Article
Materials Science, Multidisciplinary
B. H. Zhang, Z. Wang, R. Q. Wu
Summary: Through systematic first-principles calculations, this study investigates the spin-phonon coupling in Cd2Os2O7 and finds a potential candidate for thermal spin devices. The significant contribution of Dzyaloshinskii-Moriya interaction (DMI) to most modes is highlighted, offering valuable insights for the search of excellent spin caloritronic materials.
Article
Chemistry, Physical
Shekhar Tyagi, V. G. Sathe, Gaurav Sharma, Rajeev Rawat
Summary: In this study, epitaxial thin films of SrRuO3 with large strain disorder were grown using pulsed laser deposition on LSAT and SrTiO3 substrates. Magnetic force microscopy was used to visualize the evolution of magnetic domains across the two transitions in these films. The results showed that the magnetic anisotropy in the films was different for the two transitions, with perpendicular magnetic anisotropy dominating. Raman spectroscopy revealed a strong influence of magnetic order on the lattice, indicating a strong spin-phonon coupling.
APPLIED SURFACE SCIENCE
(2022)
Article
Physics, Applied
V. R. Sodisetti, S. Ncube, C. Coleman, R. M. Erasmus, E. Flahaut, S. Bhattacharyya
Summary: The study of spin-phonon coupling in Gd-filled double-walled carbon nanotubes revealed phonon frequency hardening at low temperatures, attributed to phonon renormalization induced by spin-phonon coupling interaction. The estimated spin-phonon coupling constants for the G(ext)(+) and G(int)(+) phonon modes were found to be 12.2 and 5.0 cm(-1) respectively, suggesting potential benefits for designing effective molecular qubits in a one-dimensional system with a three times higher spin-phonon coupling than other multiferroic compounds.
JOURNAL OF APPLIED PHYSICS
(2021)
Article
Chemistry, Physical
Xiaomin Xu, Xiaohu Wang, Pu Chang, Xiaoyu Chen, Lixiu Guan, Junguang Tao
Summary: In this work, the spin-phonon coupling effect in the two-dimensional magnetic semiconductor CrSBr is investigated using density-functional theory. It is found that the phonon vibrations are strongly influenced by the spin ordering, and the SPC constant in CrSBr is one order of magnitude larger than that in most other 2D materials. Furthermore, lattice deformation can tune the Curie temperature of the system and enhance the thermal conductivity.
JOURNAL OF PHYSICAL CHEMISTRY C
(2022)
Article
Materials Science, Multidisciplinary
M. Yarmohammadi, M. Krebs, G. S. Uhrig, B. Normand
Summary: Magnetophononics, the modulation of magnetic interactions by driving infrared-active lattice excitations, allows for ultrafast dynamical control of spin systems by light. In quantum magnets with strong spin-phonon coupling, resonances between driven phonons and spin excitations exhibit an intrinsic self-blocking effect, resulting in only a fraction of the laser power being absorbed by the phonons.
Article
Multidisciplinary Sciences
Run Zhao, Chao Yang, Hongguang Wang, Kai Jiang, Hua Wu, Shipeng Shen, Le Wang, Young Sun, Kuijuan Jin, Ju Gao, Li Chen, Haiyan Wang, Judith L. MacManus-Driscoll, Peter A. van Aken, Jiawang Hong, Weiwei Li, Hao Yang
Summary: In this study, the authors demonstrate an emergent multiferroism with magnetodielectric coupling in EuTiO3 created by a negative pressure control of strong spin-phonon coupling.
NATURE COMMUNICATIONS
(2022)
Article
Physics, Multidisciplinary
Mohd Alam, Arkadeb Pal, Khyati Anand, Surajit Ghosh, Saurabh Tripathi, Ranjan K. Singh, A. K. Ghosh, H. D. Yang, Sandip Chatterjee
Summary: The temperature-dependent Raman spectroscopy and dielectric property of pyrochlore Eu2Ti2O7 were investigated. The presence of additional phonon modes below 200 K suggests a local structural change. The anomalous softening of the phonon modes and the crystal-field-induced short-range magnetic ordering below 150 K unveil a possible spin-phonon coupling.
Article
Chemistry, Physical
Luca Tomarchio, Lorenzo Mosesso, Salvatore Macis, Loi T. Nguyen, Antonio Grilli, Martina Romani, Mariangela Cestelli Guidi, Robert J. Cava, Stefano Lupi
Summary: We report the far-infrared, temperature-dependent optical properties of a CrI3 single crystal, which is a van der Waals ferromagnet with a Curie temperature of 61 K. In addition to the expected phonon modes determined by the crystalline symmetry, the optical reflectance and transmittance spectra of CrI3 single crystals show many other excitations as a result of strong lattice anharmonicity and spin-phonon coupling. This complex vibrational spectrum highlights the entangled interactions among different degrees of freedom in CrI3.
Article
Chemistry, Physical
Xiaoze Liu, Jun Yi, Sui Yang, Erh-Chen Lin, Yue-Jiao Zhang, Peiyao Zhang, Jian-Feng Li, Yuan Wang, Yi-Hsien Lee, Zhong-Qun Tian, Xiang Zhang
Summary: Nonlinear phonon scattering in monolayer MoS2 strongly coupled to a plasmonic cavity mode has been demonstrated, showing enhanced valley polarization and sustained coherence in the stimulated regime. This suggests the potential of valley-cavity-based systems for various applications in cavity quantum electrodynamics.
Article
Chemistry, Multidisciplinary
Jiangbin Wu, Yu Yao, Miao-Ling Lin, Malte Rosner, Zhonghao Du, Kenji Watanabe, Takashi Taniguchi, Ping-Heng Tan, Stephan Haas, Han Wang
Summary: In this work, the spin-phonon coupling (SPC) in monolayer chromium tribromide is investigated using Raman spectroscopy and first principle calculations. The experimental and numerical results show good agreement in terms of Curie temperature and phonon shifts. It is demonstrated how magnetic exchange interactions affect phonon vibrations, providing design fundamentals for 2D magnetic materials and related devices.
ADVANCED MATERIALS
(2022)
Article
Chemistry, Multidisciplinary
Martin Testa-Anta, Julia N. Majcherkiewicz, Kai Xu, Alejandro R. Goni, Veronica Salgueirino
Summary: In this study, nanocrystals of antiferromagnetic Cr2O3 are shown to exhibit peculiar lattice dynamics and exceptionally strong spin-phonon coupling via Raman spectroscopy. The coupling strength is governed by the competing antiferromagnetic and ferromagnetic interactions, and changes in the surface spin configuration also play a crucial role. Overall, this work demonstrates the size dependence of the interplay between crystalline and magnetic structures in 3D antiferromagnets and offers a route for spin-phonon coupling engineering at the nanoscale. Moreover, it shows the possibility of coupling phononic excitations with magnetization dynamics at room temperature, providing a highly prospective nanomaterial for novel magnonic device design.
ADVANCED FUNCTIONAL MATERIALS
(2023)
Article
Chemistry, Physical
Bommareddy Poojitha, Aswin Shaji, Shalini Badola, Surajit Saha
Summary: Coupling of material properties in spinel structures, such as CoMn2O4, provides new possibilities for multifunctional devices. This study investigates the structural, magnetic, and vibrational properties of CoMn2O4 and reveals interesting phenomena related to spin-phonon coupling.
JOURNAL OF CHEMICAL PHYSICS
(2022)
Article
Chemistry, Physical
Ranjana R. Das, R. Neenu Lekshmi, P. N. Santhosh
Summary: The study reports strong spin-phonon coupling and a large dielectric constant in SrLaCo0.5Mn0.5O4 compound.
JOURNAL OF ALLOYS AND COMPOUNDS
(2021)
Article
Physics, Multidisciplinary
Akiho Sumiyoshiya, Tetsuya Takimoto
Summary: We study the symmetry of superconductivity around the All-In-All-Out (AIAO) spin ordered phase in a nearly halffilled pyrochlore electronic system. Through calculations of spin-cluster susceptibilities and superconducting transitions mediated by spin fluctuations, we find the emergence of spin-triplet superconductivity near the AIAO spin ordered phase.
JOURNAL OF THE PHYSICAL SOCIETY OF JAPAN
(2023)
Article
Chemistry, Multidisciplinary
Zhenwei Ou, Bin Peng, Weibin Chu, Zhe Li, Cheng Wang, Yan Zeng, Hongyi Chen, Qiuyu Wang, Guohua Dong, Yongyi Wu, Ruibin Qiu, Li Ma, Lili Zhang, Xiaoze Liu, Tao Li, Ting Yu, Zhongqiang Hu, Ti Wang, Ming Liu, Hongxing Xu
Summary: In this study, the carrier transport behavior mediated by the electron-phonon coupling in BiFeO3 epitaxial thin films is directly observed. Acoustic phonons generated by the inverse piezoelectric effect are coupled with photocarriers, leading to the observation of a doughnut shape carrier distribution. The results provide an effective approach to investigate the effects of electron-phonon interactions and are of great importance for designing and improving electronic devices.
Article
Materials Science, Multidisciplinary
Wonshik Kyung, Choong H. Kim, Yeong Kwan Kim, Beomyoung Kim, Chul Kim, Woobin Jung, Junyoung Kwon, Minsoo Kim, Aaron Bostwick, Jonathan D. Denlinger, Yoshiyuki Yoshida, Changyoung Kim
Summary: This study demonstrates that electric field can drive the rotation of octahedra in Sr2RuO4, and the surface electric field originates from the surface electric field, which can be tuned via the screening effect of the overlaid K layer. This work not only establishes that variation in the OR angle can be induced by an electric field, but also provides a way to control OR, which is an important step toward in situ control of the physical properties of perovskite oxides.
NPJ QUANTUM MATERIALS
(2021)
Article
Crystallography
Hyoung-Taek Lee, Gang-Seon Ji, Jun-Yung Oh, Choong-Won Seo, Byeong-Won Kang, Kyung-Wan Kim, Hyeong-Ryeol Park
Summary: In this study, the optical constants of a superconducting GdBa2Cu3O7-x (GdBCO) thin film in the terahertz region were quantitatively determined using terahertz time-domain spectroscopy, and the resulting refractive indices were consistent with theoretical results using the two-fluid model. This research contributes to a better understanding of the terahertz optical properties of superconducting thin films and provides a standard platform for characterizing thin films' optical properties without the need for Kramers-Kronig transformation at terahertz frequencies.
Article
Physics, Multidisciplinary
Thi Huyen Nguyen, Jaeseok Son, Soyeun Kim, Hwanbeom Cho, Choong H. Kim, Y. P. Wang, Kenneth S. Burch, In-Sang Yang, Jaehong Jeong, Je-Geun Park, S. J. Moon, T. W. Noh
Summary: Topological magnonic materials have potential for dissipationless spintronic applications, with pyrochlore iridates considered good candidates for designing topological magnon bands. Through Raman spectroscopy on Y2Ir2O7, it was confirmed that the material hosts a distinct nontrivial magnon band topology, demonstrating the potential for tailored magnon band topology in pyrochlore iridates.
PHYSICAL REVIEW LETTERS
(2021)
Article
Multidisciplinary Sciences
Byungmin Sohn, Jeong Rae Kim, Choong H. Kim, Sangmin Lee, Sungsoo Hahn, Younsik Kim, Soonsang Huh, Donghan Kim, Youngdo Kim, Wonshik Kyung, Minsoo Kim, Miyoung Kim, Tae Won Noh, Changyoung Kim
Summary: While transition metal oxides typically become insulators in the single-atomic-layer limit, a correlated metallic state has been found in a single-atomic layer of epitaxial SrRuO3, demonstrating tunability in the electronic phase of single-atomic-layer oxides and the potential for rich phases in two-dimensional correlated electron systems.
NATURE COMMUNICATIONS
(2021)
Article
Multidisciplinary Sciences
Junhyeon Jo, Jung Hwa Kim, Choong H. Kim, Jaebyeong Lee, Daeseong Choe, Inseon Oh, Seunghyun Lee, Zonghoon Lee, Hosub Jin, Jung-Woo Yoo
Summary: This article presents a method to generate layer-by-layer defect gradients in a van der Waals material, inducing the Rashba effect by breaking spatial inversion symmetry. The effectiveness of the method is verified through experiments and theoretical calculations, paving the way for functional defect engineering in electronic applications.
NATURE COMMUNICATIONS
(2022)
Article
Materials Science, Multidisciplinary
Minsoo Kim, Junyoung Kwon, Choong H. Kim, Younsik Kim, Daun Chung, Hanyoung Ryu, Jongkeun Jung, Beom Seo Kim, Dongjoon Song, Jonathan D. Denlinger, Moonsup Han, Yoshiyuki Yoshida, Takashi Mizokawa, Wonshik Kyung, Changyoung Kim
Summary: The study observes the occurrence of KH in 4d perovskite oxide Ca2-xSrxRuO4 and finds a spectral weight transfer resembling the orbital-selective Mott phase. This study expands the application of Kondo physics to 4d multi-orbital systems.
NPJ QUANTUM MATERIALS
(2022)
Article
Materials Science, Multidisciplinary
Hyeong Jun Lee, Choong H. Kim, Ara Go
Summary: In this study, a systematic investigation was conducted on the interplay between van Hove singularities and Hund's metallicity, demonstrating a significant enhancement of the latter by the former. The results suggest a synergy between van Hove singularities and Hund's coupling, providing valuable insights into the amplification of correlation-induced phenomena in crystalline solids.
Article
Materials Science, Multidisciplinary
Hwanbeom Cho, Choong H. Kim, Yongmoon Lee, Kazuki Komatsu, Byeong-Gwan Cho, Deok-Yong Cho, Taehun Kim, Chaebin Kim, Younghak Kim, Tae Yeong Koo, Yukio Noda, Hiroyuki Kagi, Daniel Khomskii, Donghoon Seoung, Je-Geun Park
Summary: Researchers have discovered a unique phenomenon where CuAl2O4 exhibits a J(eff) = 1/2 state with strong electron correlation, despite the relatively small spin-orbit coupling. Through experimental studies, they found a pressure-induced structural transition from the Mott insulating J(eff) = 1/2 state to the S = 1/2 state. The study provides an example of the spin-orbit entangled J(eff) state under strong electron correlation and its pressure-induced transition.
Article
Materials Science, Multidisciplinary
Hyeong Jun Lee, Choong H. Kim, Ara Go
Article
Materials Science, Multidisciplinary
Taehun Kim, Choong H. Kim, Jaehong Jeong, Pyeongjae Park, Kisoo Park, Ki Hoon Lee, Jonathan C. Leiner, Daisuke Ishikawa, Alfred Q. R. Baron, Zenji Hiroi, Je-Geun Park
Article
Chemistry, Multidisciplinary
Jun-ichi Yamaura, Sachiko Maki, Takashi Honda, Yoshio Matsui, Alfian Noviyanto, Toshiya Otomo, Hitoshi Abe, Youichi Murakami, Naoki Ohashi
CHEMICAL COMMUNICATIONS
(2020)
Article
Materials Science, Multidisciplinary
Min-Cheol Lee, Choong H. Kim, Inho Kwak, C. W. Seo, Changhee Sohn, F. Nakamura, C. Sow, Y. Maeno, E. -A. Kim, T. W. Noh, K. W. Kim
Article
Materials Science, Multidisciplinary
Jun-ichi Yamaura, Zenji Hiroi
Article
Materials Science, Multidisciplinary
Rokyeon Kim, Bohm-Jung Yang, Choong H. Kim
