cond-mat.supr-con papers

Oxygen-isotope effect on density wave transitions in La $_3$ Ni $_2$ O $_{7}$

This study demonstrates that oxygen isotope substitution ( $^{16}\text{O} \rightarrow ^{18}\text{O}$ ) significantly increases the charge-density wave transition temperature in La $_3$ Ni $_2$ O $_7$ while leaving the spin-density wave transition unaffected, indicating that lattice vibrations drive charge ordering whereas spin ordering is primarily electronic in origin.

Rustem Khasanov, Vahid Sazgari, Igor Plokhikh, Lifen Shi, KeYuan Ma, Marisa Medarde, Ekaterina Pomjakushina, Tomasz Klimczuk, Thomas J. Hicken, Hubertus Luetkens, Christof W. Schneieder, Zurab Guguchia, Sergey Medvedev, Dariusz J. GawrylukWed, 11 Ma🔬 cond-mat

Ionic-Bond-Driven Atom-Bridged Room-Temperature Cooper Pairing in Cuprates and Nickelates: a Theoretical Framework Supported by 32 Experimental Evidences

This paper proposes a theoretical framework asserting that high-temperature superconductivity in cuprates and nickelates is driven by ionic-bond-mediated electron pairing bridged by oxygen or metal atoms, a mechanism supported by 32 experimental evidences and offering a potential path toward room-temperature superconductivity.

Jun-jie Shi, Yao-hui ZhuWed, 11 Ma🔬 cond-mat

Effect of Pressure and Oxygen-Isotope Substitution on Density-Wave Transitions in La $_4$ Ni $_3$ O $_{10}$

This study utilizes muon-spin rotation and resistivity measurements to reveal that in the trilayer nickelate La $_4$ Ni $_3$ O $_{10}$ , pressure suppresses intertwined spin- and charge-density-wave transitions at a uniform rate while oxygen-isotope substitution selectively enhances the charge-density-wave transition, highlighting a distinct coupling between charge and spin orders that differs from bilayer nickelates.

Rustem Khasanov, Vahid Sazgari, Thomas J. Hicken, Igor Plokhikh, Marisa Medarde, Ekaterina Pomjakushina, Lukas Keller, Vladimir Pomjakushin, Marek Bartkowiak, Szymon Królak, Michał J. Winiarski, Alexander Steppke, Jonas A. Krieger, Hubertus Luetkens, Tomasz Klimczuk, Christof W. Schneider, Dariusz J. Gawryluk, Zurab GuguchiaWed, 11 Ma🔬 cond-mat

Critical behavior of the thermal phase transition of U(1) lattice gauge systems

This paper employs Monte Carlo simulations of a U(1) lattice gauge system to demonstrate that the thermal phase transition of a superconductor belongs to the XY universality class, exhibiting critical exponents consistent with Bose-Einstein condensation and neutral boson transitions.

Greta Sophie Reese, Ludwig MatheyWed, 11 Ma🔬 cond-mat

Evidence of universal spectral collapse at a marginal dynamical regime

This paper demonstrates that incoherent electronic spectra across diverse strongly correlated materials arise from self-generated dynamical disorder and collapse onto a single universal curve described by a parabolic cylinder function, revealing a marginal dynamical regime where microscopic details become irrelevant at low energies.

Udomsilp Pinsook, Pakin Tasee, Jakkapat SeeyangnokWed, 11 Ma🔬 cond-mat

Critical point of the transition between $s_\pm$ and $s_{++}$ states of a two-band superconductor with nonmagnetic impurities

This paper demonstrates that the transition between $s_\pm$ and $s_{++}$ superconducting states in a two-band model with nonmagnetic impurities evolves from a smooth crossover at high temperatures to a first-order phase transition at low temperatures, thereby establishing a critical end point on the temperature-impurity scattering rate phase diagram that suggests the possibility of a quantum phase transition.

V. A. Shestakov, M. M. KorshunovWed, 11 Ma🔬 cond-mat

Temporal Berry Phase and the Emergence of Bose-Glass-Analog Phase in a Clean U(1) Superfluid

This paper demonstrates that a temporal Berry phase in a clean U(1) nonlinear sigma model induces space-time anisotropic vortex interference, leading to a quasi-disordered phase with short-range spatial order and persistent temporal coherence that shares the essential correlation properties of the disordered Bose Glass phase, thereby suggesting a unified topological origin for glassy behavior in phase-fluctuation-driven superfluid transitions.

Ryuichi Shindou, Pengwei Zhao, Xiaonuo FangWed, 11 Ma🔬 cond-mat

Intrinsic magnetization of the superconducting condensate in Fe(Te,Se)

This paper provides experimental evidence for intrinsic, spin-polarized superconductivity in mesoscopic Fe(Te,Se) rings, characterized by a current-dependent magnetic field and dual flux quantization that is explained by a model combining Rashba coupling with anisotropic out-of-plane interactions.

Mohammad Javadi Balakan, Shiva Heidari, Genda Gu, Qiang Li, Kenji Watanabe, Takashi Taniguchi, Ji Ung LeeWed, 11 Ma🔬 cond-mat.mes-hall

From perovskite to infinite-layer nickelates: hole concentration from x-ray absorption

Using soft x-ray absorption spectroscopy, this study reveals that infinite-layer nickelate thin films do not achieve the assumed pure $d^9$ configuration even when maximally reduced, as quantitative analysis shows a persistent nickel $3d $hole count of 1.35 alongside oxygen$ 2p$ holes, indicating a complex interplay of self-doping and oxygen non-stoichiometry.

R. Pons, M. Flavenot, K. Fürsich, E. Schierle, E. Weschke, M. R. Cantarino, E. Goering, P. Nagel, S. Schuppler, G. Kim, G. Logvenov, B. Keimer, R. J. Green, D. Preziosi, E. BenckiserTue, 10 Ma🔬 cond-mat.mtrl-sci

Quasiparticle spectroscopy in tantalum films with different Ta/sapphire interfaces

This paper introduces a non-destructive frequency-domain quasiparticle spectroscopy technique using precision resonators to identify low-energy excitations, such as two-level systems and Yu-Shiba-Rusinov states, in tantalum films on sapphire substrates, thereby linking these microscopic defects to reduced internal quality factors in superconducting circuits.

Bicky S. Moirangthem, Kamal R. Joshi, Anthony P. Mcfadden, Jin-Su Oh, Amlan Datta, Makariy A. Tanatar, Florent Lecocq, Raymond W. Simmonds, Lin Zhou, Matthew J. Kramer, Ruslan ProzorovTue, 10 Ma🔬 cond-mat.mtrl-sci

Exploiting Negative Capacitance for Unconventional Coulomb Engineering

This paper proposes that leveraging negative capacitance in engineered structures can invert the natural repulsive Coulomb interaction between electrons into an attractive force, thereby enabling new regimes of Coulomb engineering that could stabilize unconventional correlated phases such as superconductivity.

Aravindh Shankar, Pramey Upadhyaya, Supriyo DattaTue, 10 Ma🔬 cond-mat.mes-hall

High-temperature superconductivity in flat-band sheared bilayer graphene

This paper proposes that heterosheared bilayer graphene hosts high-temperature superconductivity driven by 1D moiré flat bands, where valley polarization enables Cooper pair condensation by spatially separating electrons of opposite spins to minimize Coulomb repulsion.

Jose Gonzalez, Tobias StauberTue, 10 Ma🔬 cond-mat.mes-hall

Signatures of Topological Superconductivity and Josephson Diode Effects on the Magnetocurrent-Phase Relation of Planar Josephson Junctions

This paper theoretically demonstrates that magneto-current-phase relation measurements in proximitized planar Josephson junctions serve as a versatile spectroscopic tool to reconstruct ground-state phases, quantify Rashba spin-orbit coupling, diagnose topological gap closings, and characterize the Josephson diode effect.

B. Pekerten, A. Chilampankunnel Prasannan, A. Matos-AbiagueTue, 10 Ma🔬 cond-mat.mes-hall

Flux Trapping Characterization for Superconducting Electronics Using a Cryogenic Widefield NV-Diamond Microscope

This paper introduces a cryogenic widefield NV-diamond microscope that enables rapid, micrometer-scale imaging of magnetic flux trapping in superconducting devices, revealing critical vortex expulsion behaviors in Nb thin films and offering a high-throughput tool for improving the reliability of scalable superconducting electronics.

Rohan T. Kapur, Pauli Kehayias, Sergey K. Tolpygo, Adam A. Libson, George Haldeman, Collin N. Muniz, Alex Wynn, Nathaniel J. O'Connor, Neel A. Parmar, Ryan Johnson, Andrew C. Maccabe, John Cummings, Justin L. Mallek, Danielle A. Braje, Jennifer M. SchlossTue, 10 Ma⚛️ quant-ph

Photon-Blockade Analogue Nonreciprocal Absorption in Spatiotemporal Metasurfaces

This paper proposes a superconducting spatiotemporal metasurface that achieves one-way nonreciprocal absorption through a classical analogue of photon blockade, where forward waves are resonantly absorbed via harmonic conversion while backward waves transmit freely, offering a promising pathway for compact quantum information devices.

Sajjad TaravatiTue, 10 Ma⚛️ quant-ph

Hybrid light-matter excitations and spontaneous time-reversal symmetry breaking in two-dimensional Josephson Junctions

This paper investigates the inductive coupling between a quantum LC resonator and a graphene-based Josephson junction, revealing that the system's current-phase relation can exhibit spontaneous time-reversal symmetry breaking and predicting the low-energy spectrum of hybridized light-matter excitations.

V. Varrica, G. Falci, E. Paladino, F. M. D. PellegrinoTue, 10 Ma⚛️ quant-ph

Higgs gap modes in superconducting circuit quantisation

This paper extends a projective circuit quantisation approach to incorporate superconducting Higgs modes by deriving and numerically validating analytical results for the gap dynamics' mass, spring constant, and frequency, while also computing anharmonic corrections for small superconducting islands.

Yun-Chih Liao, Ben J. Powell, Thomas M. StaceTue, 10 Ma⚛️ quant-ph

Superconductivity onset above 60 K in ambient-pressure nickelate films

This paper reports the discovery of ambient-pressure superconductivity with an onset temperature of approximately 63 K in compressively strained (La,Pr)₃Ni₂O₇ thin films, achieved via a giant-oxidative atomic-layer-by-layer epitaxy method that enhances interlayer coupling and links the high transition temperature to strange-metal behavior.

Guangdi Zhou, Heng Wang, Haoliang Huang, Yaqi Chen, Fei Peng, Wei Lv, Zihao Nie, Wei Wang, Qi-Kun Xue, Zhuoyu ChenThu, 12 Ma🔬 cond-mat

Characterization of Josephson Junction Aging and Annealing Under Different Environments

This study characterizes the aging and thermal annealing of Josephson junctions, revealing that their resistance evolution follows a logarithmic curve dependent on fabrication and storage conditions, while thermal annealing in nitrogen consistently lowers resistance compared to ambient conditions, though neither method can reduce resistance below its initial value.

Rangga P. Budoyo, Rasanayagam S. Kajen, Bing Wen Cheah, Long H. Nguyen, Rainer DumkeThu, 12 Ma⚛️ quant-ph

Dimensionality of vortex matter in superconducting infinite-layer nickelates

This study reveals that the dimensionality of superconductivity in infinite-layer nickelates is extrinsically controlled by disorder, where low disorder yields a quasi-two-dimensional vortex state while increased disorder drives a crossover to a pure two-dimensional state due to the decoupling of NiO₂ planes.

D. Sanchez-Manzano, V. Humbert, D. Zhang, A. Gutiérrez-Llorente, M. Bibes, J. Santamaria L. Iglesias, Javier E. VillegasThu, 12 Ma🔬 cond-mat

cond-mat.supr-con

Oxygen-isotope effect on density wave transitions in La3_33​Ni2_22​O7_{7}7​