical properties of NaCo2O4 ceramics were significantly affected by the synthesis procedure and Cu doping concentration. Samples prepared by the citric acid complex method showed higher thermoelectric performance and mechanical properties.
Article
Materials Science, Multidisciplinary
N. Yalini Devi, A. S. Alagar Nedunchezhian, D. Sidharth, P. Rajasekaran, M. Arivanandhan, I. Sarris, T-Y. Yang, R. Jayavel
Summary: Ag and Ag & Nb co-substituted SrTiO3 were synthesized and their structural, morphological and thermoelectric properties were investigated. XRD analysis was used to study the crystal structure and crystallinity. The morphology was analyzed using FESEM and TEM analysis. XPS analysis revealed the presence of Ag and the binding state of each element. The electrical resistivity of Ag-substituted SrTiO3 and the Seebeck coefficient of Ag & Nb co-substituted SrTiO3 were increased with Ag content, leading to improved power factor.
MATERIALS CHEMISTRY AND PHYSICS
(2023)
Article
Multidisciplinary Sciences
Ao Wu, Yujie Xia, Yiming Zhang, Lei Peng, Hezhu Shao, Yan Cen, Heyuan Zhu, Hao Zhang
Summary: This study demonstrates the significance of electron-phonon and phonon-phonon interactions in 2D lead phosphorene. It reveals the effects of symmetry breaking and strong high-order phonon-phonon interactions on the thermoelectric properties. The findings provide insights for the development of promising thermoelectric materials.
ADVANCED THEORY AND SIMULATIONS
(2023)
Article
Materials Science, Ceramics
Kamran Khan, Zahida Batool, Sumaira Manzoor, Dilshad Ahmad, Salma Aman, Dalal Alhashmialameer, Hala H. Abd El-Gawad, T. A. Taha, Muhammad Naeem Ashiq
Summary: In this study, a normal micmemulsion approach was used to synthesize SrBaZn2-xMnxFe12-2ySnyNiyO22 and carbon dots nanocomposite, while the hydrothermal method was employed for the synthesization of carbon dots. The materials were characterized by various techniques to examine their structural characteristics, architectures, and surface area. The results showed that the composite materials exhibited enhanced magnetic properties and increased electrical resistivity, making them suitable for high-density recording media and microwave devices. Additionally, the composite materials with low carbon dots content demonstrated excellent photocatalytic performance under sunlight, indicating their potential application for the removal of environmental pollutants.
CERAMICS INTERNATIONAL
(2022)
Article
Materials Science, Multidisciplinary
Xu Huang, Zhixiong Guo, Jinyang Xi
Summary: In this study, the effects of electron-phonon interactions on the lattice thermal conductivity and phonon transport in n-doped Si, diamond, and c-BN are investigated. The results show that electron-phonon interactions reduce the thermal conductivity of doped materials, and the impact is increased by higher electron concentrations and decreased by higher temperatures. The depression effect is more apparent in ultrawide bandgap diamond and c-BN compared to Si.
DIAMOND AND RELATED MATERIALS
(2022)