Bulletin of the American Physical Society
APS March Meeting 2023
Volume 68, Number 3
Las Vegas, Nevada (March 5-10)
Virtual (March 20-22); Time Zone: Pacific Time
Session UU07: V: Superconductivity II |
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Sponsoring Units: DCMP Chair: Ulrich Welp, Argonne National Laboratory Room: Virtual Room 7 |
Wednesday, March 22, 2023 5:00AM - 5:12AM |
UU07.00001: Candidate for Second Dome of Superconductivity in a Cuprate at High Pressures Johannes S Nokelainen, Matthew Matzelle, Christopher A Lane, Ruiqi Zhang, Nabil Atlam, Robert S Markiewicz, Bernardo Barbiellini, Jianwei Sun, Arun Bansil Evidence is growing that a second dome of higher-Tc superconductivity can be accessed in cuprates by pushing the Cu valence towards 3+, either by replacing La by Ba or Sr in La2CuO4 or by using high pressure to overdope Bi cuprates. While Sr2CuO4 and Ba2CuO4 are found to superconduct at considerably higher temperatures than La2CuO4, they are quite difficult to analyze as they are strongly oxygen-deficient and there is ongoing debate about which phase is superconducting and where the vacancies are. Here we use ab initio studies to reveal that pressure can turn a related cuprate into an ideal candidate for second-dome superconductivity, displaying the predicted signature structure of strongly hybridized d-d orbitals. |
Wednesday, March 22, 2023 5:12AM - 5:24AM |
UU07.00002: Effect of electron irradiation on YBa2Cu3O7−δ superconductor from London penetration depth measurement Kyuil Cho, Marcin Konczykowski, Serafim Teknowijoyo, Vivek Mishra, Sunil Ghimire, Makariy A Tanatar, Ruslan Prozorov Temperature-dependent London penetration depth λ (T) of optimally doped YBa2Cu3O7−δ single crystals was measured by increasing controlled artificial disorders via 2.5 MeV electron irradiation. The irradiation caused significant suppression of the superconductors critical temperature and the low-temperature behavior of λ (T) evolves from a T-linear in pristine state to a T2 behavior after the irradiation, expected for a line-nodal d-wave superconductor. According to the normalized superfluid density analysis, we found that the scattering potential strength is estimated in between Born and Unitary limits with a phase shift to be around 65 degree. |
Wednesday, March 22, 2023 5:24AM - 5:36AM |
UU07.00003: Supercurrent-induced Anomalous Thermal Hall Effects as a New Probe to Superconducting Pairing Anisotropy Xiaodong Hu, Ying Ran Two-dimensional superconductors have been realized in various atomically thin films, some of which are anticipated to involve unconventional pairing mechanisms, including twisted bilayer graphene (TBG) and FeSe. Due to the low dimensionality, experimental probes of the superconductivity in these systems have been limited. In this paper we consider a Josephson junction formed by stacking two superconducting thin films, and propose an anomalous thermal hall effect induced by the Josephson supercurrent, in the absence of an external magnetic field. Interestingly, we find that this effect sharply probes the in-plane anisotropy of the superconducting gap function $Delta_k$, which may be useful in experimental investigations on two-dimensional superconductivity in systems such as TBG. |
Wednesday, March 22, 2023 5:36AM - 5:48AM |
UU07.00004: Spectroscopic signatures of bipolaron dissociation in spectral functions of the Hubbard-Holstein model Alberto Nocera, Mona I Berciu We study the spectral functions of the one dimensional Holstein model of electron-phonon coupling at low but finite electronic densities, both for spinless as well as for spinful electrons. In the spinless case, and for small-to-intermediate couplings, we obtain an excellent agreement between variationally exact density matrix renormalization group (DMRG) simulations evaluated directly in frequency-space and a semianalytical generalized Momentum Average variational approximation proposed recently in [M Berciu, J. Phys. Mater. 5 044002 (2022)] which assumed that besides single polarons, the remaining fermions in the system are locked into an inert Fermi sea. In the spinfull case, the DMRG numerics unveils an anomalous dispersive feature at small momenta as a function of Coulomb repulsion strength which we link to the dissociation of the bipolaronic metallic state into a polaronic liquid. |
Wednesday, March 22, 2023 5:48AM - 6:00AM |
UU07.00005: On spectral properties in one-dimensional extended Hubbard model: a bosonization analysis and numerical inspection Hao-Xin Wang, Yi-Ming Wu, Yifan Jiang, Hong Yao Recent ARPES experiments of doped one-dimensional (1D) cuprate chains reveal a possible near-neighbor attraction induced by electron-phonon coupling. Here we examine the spectral properties based on the extended Hubbard model with both the on-site repulsion $U$ and a nearest neighbor interaction $V$, by using phenomenological bosonization analysis as well as the high-precision time-dependent variational principle calculation. We find that the spectral weights of the holon-folding and $3k_F$ branches evolve reversely with the change of $V$ for $|V|leq2t$. We argue that this peculiar dichotomy can be explained by the opposite dependence of the exponent $gamma_{ ho,m}$, which determines the spectral property, on the Luttinger parameter $K_{ ho}$. We also find in the 1D cuprate $Vapprox -1.7t$, which may indicate a strong enhancement of superconductivity in the parent two-dimensional material. |
Wednesday, March 22, 2023 6:00AM - 6:12AM |
UU07.00006: Micro-ARPES study of the kagome superconductor CsV3Sb5 Takemi Kato, Yongkai Li, Kosuke Nakayama, Zhiwei Wang, Seigo Souma, Miho Kitamura, Koji Horiba, Hiroshi Kumigashira, Takashi Takahashi, Takafumi Sato We have investigated the electronic structure of the kagome superconductor CsV3Sb5 by micro-focused angle-resolved photoemission spectroscopy [1, 2]. We found evidence for the polar nature of the cleaved surface which is characterized by Cs- and Sb-terminated surfaces with markedly different fermiology. |
Wednesday, March 22, 2023 6:12AM - 6:24AM |
UU07.00007: Comprehensive characterizing of vortex phases in type-II superconductor YBa2Cu3O7-x by a magnetoelectric technique Yisheng Chai Superconductors (SC) have two fundamental properties, zero resistivity and perfect diamagnetism which can fully exclude small external magnetic field in principle. The m0H field inside the SC remains zero until the superconductivity is fully destroyed when the external field H is above a critical field Hc1 in type-I SC. However, due to the negative interface energy between superconducting and normal phases, the magnetic field lager than Hc1 can sometime penetrate the SC phase instead of it in type-II SC. Above Hc1, the magnetic field enters a type II SC in the form of quantized vortices, each carrying one quantum of vortex ?0=hc/2e, and the vortices could form regular triangular or square lattice as a two dimensional solid state. So far, one method that is relatively simple, cheap and fast, which is able to characterize the vortex phases and phase boundaries comprehensively, is still lacking. |
Wednesday, March 22, 2023 6:24AM - 6:36AM |
UU07.00008: Electronic Excitations Probed by Raman Spectroscoy in BiSr2Ca2Cu2O4+δ Cuprate Superconductors manel mezidi, alexandr Alekhin, Anne Forget, Dorothée Colson, Genda Gu, Sarah Houver, Maximilien Cazayous, Yann Gallais, Louis Taillefer, Alain Sacuto The transformation from an antiferromagnetic (AF) Mott insulator to a metal superconductor as the holes number increases is a key element for understanding the physics of cuprates [1,2]. In this work, we tracked the doping dependence of the spin singlet excitation related to the AF lattice, the normal state quasiparticles excitation related to the mobile charge carriers and the Bogoliubov quasiparticles related to the superconducting gap in the BiSr2Ca2Cu2O4+δ (Bi-2212) cuprate by polarization resolved Raman spectroscopy measurements. The Pseudogap phase and the Mott insulator AF phase are intimately related such as the drop of temperature favors the reconstruction of the AF lattice, therefore the charge carriers are blocked. This result can be interpreted as a new signature of the Pseudogap at higher energy [3]. We also noticed that the maximum amplitude of the SC gap <!--[if gte msEquation 12]> style='font-family:"Cambria Math",serif;mso-ascii-font-family:"Cambria Math"; |
Wednesday, March 22, 2023 6:36AM - 6:48AM |
UU07.00009: Toward control and manipulation of superconducting vortex lattices from nano to mesoscales Sang Yong Song, Jiaqiang Yan, Wonhee Ko, Eugene F Dumitrescu, Gábor Halász, Chengyun Hua, Hans Fangohr, Benjamin J Lawrie, Petro Maksymovych Vortices in unconventional superconductors can support fundamentally new electronic excitations and act as a basic building block of quantum computing architecture. Finding new pathways to control the morphology and dynamics of vortex lattices will be critical to the development of emerging quantum technologies. In this talk, we will discuss the following things. First, we observed that the twin boundary in the FeSe superconductor traps a relatively high density of vortices and acts as a barrier that aligns the vortices on the terrace parallel to the twin boundary. The alignment effect causes various phases of vortex lattice structures such as rectangular and one-dimensional vortex lattices. By comparing theoretical predictions with experimental results, we have inferred the characteristic energetics of the interaction between superconducting and nematic order parameters, and we have predicted the existence of geometric size effects on the symmetry of the vortex lattice subject to confinement by the crossing twin boundaries. Second, we found that the vortex cores are extended as progressively increases current density using STM. Furthermore, we manipulated the local distribution of vortices under extreme conditions. We will discuss candidates for driving forces. These results give us valuable information to understand the properties of vortex-bound state under driving force, and the detailed mechanism of vortex manipulation. Altogether we suggest that precise control over the high tunneling current can translate into an effective vortex manipulation approach without destruction of the superconducting state, with the possibility of one or several driving mechanisms depending on specific conditions. Our results give valuable hints to the understanding of vortex manipulation in STM geometry toward quantitative nanoscale probes of vortex dynamics and a platform to explore vortex manipulation in the context of topological quantum computing. |
Wednesday, March 22, 2023 6:48AM - 7:00AM |
UU07.00010: Molecular + Field Dynamics (MFD) Simulation on Vortex dynamics in a Superconductor Masaru Kato, Jun Yamanaka We have developed an extended molecular dynamics simulation method on vortex dynamics including current field and impurity potential. We call it molecular + field dynamics (M+FD). Using this method, we can investigate dynamics of several ten thousand of vortices. In the usual molecular dynamics (MD) method, we must calculate the vortex-vortex interactions between all pairs of vortices and also pinning forces between all of vortices and all of impurities. These calculations take much time, and therefore number of vortices that we can treat is limited. Vortex-vortex interaction comes from current around every vortex. So, if we can calculate current distribution from all of vortices including an external current, we can obtain vortex-vortex interaction for a single vortex from all other vortices locally. We also use the FEM for computation of pinning force form an impurity potential. In our M+FD method, we sue the finite element method (FEM) to treat the current distribution. Our method is useful for investigation of phenomena that include many vortices, such as bundle motion of vortices and avalanche behavior of vortices. |
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