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Title: Optical and photoemission investigation of structural and magnetic transitions in the iron-based superconductor Sr 0.67 Na 0.33 Fe 2 As 2

Abstract

We report the temperature-dependent optical conductivity and angle-resolved photoemission spectroscopy (ARPES) studies of the multiband iron-based superconductor Sr 0.67 Na 0.33 Fe 2 As 2 . Measurements were made in the high-temperature tetragonal paramagnetic phase, below the structural and magnetic transitions at $$T_N$$ $≃$ 125 K in the orthorhombic spin-density-wave (SDW)-like phase and $$T_r$$ $≃$42 K in the reentrant tetragonal double-Q magnetic phase where both charge and SDWorder exist, and below the superconducting transition at $$T_c$$ $≃$ 10 K. The free-carrier component in the optical conductivity is described by two Drude contributions: one strong and broad and the other weak and narrow. The broad Drude component decreases dramatically below TN and Tr , with much of its strength being transferred to a bound excitation in the midinfrared, while the narrow Drude component shows no anomalies at either of the transitions, actually increasing in strength at low temperature while narrowing dramatically. The behavior of an infrared-active mode suggests zone folding below Tr. Below Tc the dramatic decrease in the low-frequency optical conductivity signals the formation of a superconducting energy gap. ARPES reveals holelike bands at the center of the Brillouin zone (BZ), with both electron- and holelike bands at the corners. Below $$T_N$$, the hole pockets at the center of the BZ decrease in size, consistent with the behavior of the broad Drude component; however, below $$T_r$$ the electronlike bands shift and split, giving rise to a low-energy excitation in the optical conductivity at $≃$20 meV. The $$C_2$$ and $$C_4$$ magnetic states, with resulting spin-density-wave and charge-SDW order, respectively, lead to a significant reconstruction of the Fermi surface that has profound implications for the transport originating from the electron and hole pockets but appears to have relatively little impact on the superconductivity in this material.

Authors:
 [1];  [2];  [3];  [4];  [5]; ORCiD logo [6]; ORCiD logo [3];  [3];  [7];  [8]; ORCiD logo [3]
  1. Brookhaven National Lab. (BNL), Upton, NY (United States); Chinese Academy of Sciences (CAS), Beijing (China). Inst. of Physics
  2. Chinese Academy of Sciences (CAS), Beijing (China). Inst. of Physics
  3. Brookhaven National Lab. (BNL), Upton, NY (United States)
  4. Brookhaven National Lab. (BNL), Upton, NY (United States); Princeton Univ., NJ (United States). Dept. of Physics
  5. Nanjing Univ. (China). Center for Superconducting Physics and Materials, National Lab. of Solid State Microstructures and Dept. of Physics
  6. Center for High Pressure Science and Technology Advanced Research, Beijing (China)
  7. Chinese Academy of Sciences (CAS), Beijing (China). Inst. of Physics; Songshan Lake Materials Lab., Dongguan (China)
  8. Chinese Academy of Sciences (CAS), Beijing (China). Inst. of Physics; Songshan Lake Materials Lab., Dongguan (China); Beijing Academy of Quantum Information Science, Beijing (China)
Publication Date:
Research Org.:
Brookhaven National Lab. (BNL), Upton, NY (United States)
Sponsoring Org.:
USDOE Office of Science (SC), Basic Energy Sciences (BES)
OSTI Identifier:
1579492
Report Number(s):
BNL-212401-2019-JAAM
Journal ID: ISSN 2469-9950; PRBMDO
Grant/Contract Number:  
SC0012704
Resource Type:
Accepted Manuscript
Journal Name:
Physical Review B
Additional Journal Information:
Journal Volume: 100; Journal Issue: 23; Journal ID: ISSN 2469-9950
Publisher:
American Physical Society (APS)
Country of Publication:
United States
Language:
English
Subject:
75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY; Electrical conductivity; Electronic structure; Optical conductivity; Optical phonons; Penetration depth

Citation Formats

Yang, R., Huang, J. W., Zaki, N., Pletikosić, I., Dai, Y. M., Xiao, H., Valla, T., Johnson, P. D., Zhou, X. J., Qiu, X. G., and Homes, C. C. Optical and photoemission investigation of structural and magnetic transitions in the iron-based superconductor Sr0.67Na0.33Fe2As2. United States: N. p., 2019. Web. doi:10.1103/PhysRevB.100.235132.
Yang, R., Huang, J. W., Zaki, N., Pletikosić, I., Dai, Y. M., Xiao, H., Valla, T., Johnson, P. D., Zhou, X. J., Qiu, X. G., & Homes, C. C. Optical and photoemission investigation of structural and magnetic transitions in the iron-based superconductor Sr0.67Na0.33Fe2As2. United States. doi:10.1103/PhysRevB.100.235132.
Yang, R., Huang, J. W., Zaki, N., Pletikosić, I., Dai, Y. M., Xiao, H., Valla, T., Johnson, P. D., Zhou, X. J., Qiu, X. G., and Homes, C. C. Fri . "Optical and photoemission investigation of structural and magnetic transitions in the iron-based superconductor Sr0.67Na0.33Fe2As2". United States. doi:10.1103/PhysRevB.100.235132. https://www.osti.gov/servlets/purl/1579492.
@article{osti_1579492,
title = {Optical and photoemission investigation of structural and magnetic transitions in the iron-based superconductor Sr0.67Na0.33Fe2As2},
author = {Yang, R. and Huang, J. W. and Zaki, N. and Pletikosić, I. and Dai, Y. M. and Xiao, H. and Valla, T. and Johnson, P. D. and Zhou, X. J. and Qiu, X. G. and Homes, C. C.},
abstractNote = {We report the temperature-dependent optical conductivity and angle-resolved photoemission spectroscopy (ARPES) studies of the multiband iron-based superconductor Sr0.67Na0.33Fe2As2. Measurements were made in the high-temperature tetragonal paramagnetic phase, below the structural and magnetic transitions at $T_N$ $≃$ 125 K in the orthorhombic spin-density-wave (SDW)-like phase and $T_r$ $≃$42 K in the reentrant tetragonal double-Q magnetic phase where both charge and SDWorder exist, and below the superconducting transition at $T_c$ $≃$ 10 K. The free-carrier component in the optical conductivity is described by two Drude contributions: one strong and broad and the other weak and narrow. The broad Drude component decreases dramatically below TN and Tr , with much of its strength being transferred to a bound excitation in the midinfrared, while the narrow Drude component shows no anomalies at either of the transitions, actually increasing in strength at low temperature while narrowing dramatically. The behavior of an infrared-active mode suggests zone folding below Tr. Below Tc the dramatic decrease in the low-frequency optical conductivity signals the formation of a superconducting energy gap. ARPES reveals holelike bands at the center of the Brillouin zone (BZ), with both electron- and holelike bands at the corners. Below $T_N$, the hole pockets at the center of the BZ decrease in size, consistent with the behavior of the broad Drude component; however, below $T_r$ the electronlike bands shift and split, giving rise to a low-energy excitation in the optical conductivity at $≃$20 meV. The $C_2$ and $C_4$ magnetic states, with resulting spin-density-wave and charge-SDW order, respectively, lead to a significant reconstruction of the Fermi surface that has profound implications for the transport originating from the electron and hole pockets but appears to have relatively little impact on the superconductivity in this material.},
doi = {10.1103/PhysRevB.100.235132},
journal = {Physical Review B},
number = 23,
volume = 100,
place = {United States},
year = {2019},
month = {12}
}

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