Article
Multidisciplinary Sciences
Nikola Maksimovic, Daniel H. Eilbott, Tessa Cookmeyer, Fanghui Wan, Jan Rusz, Vikram Nagarajan, Shannon C. Haley, Eran Maniv, Amanda Gong, Stefano Faubel, Ian M. Hayes, Ali Bangura, John Singleton, Johanna C. Palmstrom, Laurel Winter, Ross McDonald, Sooyoung Jang, Ping Ai, Yi Lin, Samuel Ciocys, Jacob Gobbo, Yochai Werman, Peter M. Oppeneer, Ehud Altman, Alessandra Lanzara, James G. Analytis
Summary: This article discusses the existence of a quantum critical point in the unconventional superconductor CeCoIn5, characterized by the connection of Fermi surfaces and electron delocalization, without apparent broken symmetry. The article provides a model that interprets this transition as the fractionalization of spin and charge, effectively describing the anomalous transport behavior observed for the Hall effect.
Article
Physics, Multidisciplinary
Harim Jang, Vuong Thi Anh Hong, Jihyun Kim, Xin Lu, Tuson Park
Summary: The origin of the partial suppression of the electronic density states in the pseudogap behavior in high-Tc superconductivity has been controversial. This study investigates the quasiparticle scattering spectroscopy of the quantum critical superconductor CeCoIn5 and reveals the presence of a pseudogap with energy Ag. The results suggest that the pseudogap in CeCoIn5 is controlled by Kondo hybridization instead of being involved in the formation of superconducting Cooper pairs.
PHYSICAL REVIEW LETTERS
(2023)
Article
Materials Science, Multidisciplinary
Chuanshuai Huang, Yajun Wei, Yongchun Tao, Jun Wang
Summary: The study shows that by controlling the orientation of the exchange field, a 0-π transition can be achieved in graphene-based superconductor-ferromagnet-R-superconductor structures, while varying the RSOC strength λ does not directly affect this transition, but it is a necessary condition for the transition induced by changing the orientation.
Article
Physics, Multidisciplinary
V. R. Shaginyan, A. Z. Msezane, M. V. Zverev, Y. S. Leevik
Summary: The condensed-matter community is engaged in a heated debate over the nature of quantum critical points (QCP) governing the low-temperature properties of heavy fermion metals. Experimental observations, including smeared jump-like behavior in residual resistivity ρ0 and Hall resistivity RH, violation of time invariance symmetry T and charge invariance C, and violation of quasiparticle-hole symmetry, provide important clues on the origin of both the non-Fermi-liquid behavior and QCP. Based on significant experimental data for the first time, it is shown that these observations unambiguously point to the symmetry violation accompanying the QCP of CeCoIn5, and that QCP itself is represented by the topological fermion-condensation quantum phase transition (FCQPT) connecting two Fermi surfaces with different topological charges.
Article
Materials Science, Multidisciplinary
L. Peng, M. Naritsuka, S. Akutagawa, S. Suetsugu, M. Haze, Y. Kasahara, T. Terashima, R. Peters, Y. Matsuda, T. Asaba
Summary: We used in situ scanning tunneling microscopy to study atomically thin films of CeCoIn5 and found evidence of superconductivity mediated by purely two-dimensional bosonic excitations in even monolayer CeCoIn5. The critical temperature of these thin films is suppressed compared to the bulk material, but similar to superlattices with CeCoIn5 layers of the same thickness. The out-of-plane upper critical field at zero temperature is significantly enhanced in the thin films, suggesting the emergence of unusual superconductivity with parity mixing caused by inversion symmetry breaking.
Article
Physics, Condensed Matter
Y. Takagaki
Summary: The study focuses on the magnetotransport properties of graphene nanoribbons in contact with superconductors, showing that nearly perfect Andreev reflection results in significant increases in the period of oscillations induced by cyclotron motion. Additionally, chaotic fluctuations are observed in the regime of Hofstadter's butterfly, with transmission modulation periodicity changing continuously over eight orders of magnitude of magnetic-field variation. Commensurability and edge-state oscillations are also examined in situations with specular Andreev reflection.
JOURNAL OF PHYSICS-CONDENSED MATTER
(2022)
Article
Chemistry, Physical
Jian-Xiang Qiu, Christian Tzschaschel, Junyeong Ahn, Anyuan Gao, Houchen Li, Xin-Yue Zhang, Barun Ghosh, Chaowei Hu, Yu-Xuan Wang, Yu-Fei Liu, Damien Berube, Thao Dinh, Zhenhao Gong, Shang-Wei Lien, Sheng-Chin Ho, Bahadur Singh, Kenji Watanabe, Takashi Taniguchi, David C. Bell, Hai-Zhou Lu, Arun Bansil, Hsin Lin, Tay-Rong Chang, Brian B. Zhou, Qiong Ma, Ashvin Vishwanath, Ni Ni, Su-Yang Xu
Summary: Using circularly polarized light, researchers have observed helicity-dependent optical control of fully compensated antiferromagnetic order in a topological axion insulator called MnBi2Te4. This optical control and circular dichroism are based on the optical axion electrodynamics and can potentially be used to control PT-symmetric antiferromagnets and create dissipationless circuits using topological edge states.
Article
Physics, Condensed Matter
Lichang Yin, Liqiang Che, Tian Le, Ye Chen, Yongjun Zhang, Hanoh Lee, Daniel Gnida, Joe D. Thompson, Dariusz Kaczorowski, Xin Lu
Summary: The study systematically investigates the hybridization between f and conduction electrons in heavy fermion compounds CeCoIn5, Ce2PdIn8, and Ce3PdIn11 through point-contact spectroscopy measurements. The results show an evolving Fano-like conductance shape below temperature T* in each compound, indicating the development of hybridization between local f and itinerant conduction electrons in the coherent heavy fermion state. A quantitative analysis using a two-channel model compares the tunneling process between normal metallic silver particles in a soft point-contact and heavy-fermion single crystals CeCoIn5, Ce2PdIn8, and Ce3PdIn11.
JOURNAL OF PHYSICS-CONDENSED MATTER
(2021)
Article
Materials Science, Multidisciplinary
Myounghoon Lee, Yu-Seong Seo, Seulki Roh, Seokbae Lee, Jihyun Kim, Junwon Kim, Tuson Park, Ji Hoon Shim, Jungseek Hwang
Summary: We investigated the electronic evolution of CeCoIn5 using infrared spectroscopy and compared it with LaCoIn5, which has no f electrons. The differences caused by the f electrons were observed to be more obvious in low-energy optical spectra at low temperatures. By introducing a complex optical resistivity, a magnetic optical resistivity was obtained from the difference in resistivity spectra of the two systems. The onset temperature of the Kondo effect in CeCoIn5 was found to be much higher than the known onset temperature of Kondo scattering, suggesting the presence of hybridization gaps.
RESULTS IN PHYSICS
(2023)
Article
Materials Science, Multidisciplinary
Sophia Simon, Max Geier, Piet W. Brouwer
Summary: Using the relationship between topological gapless phases in three dimensions and topological gapped phases in two dimensions, this study identifies four types of higher-order topological semimetals or nodal superconductors (HOTS), each exhibiting different characteristics at crystal hinges, with their properties corresponding to the bulk topology.
Article
Materials Science, Multidisciplinary
Yinan Fang, Seungju Han, Stefano Chesi, Mahn -Soo Choi
Summary: We study subgap modes in two-dimensional superconductor/ferromagnet/superconductor junctions and find that these modes exhibit characteristics similar to Yu-Shiba-Rusinov states. The dispersion relation of the subgap modes shows different profiles depending on the transport state of the ferromagnet. Increasing spin splitting in the ferromagnet leads to a 0-pi transition in the Josephson current across the junction, with the Josephson current density strongly dependent on the momentum along the junction interface. Clean superconductor-ferromagnet interfaces allow for engineering the wave functions of the subgap modes along an inhomogeneous magnetic junction.
Article
Materials Science, Multidisciplinary
S. J. Carreira, D. Sanchez-Manzano, M. -W. Yoo, K. Seurre, V. Rouco, A. Sander, J. Santamaria, A. Anane, J. E. Villegas
Summary: In this study, spin-pumping effects in bilayers of a soft metallic ferromagnet and high-temperature superconductor YBCO were investigated using wideband ferromagnetic resonance. The Gilbert damping in the ferromagnet dropped drastically across the normal-superconducting transition, with different behaviors observed depending on the interface morphology. The unique behavior was attributed to the quasiparticle density of states at the YBCO surface and the zero-gap nodes in the momentum space.
Article
Materials Science, Multidisciplinary
K. Shrestha, S. Zhang, L. H. Greene, Y. Lai, R. E. Baumbach, K. Sasmal, M. B. Maple, W. K. Park
Summary: In CeCoIn5, the local f-electron moments are directly involved in the pairing process, resulting in the emergence of a pairing gap and a field-induced gaplike feature that increases linearly with magnetic field.
Article
Multidisciplinary Sciences
Victor G. Yarzhemsky, Egor A. Teplyakov
Summary: The superconducting order parameter (SOP) of triplet superconductor UTe2 was constructed using the topological space group approach, which differs from phenomenological and topological approaches by treating single pair function and phase winding in condensate as separate quantities. By studying the connection for the D2h point group and m & PRIME; m & PRIME; m magnetic group, it was demonstrated how a non-unitary pair function of UTe2 can be constructed using one-dimensional real irreducible representations and Ginzburg-Landau phase winding. Experimental data on the superconducting order parameter of topological superconductors UPt3, Sr2RuO4, LaPt3P, and UTe2 were examined, and the peculiarities of their nodal structures were found to be connected to the theoretical results of the topological space group approach.
Article
Materials Science, Multidisciplinary
Yuhi Takabatake, Shu-Ichiro Suzuki, Yukio Tanaka
Summary: In this study, the tunneling conductance of the (d+ip)-wave superconductor on the (110) surface of a high-Tc cuprate superconductor is theoretically investigated. The results show that the zero-bias peak of the d-wave superconductor is robust against the spin-triplet p-wave surface subdominant order. Comparing numerical and experimental results indicates the feasibility of spin-triplet p-wave surface subdominant order.