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Common Threads in Unconventional Superconductors (8598)

February 27, 2017 – March 03, 2017

Location: Lorentz Center at Oorty , Leiden, The Netherlands

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Overview

Last few years have been exceptionally prolific for superconductivity with discoveries of several new materials classes, inventive heterostructures, novel tuning parameters, intertwined phases (such as charge density wave, nematic order etc), strange metals with or without a critical point at the superconducting dome. These discoveries have helped obtaining higher tunability of the superconducting properties, and new insights which have revived some of the earlier understandings. A basic theme of the workshop is to explore and unify the common properties, combining both earlier and recent results, displayed in all classes of unconventional superconductors including copperoxides, heavy-fermions, organics, newly discovered iron-pnictide, chalcogenides, and various heterostructures. Such a comprehensive workshop discussing all families together have not much been held earlier, where either focus was given to a given family or different materials were split into parallel sessions.

Unconventional superconductivity is often intervened by correlated physics such as electronic orders and/ or non-Fermi-liquid or strange metal phase, whose nature changes drastically in different materials, making it a difficult problem to solve. We will explore new experimental methods and tunabilities which will enable to individually control the correlated physics and superconductivity with the goal to illuminate how their interplay results in strong Cooper pairing. Experts from all fields will discuss on designing focused experiments which can be carried out in all materials families so that common and important features can be unraveled. Substantial emphasis will be given to utilize the recently developed high-resolution spectroscopies, and multifaceted sample preparation techniques, and multiple tunings methods. An equal focus will be given to the theoretical aspects of both electronic correlation and superconductivity where existing approaches based on strong coupling or weak coupling theories are challenged. A question of general interests is why and how superconductivity often emerges near the boundary between the strong coupling, local and weak coupling, Fermi-liquid like regimes with the cooperation of enhanced non-Fermi liquid physics. We will discuss several newly developed theories for the non-Fermi liquid or strange metal physics without tuning the materials to a quantum critical point. Intermediate coupling (where electronic interaction strength is of the order of bandwidth) models for correlated superconductors, recently observed charge density wave, pair density wave, nematic order for superconductivity, and others will be discussed and confronted with experiments. Given the diversity and versatility of the field, focussed and well-defined problems will be identified where collaborations between experiment and theory can be built and strengthened.

More details will be added as they become available.

 



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