Article
Multidisciplinary Sciences
Weijiong Chen, Clara Neerup Breio, Freek Massee, Milan P. Allan, Cedomir Petrovic, J. C. Seamus Davis, Peter J. Hirschfeld, Brian M. Andersen, Andreas Kreisel
Summary: The authors used scanning tunneling microscopy to detect the orbital order in the superconductor CeCoIn5, which is enhanced in the superconducting state as predicted. Visualization of atomic-orbital degrees of freedom is a challenge in scanned microscopy. Sublattice-resolved superconductive QPI techniques represent a new approach for studying hidden orbital order.
NATURE COMMUNICATIONS
(2023)
Article
Multidisciplinary Sciences
Felix Kuester, Sascha Brinker, Samir Lounis, Stuart S. P. Parkin, Paolo Sessi
Summary: Controlling the interaction between local spins through a superconducting condensate can lead to the combination of magnetism with superconducting technology, opening up new possibilities for innovative quantum technologies.
NATURE COMMUNICATIONS
(2021)
Article
Physics, Multidisciplinary
Wen-Gen Zheng, Victor Baledent, Claire V. Colin, Francoise Damay, Jean-Pascal Rueff, Anne Forget, Dorothee Colson, Pascale Foury-Leylekian
Summary: The presence of antiferromagnetic stripe order in pressured BaFe2Se3 suggests that magnetic fluctuations from the stripe order may be crucial for the superconducting pairing of iron-based superconductors.
COMMUNICATIONS PHYSICS
(2022)
Article
Physics, Multidisciplinary
Mayu Kibune, Shunsaku Kitagawa, Katsuki Kinjo, Shiki Ogata, Masahiro Manago, Takanori Taniguchi, Kenji Ishida, Manuel Brando, Elena Hassinger, Helge Rosner, Christoph Geibel, Seunghyun Khim
Summary: Spatial inversion symmetry in crystal structures is closely related to the superconducting and magnetic properties of materials. In CeRh2As2, antiferromagnetic order breaks the local inversion symmetry, resulting in the activation of an odd-parity magnetic multipole. The coexistence of antiferromagnetism and superconductivity within a system is quite unusual. CeRh2As2 is a promising system to study the effects of the absence of local inversion symmetry on unconventional magnetic and superconducting states and their interaction.
PHYSICAL REVIEW LETTERS
(2022)
Article
Multidisciplinary Sciences
I. M. Hayes, D. S. Wei, T. Metz, J. Zhang, Y. S. Eo, S. Ran, S. R. Saha, J. Collini, N. P. Butch, D. F. Agterberg, A. Kapitulnik, J. Paglione
Summary: The superconductivity in UTe2 is characterized by a two-component order parameter that breaks time-reversal symmetry, as shown by observations of a nonzero polar Kerr effect and two transitions in specific heat. These findings place constraints on the symmetries of the order parameter and contribute to the discussion on the presence of topological superconductivity in UTe2.
Article
Materials Science, Multidisciplinary
Peter Zalom, Tomas Novotny
Summary: The study elaborates on the reentrant Kondo effect in quantum impurities/dots coupled to hybrid metal-semiconductor contacts, revealing its fragility in relation to a doublet-singlet quantum phase transition induced by particle-hole asymmetry. The analysis also explores the experimental feasibility of observing the reentrant Kondo effect in its superconducting realization.
Article
Chemistry, Multidisciplinary
Yue Li, Frank Barrows, Arthur R. C. McCray, Timothy Cote, David Friedman, Ralu N. S. Divan, Amanda K. Petford-Long, Charudatta Phatak
Summary: Artificial spin ices composed of coupled nanomagnets offer the possibility to create designer geometrical frustration and manipulate inter-nanomagnet interactions. In this study, a dimer kagome artificial spin ice system was created and the antiferromagnetic order was controlled by tuning lattice geometry. Monte Carlo simulations were used to analyze the behavior of the system and different antiferromagnetic phases and interactions were visualized in demagnetized lattices with different lattice parameters.
CELL REPORTS PHYSICAL SCIENCE
(2022)
Article
Materials Science, Multidisciplinary
Gao-Wei Qiu, Yi Zhou
Summary: Under the influence of a magnetic field, two weakly linked superconducting ultrathin films exhibit different superconducting states, with one characterized by staggered supercurrent loops and a superfluid density wave, and the other by uniform superfluid density. The phase transition between these two states falls within a specific universality class.
Article
Materials Science, Multidisciplinary
Martin Zonda, Peter Zalom, Tomas Novotny, Georgios Loukeris, Jakob Baetge, Vladislav Pokorny
Summary: We present an exactly solvable effective model of a double quantum dot coupled to superconducting leads. This model provides quantitatively correct predictions for quantum phase transitions, bound states, and Josephson supercurrents. It allows fast and reliable parameter scans, and can identify previously unnoticed phase diagram regimes.
Article
Chemistry, Multidisciplinary
Meng Hao, Chuan Xu, Cheng Wang, Zhen Liu, Su Sun, Zhibo Liu, Hui-Ming Cheng, Wencai Ren, Ning Kang
Summary: This study comprehensively investigates the electronic transport in high-quality graphene/Mo2C vertical heterostructures and observes resonance-like magnetoresistance peaks. The properties of the resonance peaks are related to the geometric resonance between electron cyclotron orbits and potential well. Additionally, the behavior of the resonance peaks and conductance fluctuation below the superconducting transition temperature indicates the correlation between quantum fluctuations and superconductivity.
Article
Chemistry, Physical
Jing Li, Peng Song, Jinpei Zhao, Kristina Vaklinova, Xiaoxu Zhao, Zejun Li, Zhizhan Qiu, Zihao Wang, Li Lin, Meng Zhao, Tun Seng Herng, Yuxin Zuo, Win Jonhson, Wei Yu, Xiao Hai, Pin Lyu, Haomin Xu, Huimin Yang, Cheng Chen, Stephen J. Pennycook, Jun Ding, Jinghua Teng, A. H. Castro Neto, Kostya S. Novoselov, Jiong Lu
Summary: A mild electrochemical exfoliation method has been developed to synthesize large-size, high crystallinity two-dimensional superconductor monolayers, enabling the fabrication of twisted van der Waals heterostructures and printed films. This method yields 2DSC monolayers with unconventional Ising pair superconductivity and enhanced upper critical field, with NbSe2 achieving a high yield of large single-crystal monolayers up to 300 μm. The resulting twisted NbSe2 vdWHs exhibit high stability, good interfacial properties, and modulation of critical current by magnetic field interaction.
Article
Physics, Multidisciplinary
Xiaoxue Liu, Naiyuan James Zhang, K. Watanabe, T. Taniguchi, J. I. A. Li
Summary: The discovery of magic-angle twisted trilayer graphene and its integration into a double-layer structure provides important insights into the properties and stability of the superconducting phase. The findings also contribute to the development of theoretical models aiming to understand the nature of superconductivity.
Article
Physics, Multidisciplinary
H. Murayama, K. Ishida, R. Kurihara, T. Ono, Y. Sato, Y. Kasahara, H. Watanabe, Y. Yanase, G. Cao, Y. Mizukami, T. Shibauchi, Y. Matsuda, S. Kasahara
Summary: Experimental observations in a spin-orbit coupled Mott insulator have unveiled a hidden-order phase with broken inversion and time-reversal symmetries, characterized by in-plane magnetic anisotropy. This odd-parity order parameter differs from previously reported even-parity nematic transitions.
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
Energy & Fuels
Sonia, Anil Kumar Dahiya
Summary: The use of Static Compensator (STATCOM) and Superconducting Magnetic Energy Storage (SMES) controller to mitigate transient stability issues in the presence of Doubly Field Induction Generator (DFIG) connected system is investigated. A novel control scheme for the DC link chopper circuit between STATCOM and SMES is proposed, showing that the system oscillations can be quickly suppressed and equilibrium state can be achieved earliest, thus improving system stability.
JOURNAL OF ENERGY STORAGE
(2021)
Article
Multidisciplinary Sciences
Vadim Grinenko, Debarchan Das, Ritu Gupta, Bastian Zinkl, Naoki Kikugawa, Yoshiteru Maeno, Clifford W. Hicks, Hans-Henning Klauss, Manfred Sigrist, Rustem Khasanov
Summary: There is considerable evidence that the superconducting state of Sr2RuO4 breaks time reversal symmetry, with experiments showing that the onset temperature of this symmetry breaking matches the critical temperature. Different order parameters are under consideration, with evidence supporting the hypothesis of a d(xz)+/- id(yz) order parameter. The distinction between symmetry-protected degeneracy and accidental degeneracy of the superconducting order parameter remains challenging in Sr2RuO4.
NATURE COMMUNICATIONS
(2021)
Article
Physics, Condensed Matter
Giorgos Livanas, Nikolaos Vanas, Manfred Sigrist, Georgios Varelogiannis
Summary: We propose a novel platform for the creation and manipulation of Majorana zero modes using a ferromagnetic metallic wire placed between conventional superconductors and ferromagnetic insulators. The controllability of the superconductor/ferromagnet heterostructures is enhanced by the interplay of applied supercurrents and exchange fields arising from the ferromagnetic insulators.
EUROPEAN PHYSICAL JOURNAL B
(2022)
Article
Physics, Multidisciplinary
E. M. Smith, O. Benton, D. R. Yahne, B. Placke, R. Schaefer, J. Gaudet, J. Dudemaine, A. Fitterman, J. Beare, A. R. Wildes, S. Bhattacharya, T. DeLazzer, C. R. C. Buhariwalla, N. P. Butch, R. Movshovich, J. D. Garrett, C. A. Marjerrison, J. P. Clancy, E. Kermarrec, G. M. Luke, A. D. Bianchi, K. A. Ross, B. D. Gaulin
Summary: The magnetic properties of Ce2Zr2O7, which has dipole-octupole character, were studied using polarized neutron diffraction and heat capacity measurements. The results suggest that Ce2Zr2O7 exhibits the characteristics of a U(1)(pi) quantum spin liquid state, with a possible boundary between dipolar and octupolar character.
Review
Physics, Condensed Matter
Mark H. Fischer, Manfred Sigrist, Daniel F. Agterberg, Youichi Yanase
Summary: Inversion and time reversal are important symmetries for the structure of Cooper pairs in superconductors. Materials lacking inversion symmetry, or noncentrosymmetric materials, exhibit unusual magnetic and magnetoelectric properties and can host topological superconductivity. Crystal structures with local inversion-symmetry breaking have recently attracted attention due to their unconventional superconductivity and possible topological superconducting phases.
ANNUAL REVIEW OF CONDENSED MATTER PHYSICS
(2023)
Article
Multidisciplinary Sciences
Ellen Fogh, Bastian Klemke, Manfred Reehuis, Philippe Bourges, Christof Niedermayer, Sonja Holm-Dahlin, Oksana Zaharko, Jurg Schefer, Andreas B. Kristensen, Michael K. Sorensen, Sebastian Paeckel, Kasper S. Pedersen, Rasmus E. Hansen, Alexandre Pages, Kimmie K. Moerner, Giulia Meucci, Jian-Rui Soh, Alessandro Bombardi, David Vaknin, Henrik. M. Ronnow, Olav F. Syljuasen, Niels B. Christensen, Rasmus Toft-Petersen
Summary: Mixed-anisotropy magnet LiNi1-xFexPO4 demonstrates a two orders of magnitude enhancement of magnetoelectric coupling, unlocking symmetry-forbidden couplings and showing potential for tuning magnetoelectric properties.
NATURE COMMUNICATIONS
(2023)
Article
Materials Science, Multidisciplinary
E. M. Smith, J. Dudemaine, B. Placke, R. Schaefer, D. R. Yahne, T. Delazzer, A. Fitterman, J. Beare, J. Gaudet, C. R. C. Buhariwalla, A. Podlesnyak, Guangyong Xu, J. P. Clancy, R. Movshovich, G. M. Luke, K. A. Ross, R. Moessner, O. Benton, A. D. Bianchi, B. D. Gaulin
Summary: The pyrochlore magnet Ce2Zr2O7 has attracted attention as a quantum spin ice candidate due to its dipolar-octupolar nature, and heat capacity and neutron scattering measurements have revealed its complex magnetic properties.
Article
Physics, Multidisciplinary
Yuto Shibata, Manfred Sigrist
Summary: In this study, we investigate the effects of strain modulation on the electronic structures of a two-dimensional single-band chiral p-wave superconductor. By implementing strain modulations through spatially varying hopping matrix elements, we observe the emergence of spontaneous supercurrents and the appearance of chiral edge modes within the system.
PHYSICAL REVIEW RESEARCH
(2022)
Article
Physics, Multidisciplinary
Bastian Zinkl, Keita Hamamoto, Manfred Sigrist
Summary: In this study, the presence of nonreciprocal critical currents, known as the superconducting diode effect, in chiral superconductors is analyzed within a generalized Ginzburg-Landau framework. After deriving the key symmetry conditions, the basic mechanism is illustrated using two examples: the critical current in a thin film and a Josephson junction. The appearance of spontaneous edge currents and the energy bias for the formation of Josephson vortices play a crucial role in splitting the critical currents running in opposite directions. Ultimately, this study interprets the observed superconducting diode effect in the 3-Kelvin phase of Sr2RuO4 as evidence for spontaneously broken time-reversal symmetry in the superconducting phase.
PHYSICAL REVIEW RESEARCH
(2022)
Article
Materials Science, Multidisciplinary
Xinxin Cai, Brian M. Zakrzewski, Yiqun A. Ying, Hae-Young Kee, Manfred Sigrist, J. Elliott Ortmann, Weifeng Sun, Zhiqiang Mao, Ying Liu
Summary: This study reports the detection of distinct features in vortex-crossing induced magnetoresistance oscillations in single-crystal Sr2RuO4 cylinders, providing additional evidence for the existence of spin counterflow half-quantum vortices (HQV) and insights into their physics.
Article
Materials Science, Multidisciplinary
R. Frison, J. Kuespert, Qisi Wang, O. Ivashko, M. V. Zimmermann, M. Meven, D. Bucher, J. Larsen, Ch. Niedermayer, M. Janoschek, T. Kurosawa, N. Momono, M. Oda, N. B. Christensen, J. Chang
Summary: A combined x-ray and neutron diffraction study was conducted on the stripe-ordered superconductor La₀Sr₀.₁₂CuO₄. The crystal structure was found to be consistent with the orthorhombic Bmab space group commonly reported in the literature. However, this structure is not symmetry compatible with the second-order phase transition into the stripe order phase. Many forbidden Bragg peaks in the Bmab space group were observed in this study, and the analysis revealed monoclinic lattice distortions consistent with charge stripe order.
Article
Physics, Multidisciplinary
Maximilian F. Holst, Manfred Sigrist, Mark H. Fischer
Summary: The study systematically analyzes the effect symmetry reductions have on the order-parameter mixing and the edge properties in a superconductor using the two-dimensional Rashba system as an example. The findings show edge (spin) currents independent of bulk topology and continuously evolving topological edge states, highlighting the importance of symmetry over topology for understanding nonquantized edge currents.
PHYSICAL REVIEW RESEARCH
(2022)
Article
Physics, Multidisciplinary
Tobias M. R. Wolf, Maximilian F. Holst, Manfred Sigrist, Jose L. Lado
Summary: Unconventional superconductors, particularly multiorbital systems, have the potential to exhibit exotic nonunitary superconducting states. The microscopic origin of nonunitarity is suspected to involve competing interactions that promote multiorbital order. This study demonstrates that competing interactions can drive nonunitary multiorbital superconductivity, shedding light on the interplay between charge order and superconductivity in unconventional superconducting systems.
PHYSICAL REVIEW RESEARCH
(2022)
Article
Materials Science, Multidisciplinary
Kazuhiro Kimura, Manfred Sigrist, Norio Kawakami
Summary: This study analyzes the impact of critical nematic fluctuations on the low-energy properties of phonons, proposes a method to identify three-state Potts nematic fluctuations through ultrasound attenuation, and demonstrates isotropic effects. It is found that enhancement of the ultrasound attenuation coefficient will be clearly observed in experiments in the case of a weak first-order phase transition.
Article
Materials Science, Multidisciplinary
G. Beaudin, L. M. Fournier, A. D. Bianchi, M. Nicklas, M. Kenzelmann, M. Laver, W. Witczak-Krempa
Summary: EuB6 has attracted the attention of the physics community due to its ferromagnetic phase transition, insulator-metal transition, and colossal magnetoresistance (CMR). Our measurements indicate the presence of a quantum nematic phase in EuB6, which is consistent with the observed magnetic polarons and CMR. This novel interplay between magnetic and electronic properties holds potential for spintronic applications.
Article
Physics, Multidisciplinary
Bastian Zinkl, Manfred Sigrist
Summary: Substituting Ti for Ru in Sr2RuO4 induces incommensurate spin density wave order, leading to magnetic order through nonmagnetic Ti doping. Additionally, spin-orbit coupling effects result in interesting modifications of the magnetic structure when currents run through the system. Our theoretical predictions are consistent with available experimental measurements for Sr2Ru1-xTixO4.
PHYSICAL REVIEW RESEARCH
(2021)
