Recent progress in NMR studies on unconventional super-conductors
Nuclear magnetic resonance(NMR)is a crucial research tool in spectroscopy,specifically for exploring the mechanisms of unconventional superconductors.The discovery of new unconventional superconducting materials has facilitated several new developments in the field of nuclear magnetic resonance in recent years.These advancements have aided and accelerated the study of unconventional superconductivity mechanisms.This article presents a comprehensive overview of the latest research and its categorization into three types of superconducting materials:odd-parity superconductors,copper-oxide high-temperature superconductors and kagome superconductors.Our study of odd-parity superconductors will focus on the superconducting phase diagram on the paramagnetic side of the ferromagnetic quantum critical point in the chromium-based superconducting family A2Cr3As3 and the experimental evidence for spin-triplet superconductivity.Moreover,we will present the results on antiferromagnetic spin fluctuations and the mixed state of spin-singlet and spin-triplet pairing in the noncentrosymmetric superconductor YPtBi.For cuprate and kagome-structured superconductors,we will present the microscopic experimental evidence for the commensurate λ=3b periodicity charge density wave modulation induced by strong magnetic fields in YBa2Cu3Oy.Furthermore,we will also discuss the evolution of charge density wave modulation and electronic correlations with varying pressure in the kagome superconductor CsV3Sb5.We hope this study can provide some insights and stimulate further theoretical,material and experimental research in the realm of unconventional superconductors.
unconventional superconductorsnuclear magnetic resonanceodd-parity superconductorcharge orderkagome superconductors
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