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

Abstract

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.

Authors:
ORCiD logo [1]; ORCiD logo [1];  [1];  [1];  [1];  [1];  [2];  [2];  [3]; ORCiD logo [1];  [4];  [1];  [1]; ORCiD logo [5];  [1]
  1. Ames Lab. and Iowa State Univ., Ames, IA (United States) and Dept. of Physics and Astronomy;
  2. Goethe Univ., Frankfurt (Germany). Inst. of Theoretical Physics
  3. 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
  4. Univ. of Minnesota, Minneapolis, MN (United States). School of Physics and Astronomy
  5. Ames Lab. and Iowa State Univ., Ames, IA (United States)
Publication Date:
Research Org.:
Ames Lab., Ames, IA (United States)
Sponsoring Org.:
USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22). Materials Sciences & Engineering Division; Gordon and Betty Moore Foundation; Argonne National Lab. (ANL), Argonne, IL (United States). Advanced Photon Source (APS); German Research Foundation (DFG); Iowa State University Research Foundation
OSTI Identifier:
1422755
Report Number(s):
IS-J-9515
Journal ID: ISSN 2397-4648; PII: 76
Grant/Contract Number:  
AC02-07CH11358; GBMF4411; AC02-06CH11357; SFB/TRR49; SC0012336
Resource Type:
Accepted Manuscript
Journal Name:
npj Quantum Materials
Additional Journal Information:
Journal Volume: 3; Journal Issue: 1; Journal ID: ISSN 2397-4648
Publisher:
Nature Publishing Group
Country of Publication:
United States
Language:
English
Subject:
75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY; Magnetic properties and materials; Superconducting properties and materials

Citation Formats

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., and Canfield, Paul C. Hedgehog spin-vortex crystal stabilized in a hole-doped iron-based superconductor. United States: N. p., 2018. Web. https://doi.org/10.1038/s41535-017-0076-x.
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. Hedgehog spin-vortex crystal stabilized in a hole-doped iron-based superconductor. United States. https://doi.org/10.1038/s41535-017-0076-x
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., and Canfield, Paul C. Fri . "Hedgehog spin-vortex crystal stabilized in a hole-doped iron-based superconductor". United States. https://doi.org/10.1038/s41535-017-0076-x. https://www.osti.gov/servlets/purl/1422755.
@article{osti_1422755,
title = {Hedgehog spin-vortex crystal stabilized in a hole-doped iron-based superconductor},
author = {Meier, William R. and Ding, Qing-Ping and Kreyssig, Andreas and Bud’ko, Sergey L. and Sapkota, Aashish and Kothapalli, Karunakar and Borisov, Vladislav and Valentí, Roser and Batista, Cristian D. and Orth, Peter P. and Fernandes, Rafael M. and Goldman, Alan I. and Furukawa, Yuji and Böhmer, Anna E. and Canfield, Paul C.},
abstractNote = {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.},
doi = {10.1038/s41535-017-0076-x},
journal = {npj Quantum Materials},
number = 1,
volume = 3,
place = {United States},
year = {2018},
month = {2}
}

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