Significant enhancement of upper critical fields by doping and strain in iron-based superconductors

2011/08/31 by C. Tarantini, A. Gurevich, J. Jaroszynski +11 · 4 citations
Business, Management and Accounting · Materials Science · Physics and Astronomy · #Biology #Condensed matter physics #Corporate Taxation and Avoidance #Doping #Iron-based superconductor #Iron-based superconductors research #Materials science #Physics #Strain (injury) #Superconductivity #cond-mat.mtrl-sci #cond-mat.supr-con

paper · pdf · doi:10.1103/physrevb.84.184522

published as Physical Review B 84, 184522 (2011) · Accepted for publication in Physical Review B

arxiv created 2011/10/21 · openalex publication_date 2011/11/17 · arxiv updated 2011/11/18 · openalex created_date 2016/06/24 · openalex updated_date 2026/08/05

Abstract

We report measurements up to 85 Tesla of the upper critical fields H_c2(T) on Ba_1\ensuremath-xK_xAs₂Fe₂ single crystals and FeSe_1\ensuremath-xTe_x films tuned by doping and strain. We observed an H_c2 enhancement by more than 25 T at low temperatures for the optimally doped Ba_1\ensuremath-xK_xAs₂Fe₂ as compared to the previous measurements and extraordinarily high slopes of dH_c2/dT = 250--500 T/K near T_c in FeSe_1\ensuremath-xTe_x, indicating almost-complete suppression of orbital pair breaking. Theoretical analysis of H_c2(T) suggests an inhomogeneous Fulde-Ferrel-Larkin-Ovchinnikov state below 10K for H//ab in the optimally doped Ba_1\ensuremath-xK_xAs₂Fe₂ and below 3K for H//c and 9K for H//ab in FeSe_1\ensuremath-xTe_x. The analysis also shows that H_c2 in a multiband Fe-based superconductor can be significantly enhanced by doping and strain by shrinking and expanding different pockets of the Fermi surface, which can be more effective than the conventional way of increasing H_c2 by nonmagnetic impurities.

Citations

• Small anisotropy, weak thermal fluctuations, and high field superconductivity in Co-doped iron pnictide Ba(Fe1−xCox)2As2
• The puzzle of high temperature superconductivity in layered iron pnictides and chalcogenides
• Electronic structure of optimally doped pnictide Ba0.6K0.4Fe2As2: a comprehensive angle-resolved photoemission spectroscopy investigation
• Observation of Fermi-surface–dependent nodeless superconducting gaps in Ba 0.6 K 0.4 Fe 2 As 2
• Electronic structure ofFe1.04Te0.66Se0.34
• High-temperature superconductivity in iron-based materials

Cited by

• Development of very high Jc in Ba(Fe1-xCox)2As2 thin films grown on CaF2
• Universal scaling behavior of the upper critical field in strained FeSe0.7Te0.3 thin films
• Multiple phase transitions in Pauli-limited iron-based superconductors
• BaFe 2 (As 1− x P x ) 2 ( x = 0.22−0.42) thin films grown on practical metal–tape substrates and their critical current densities

Related

• Doping evolution of the anisotropic upper critical fields in iron-based superconductor Ba_1-xK_xFe₂As₂
• Novel Increase of Superconducting Critical Temperature of an Iron-Superconductor due to Ion Implantation
• Magneto-elastically coupled structural, magnetic and superconducting order parameters in BaFe₂(As_1-xP_x)₂
• Drastic suppression of superconducting T_c by anisotropic strain near a nematic quantum critical point
• Uniaxial-Strain Tuning of the Intertwined Orders in BaFe₂(As_1-xP_x)₂