Article
Physics, Multidisciplinary
Yawen Fang, Gael Grissonnanche, Anaelle Legros, Simon Verret, Francis Laliberte, Clement Collignon, Amirreza Ataei, Maxime Dion, Jianshi Zhou, David Graf, Michael J. Lawler, Paul A. Goddard, Louis Taillefer, B. J. Ramshaw
Summary: The nature of the pseudogap phase in cuprate high-temperature superconductors remains a major puzzle, especially regarding the topology of its Fermi surface. Angle-dependent magnetoresistance (ADMR) data suggests that within the pseudogap phase, the Fermi surface undergoes a transformation consistent with the presence of small nodal hole pockets. This indicates a change in the form of the Fermi surface when the pseudogap is present, potentially explaining the low carrier density in this regime.
Article
Chemistry, Multidisciplinary
Shulun Han, Chi Sin Tang, Linyang Li, Yi Liu, Huimin Liu, Jian Gou, Jing Wu, Difan Zhou, Ping Yang, Caozheng Diao, Jiacheng Ji, Jinke Bao, Lingfeng Zhang, Mingwen Zhao, Milorad V. Milosevic, Yanqun Guo, Lijun Tian, Mark B. H. Breese, Guanghan Cao, Chuanbing Cai, Andrew T. S. Wee, Xinmao Yin
Summary: The recently discovered kagome topological superconductor AV(3)Sb(5) (A = K, Rb, Cs) has a unique structural motif that can host diverse topologically non-trivial phenomena. It remains unclear how atomic-level properties and many-body effects contribute to these symmetry-breaking phenomena. In this study, the role of V3d-Sb5p orbital hybridization in mediating the CDW phase transition in CsV3Sb5 is reported. The results highlight the critical role of Sb orbitals and establish orbital hybridization as the direct mediator of the CDW states and structural transition dynamics in kagome unconventional superconductors.
ADVANCED MATERIALS
(2023)
Article
Physics, Condensed Matter
Artur Malinowski, Valeriy L. Bezusyy, Piotr Nowicki
Summary: In this study, we report the results of an in-plane magnetotransport study on slightly underdoped cuprate La1.85Sr0.15CuO4 (LSCO15) with Ni impurity. The addition of Ni impurity causes a significant drop in longitudinal magnetoresistance (LMR) in LSCO15 and expands the temperature range at which LMR is observed. By comparing the results with the evolution of the pseudogap (PG) from La2-xSrxCuO4 (LSCO) through thermopower measurements, we found that the characteristic temperatures of LMR and PG opening are equivalent. The closing rate of the pseudogap under a magnetic field, as well as the field anisotropy, suggests the involvement of orbital degrees of freedom in the formation of the pseudogap.
JOURNAL OF PHYSICS-CONDENSED MATTER
(2022)
Article
Physics, Multidisciplinary
Francesco Petocchi, Christopher W. Nicholson, Bjoern Salzmann, Diego Pasquier, Oleg Yazyev, Claude Monney, Philipp Werner
Summary: We address the problem of the ground state of 1T-TaS2 by studying the correlated electronic structure of stacked bilayers. The surface termination determines whether the uncorrelated system is band insulating or exhibits a metallic surface state. A Mott gap opens in the surface state but is smaller than the gap originating from the bilayer structure. Our results are consistent with recent experimental measurements and clarify the interplay between Mott insulating and band insulating behavior in this system.
PHYSICAL REVIEW LETTERS
(2022)
Article
Materials Science, Multidisciplinary
Li Cheng, Xuanyu Long, Xiaobin Chen, Xiaolong Zou, Zheng Liu
Summary: The study shows that a flat band in 1T-TaS2 can be understood by adjusting the t(2g) basis, and the rehybridization of three orbitals by the CDW order leads to the formation of the flat band.
Article
Materials Science, Multidisciplinary
Jingwei Dong, Weiyan Qi, Dongbin Shin, Laurent Cario, Zhesheng Chen, Romain Grasset, Davide Boschetto, Mateusz Weis, Pierrick Lample, Ernest Pastor, Tobias Ritschel, Marino Marsi, Amina Taleb, Noejung Park, Angel Rubio, Evangelos Papalazarou, Luca Perfetti
Summary: This study compares the bulk and surface properties of the transition metal dichalcogenide 1T-TaS2. It is found that when heating the sample, the surface exhibits an intermediate insulating phase while the bulk remains metallic. The amplitude mode at the surface is always stiffer and shows variable coupling to the Mott-Peierls band in different phases.
Article
Chemistry, Multidisciplinary
Mengjing Wang, Aakash Kumar, Hao Dong, John M. Woods, Joshua Pondick, Shiyu Xu, David J. Hynek, Peijun Guo, Diana Y. Qiu, Judy J. Cha
Summary: A new electronic phase in WTe2 induced by lithium intercalation is discovered, which exhibits increasing resistivity with decreasing temperature and lower carrier density compared to the semimetallic phase. The theoretical calculations and in situ transport data suggest that this new phase is a potential charge density wave phase with a bandgap of approximately 0.14 eV. The structural characterization reveals large lattice distortions in the new phase.
ADVANCED MATERIALS
(2022)
Article
Physics, Condensed Matter
E. V. L. de Mello
Summary: The study shows that the behavior of superfluid density n(sc) in cuprates is influenced by the superconducting interaction based on charge fluctuations in incommensurate charge-density-wave (CDW) domains. This interaction scales with CDW amplitude or pseudogap (PG) energy, producing local superconducting amplitudes and Josephson currents. The research also reveals how the intertwined orders of pseudogap-CDW-superconductivity operate to create cuprates properties.
JOURNAL OF PHYSICS-CONDENSED MATTER
(2021)
Article
Physics, Applied
Anila Kanwal, Nawazish Ali Khan
Summary: This study highlights the significant role of substituting different types of atoms on superconducting properties. The characterization results of various samples were reported and analyzed using XRD, RT, and FTIR measurements. Crystal structures were successfully constructed and microstructural analysis was conducted via SEM. Notably, the samples without CuO2 planes exhibited superconducting behavior above 77 K. Furthermore, the role of Cu(3d(9)) atoms in superconductivity was verified through the synthesis of different ion-doped samples.
JOURNAL OF SUPERCONDUCTIVITY AND NOVEL MAGNETISM
(2023)
Article
Chemistry, Multidisciplinary
Tao Jia, Zhuoyu Chen, Slavko N. Rebec, Makoto Hashimoto, Donghui Lu, Thomas P. Devereaux, Dung-Hai Lee, Robert G. Moore, Zhi-Xun Shen
Summary: The enhanced superconductivity in monolayer FeSe on titanates is achieved by inserting epitaxial LaTiO3 layers between monolayer FeSe and SrTiO3, resulting in systematic modulation of interfacial chemical potential and significant increase of electron accumulation, leading to a substantial surge of work function mismatch across the FeSe/oxide interface. This unexpected finding suggests the existence of an intrinsically anchored magic doping within the monolayer FeSe systems.
Review
Physics, Multidisciplinary
Rong Li, Zhen-Su She
Summary: The central conundrum of the cuprate pseudogap and its relationship to symmetry-breaking orders in unconventional superconductors lie in the modeling of simultaneous organizations in multiple degrees of freedom. Recent studies focus on exploring the spatial organization and intertwining mechanism of multiple orders, revealing a universal energy-length scaling. This scaling quantitatively explains the nontrivial magnitude and doping dependence of the pseudogap energy and critical temperature, shedding light on the spatial organization mechanism of intertwined orders and their possible composite energy scaling.
FRONTIERS IN PHYSICS
(2022)
Article
Materials Science, Multidisciplinary
Lukas Schwarz, Rafael Haenel, Dirk Manske
Summary: This paper introduces the use of THG experiments on superconductors to study collective excitations like the Higgs mode, and additionally analyzes the phase of the THG signal for the first time, highlighting the importance of phase information in interpreting experimental results.
Article
Materials Science, Multidisciplinary
C. J. Butler, M. Yoshida, T. Hanaguri, Y. Iwasa
Summary: Recent theoretical investigations have shown that experimental observation of quantum spin liquids is possible using scanning tunneling microscopy, with the appearance of resonances at the edge of the upper Hubbard band being shifted under external magnetic field. In this study, scanning tunneling microscopy observations were conducted on samples of the quantum spin liquid candidate 1T-TaS2, revealing a conductance peak at the upper Hubbard band edge and its magnetic field dependence, potentially providing evidence for the existence of a quantum spin liquid in 1T-TaS2. The absence of field dependence in some samples suggests the presence of material properties yet to be understood, motivating further investigation.
Article
Chemistry, Multidisciplinary
Martin M. Botana, Manuel V. Ramallo
Summary: This study investigates the critical fluctuations near the resistive transition in very thin films of high-temperature cuprate superconductors. The fluctuation spectrum of a Gaussian-Ginzburg-Landau model is solved, considering two alternating Josephson interlayer interaction strengths, to obtain the paraconductivity above the transition. These calculations are then extended to temperatures below the transition using expressions for the Ginzburg number and Kosterlitz-Thouless-like critical region. The results provide a plausible scenario for the critical regime in YBa2Cu3O7-delta few-bilayers systems.
Article
Chemistry, Multidisciplinary
Hossain Mohammad Ikram, Ara Ferdous, Shahed Syed Mohammad Fakruddin, Zhipeng Wang, Tadahiro Komeda
Summary: We report the finding of a 1T phase island of NbSe2 on a cleaved surface and its magnetic properties. The magnetic moment placed in the superconducting state generates the Yu-Shiba-Rusinov (YSR) state with specific position and anisotropic decay behavior. The enhancement of the YSR peak is closely related to the local curvature of the film.
Article
Multidisciplinary Sciences
Zhendong Jin, Yangmu Li, Zhigang Hu, Biaoyan Hu, Yiran Liu, Kazuki Iida, Kazuya Kamazawa, Matthew B. Stone, Alexander I. Kolesnikov, Douglas L. Abernathy, Xiangyu Zhang, Haiyang Chen, Yandong Wang, Chen Fang, Biao Wu, Igor A. Zaliznyak, John M. Tranquada, Yuan Li
Summary: A large body of knowledge about magnetism is obtained from models of interacting spins on magnetic ions. However, proposals beyond the ionic picture are rare and rarely verified. In this study, using inelastic neutron scattering, it is found that the fundamental magnetic units in the near-ferromagnet MnSi are extended molecular orbitals consisting of three Mn atoms, contrasting the ionic picture. This discovery provides important insights into both MnSi and a broad range of magnetic quantum materials.
Article
Chemistry, Multidisciplinary
Ana F. Suzana, Sizhan Liu, Jiecheng Diao, Longlong Wu, Tadesse A. Assefa, Milinda Abeykoon, Ross Harder, Wonsuk Cha, Emil S. Bozin, Ian K. Robinson
Summary: When synthesized under certain conditions, barium titanate (BTO) nanoparticles show a non-thermodynamic cubic structure and have an enhanced dielectric constant. These nanoparticles are widely used in thin-layer capacitors. Characterization methods, including X-ray refinement and the Williamson-Hall approach, reveal the presence of notable strain associated with the cubic phase. However, X-ray pair distribution function measurements indicate a lower symmetry local structure.
ADVANCED FUNCTIONAL MATERIALS
(2023)
Article
Chemistry, Physical
Connor A. Occhialini, Joshua J. Sanchez, Qian Song, Gilberto Fabbris, Yongseong Choi, Jong-Woo Kim, Philip J. Ryan, Riccardo Comin
Summary: The origin of nematicity in FeSe is studied using X-ray linear dichroism and X-ray diffraction measurements. It is found that spontaneous orbital polarization serves as the primary order parameter of the nematic phase, providing strong evidence for an orbital mechanism driving nematicity.
Review
Chemistry, Physical
Ralf F. F. Ziesche, Thomas M. M. Heenan, Pooja Kumari, Jarrod Williams, Weiqun Li, Matthew E. E. Curd, Timothy L. L. Burnett, Ian Robinson, Dan J. L. Brett, Matthias J. J. Ehrhardt, Paul D. D. Quinn, Layla B. B. Mehdi, Philip J. J. Withers, Melanie M. M. Britton, Nigel D. D. Browning, Paul R. R. Shearing
Summary: The demand for low carbon energy storage has emphasized the importance of imaging techniques in characterizing electrode microstructures, determining key parameters for battery manufacture, operation, degradation, and failure in both next generation lithium batteries and other novel battery systems. This review summarizes recent progress and highlights in magnetic resonance, neutron, X-ray, focused ion beam, scanning and transmission electron microscopy. Two major trends are identified: the use of multi-modal microscopy in a correlative fashion, providing contrast modes across length and time scales, and the application of machine learning to guide data collection and analysis, recognizing the role of these tools in evaluating large data streams from increasingly sophisticated imaging experiments.
ADVANCED ENERGY MATERIALS
(2023)
Article
Chemistry, Physical
Longlong Wu, Seongmin Bak, Youngho Shin, Yong S. Chu, Shinjae Yoo, Ian K. Robinson, Xiaojing Huang
Summary: Multimodal hard X-ray scanning probe microscopy combines ptychography with X-ray fluorescence (XRF) microscopy to study functional materials, providing both structural and chemical information. A machine learning model is developed to enhance spatial resolution by decoupling the effect of X-ray probe from the XRF signal, showing superior performance compared to traditional scanning XRF methods. The proposed method can be widely applied in functional materials and biological imaging with XRF microscopy and related applications.
NPJ COMPUTATIONAL MATERIALS
(2023)
Article
Multidisciplinary Sciences
A. de la Torre, B. Zager, F. Bahrami, M. H. Upton, J. Kim, G. Fabbris, G. -H Lee, W. Yang, D. Haskel, F. Tafti, K. W. Plumb
Summary: The authors characterize the material candidate H3LiIr2O6 and find a broad continuum of collective excitations absent of a momentum dependence, suggesting a disordered topological spin liquid. Understanding the interaction between inherent disorder and the fluctuating-spin ground state is crucial for the search of quantum spin liquids.
NATURE COMMUNICATIONS
(2023)
Article
Chemistry, Multidisciplinary
Naga Vishnu Vardhan Mogili, Nathalia Carolina Verissimo, A. M. Milinda Abeykoon, Emil S. Bozin, Jefferson Bettini, Edson Roberto Leite, Joao Batista Souza Junior
Summary: The local structural characterization of iron oxide nanoparticles is explored using the pair distribution function (PDF) analysis method. By pre-treating the background function, the successful implementation of the e-PDF technique is achieved to study the local structure of the considered nanomaterial.
ACTA CRYSTALLOGRAPHICA A-FOUNDATION AND ADVANCES
(2023)
Article
Materials Science, Multidisciplinary
Machteld E. Kamminga, Kristine M. L. Krighaar, Astrid T. Romer, Lise O. Sandberg, Pascale P. Deen, Martin Boehm, Genda D. Gu, John M. Tranquada, Kim Lefmann
Summary: We investigated the effect of uniaxial stress on magnetic stripes in the cuprate system La2-xBaxCuO4. The superconducting transition temperature was found to be enhanced under stress. Neutron scattering confirmed that stress suppresses static stripes, suggesting a trade-off between superconductivity and static magnetism. Our results also revealed a displacement of weight from the elastic channel to the inelastic channel and a shift in the momentum of fluctuations towards the typical 1/8 value of commensurability.
Article
Materials Science, Multidisciplinary
M. R. Norman, A. S. Botana, J. Karp, A. Hampel, H. LaBollita, A. J. Millis, G. Fabbris, Y. Shen, M. P. M. Dean
Summary: This paper presents a simple formalism for calculating x-ray absorption and resonant inelastic x-ray scattering, which uses the density of states as input from a single-particle or many-body ab initio calculation and is designed to capture itinerant like features. The formalism is applied to calculate XAS and RIXS for reduced valence nickelates, cuprate, and unreduced nickelate compounds. The results show strong orbital polarization in reduced valence nickelates and reproduce key aspects of a recent RIXS experiment for R4Ni3O8. Implications for the nature of 3d electrons in reduced valence nickelates are discussed.
Article
Materials Science, Multidisciplinary
J. Sears, Y. Shen, M. J. Krogstad, H. Miao, E. S. Bozin, I. K. Robinson, G. D. Gu, R. Osborn, S. Rosenkranz, J. M. Tranquada, M. P. M. Dean
Summary: The interaction between charge density wave (CDW) and lattice plays a crucial role in La1.875Ba0.125CuO4, inducing periodic modulation of Cu-Cu spacing within the CuO2 planes and out-of-plane breathing modulation of lanthanum layers. The CDW-related structural distortions propagate through the crystal, leading to overlapping structural modulations in adjacent layers and within the same layer. This effect could facilitate the coupling of CDWs between adjacent planes.
Article
Materials Science, Multidisciplinary
I. Mohelsky, J. Wyzula, B. A. Piot, G. D. Gu, Q. Li, A. Akrap, M. Orlita
Summary: Using Landau-level spectroscopy, the temperature dependence of the energy band gap in zirconium pentatelluride (ZrTe5) is determined. It is found that the band gap reaches E-g = (5 & PLUSMN; 1) meV at low temperatures and increases monotonically with the temperature. This implies that ZrTe5 is a weak topological insulator with noninverted ordering of electronic bands in the center of the Brillouin zone. Magnetotransport experiments show that the resistivity anomaly in ZrTe5 is not connected with the temperature dependence of the band gap.
Article
Materials Science, Multidisciplinary
Blair W. Lebert, Benjamin Bacq-Labreuil, Mark P. M. Dean, Kari Ruotsalainen, Alessandro Nicolaou, Simo Huotari, Ikuya Yamada, Hajime Yamamoto, Masaki Azuma, Nicholas B. Brookes, Flora Yakhou, Hu Miao, David Santos-Cottin, Benjamin Lenz, Silke Biermann, Matteo d'Astuto
Summary: Resonant inelastic x-ray scattering was used to investigate the paramagnon dispersion and damping in undoped and doped cuprate compounds, revealing that there is no simple relation between the spin-exchange parameter and the critical temperature. Cluster dynamical mean-field theory calculations of the dynamical spin structure factor were in excellent agreement with the experiment in the undoped case, but showed a significant softening at X in doped cuprates.