Optical and photoemission investigation of structural and magnetic transitions in the iron-based superconductor Sr0.67Na0.33Fe2As2

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.

doi:10.1103/PhysRevB.100.235132

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

Journal Article · Fri Dec 20 00:00:00 EST 2019 · Physical Review B

DOI:https://doi.org/10.1103/PhysRevB.100.235132· OSTI ID:1579492

Yang, R. ^[1]; Huang, J. W. ^[2]; Zaki, N. ^[3]; Pletikosić, I. ^[4]; Dai, Y. M. ^[5];

^[6];

^[3]; Johnson, P. D. ^[3]; Zhou, X. J. ^[7]; Qiu, X. G. ^[8];

^[3]

Brookhaven National Lab. (BNL), Upton, NY (United States); Chinese Academy of Sciences (CAS), Beijing (China). Inst. of Physics
Chinese Academy of Sciences (CAS), Beijing (China). Inst. of Physics
Brookhaven National Lab. (BNL), Upton, NY (United States)
Brookhaven National Lab. (BNL), Upton, NY (United States); Princeton Univ., NJ (United States). Dept. of Physics
Nanjing Univ. (China). Center for Superconducting Physics and Materials, National Lab. of Solid State Microstructures and Dept. of Physics
Center for High Pressure Science and Technology Advanced Research, Beijing (China)
Chinese Academy of Sciences (CAS), Beijing (China). Inst. of Physics; Songshan Lake Materials Lab., Dongguan (China)
Chinese Academy of Sciences (CAS), Beijing (China). Inst. of Physics; Songshan Lake Materials Lab., Dongguan (China); Beijing Academy of Quantum Information Science, Beijing (China)

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.

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Research Organization:: Brookhaven National Lab. (BNL), Upton, NY (United States)

Sponsoring Organization:: USDOE Office of Science (SC), Basic Energy Sciences (BES)

Grant/Contract Number:: SC0012704

OSTI ID:: 1579492

Report Number(s):: BNL-212401-2019-JAAM; PRBMDO; TRN: US2102249

Journal Information:: Physical Review B, Vol. 100, Issue 23; ISSN 2469-9950

Publisher:: American Physical Society (APS)Copyright Statement

Country of Publication:: United States

Language:: English

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Cited by: 3 works

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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

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