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FFLO phase finally identified by NMR at LNCMI

An exotic superconducting state, allowing the superconductivity to survive in exceptionally high magnetic fields, has been finally characterized at LNCMI, thanks to collaboration between Vesna Mitrovic from Brown University in Providence, LNCMI NMR team and their colleagues from the University of Tokyo. They have identified the first microscopic signature of an FFLO phase, the so-called Andreev bound states.

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Quantum-Critical Spin Dynamics in Quasi-One-Dimensional Antiferromagnets

Low-dimensional quantum antiferromagnets in a magnetic field are remarkable model systems for studying the field induced exotic phases, e.g., Bose-Einstein condensation [T. Giamarchi, C. Rüegg, and O. Tchernyshyov, Nature Phys. 4, 198 (2008)], and the related quantum critical points (QCPs) where the continuous quantum phase transition occurs at zero temperature. In the vicinity of QCPs the physics is complex but universal, i.e., insensitive to the microscopic properties of the system, and (...)

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Field-induced charge stripes in a high temperature superconductor

What happens when a superconductor is exposed to a strong magnetic field? Textbooks teach us that in type-II superconductors, vortices of the superconducting current define a hexagonal lattice of tubes into which the magnetic field penetrates. The higher the magnetic field, the larger the number of vortices and since each vortex core is a non-superconducting, so-called “normal”, region, superconductivity disappears once the cores overlap throughout the sample. In high temperature (...)

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A new type of magnetic crystal

NMR spectra in SrCu2(BO3)2 compound obtained at temperature of only 0.035 kelvins in the homogeneously magnetized phase at 26 teslas (shown in black and white) and in the "magnetization plateau" at 27.6 teslas (shown in color) are spectacularly different. The latter one enabled the determination of the structure of "magnetic crystal".

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