Hedgehog spin-vortex crystal stabilized in a hole-doped iron-based superconductor

Scientists at the U.S. Department of Energy’s Ames Laboratory have discovered a state of magnetism that helps in the understanding of the relationships between magnetism and unconventional superconductivity. Doping Iron(Fe) with cobalt and nickel slightly distorted the atomic arrangements which induced the new magnetic order(spin-vortex crystal (SVC) ) while retaining its superconducting properties.

 

Three different types of magnetic order are possible. Of these, only stripe-type spin-density wave (SSDW) and spin-charge-density wave (SCDW) orders have been observed. A realization of the proposed spin-vortex crystal (SVC) order is noticeably absent. We report a magnetic phase consistent with the hedgehog variation of SVC order in Ni-doped and Co-doped CaKFe4As4 based on thermodynamic, transport, structural and local magnetic probes combined with symmetry analysis.

Authors: William R. Meier, Qing-Ping Ding, Andreas Kreyssig, Sergey L. Bud’ko, Aashish Sapkota, Karunakar Kothapalli, Vladislav Borisov, Roser Valentí, Cristian D. Batista, Peter P. Orth, Rafael M. Fernandes, Alan I. Goldman, Yuji Furukawa, Anna E. Böhmer & Paul C. Canfield
npj Quantum Materialsvolume 3, Article number: 5 (2018)
doi:10.1038/s41535-017-0076-x

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Hedgehog spin-vortex crystal stabilized in a hole-doped iron-based superconductor

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