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

Meier, William R.; Ding, Qing-Ping; Kreyssig, Andreas; Bud’ko, Sergey L.; Sapkota, Aashish; Kothapalli, Karunakar; Borisov, Vladislav; Valentí, Roser; Batista, Cristian D.; Orth, Peter P.; Fernandes, Rafael M.; Goldman, Alan I.; Furukawa, Yuji; Böhmer, Anna E.; Canfield, Paul C.

doi:10.1038/s41535-017-0076-x

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

Journal Article · Fri Feb 09 00:00:00 EST 2018 · npj Quantum Materials

DOI:https://doi.org/10.1038/s41535-017-0076-x· OSTI ID:1422755

^[1];

^[1]; Kreyssig, Andreas ^[1]; Bud’ko, Sergey L. ^[1]; Sapkota, Aashish ^[1]; Kothapalli, Karunakar ^[1]; Borisov, Vladislav ^[2]; Valentí, Roser ^[2]; Batista, Cristian D. ^[3];

^[1]; Fernandes, Rafael M. ^[4]; Goldman, Alan I. ^[1]; Furukawa, Yuji ^[1];

^[5]; Canfield, Paul C. ^[1]

Ames Lab. and Iowa State Univ., Ames, IA (United States) and Dept. of Physics and Astronomy;
Goethe Univ., Frankfurt (Germany). Inst. of Theoretical Physics
Univ. of Tennessee, Knoxville, TN (United States). Dept. of Physics and Astronomy; Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States). Quantum Condensed Matter Division and Shull-Wollan Center
Univ. of Minnesota, Minneapolis, MN (United States). School of Physics and Astronomy
Ames Lab. and Iowa State Univ., Ames, IA (United States)

Magnetism is widely considered to be a key ingredient of unconventional superconductivity. In contrast to cuprate high-temperature superconductors, antiferromagnetism in most Fe-based superconductors (FeSCs) is characterized by a pair of magnetic propagation vectors, (π,0) and (0,π). Consequently, 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. The exotic SVC phase is stabilized by the reduced symmetry of the CaKFe₄As₄ structure. Thus, our results suggest that the possible magnetic ground states in FeSCs have very similar energies, providing an enlarged configuration space for magnetic fluctuations to promote high-temperature superconductivity.

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Research Organization:: Ames Laboratory (AMES), Ames, IA (United States)

Sponsoring Organization:: USDOE Office of Science (SC), Basic Energy Sciences (BES). Materials Sciences & Engineering Division; Gordon and Betty Moore Foundation; German Research Foundation (DFG); Iowa State University Research Foundation

Grant/Contract Number:: AC02-07CH11358; GBMF4411; AC02-06CH11357; SFB/TRR49; SC0012336

OSTI ID:: 1422755

Report Number(s):: IS-J-9515; PII: 76

Journal Information:: npj Quantum Materials, Vol. 3, Issue 1; ISSN 2397-4648

Publisher:: Nature Publishing GroupCopyright Statement

Country of Publication:: United States

Language:: English

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Cited by: 68 works

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