Interplane Resistivity of Underdoped Single Crystals (Ba₁₋ₓKₓ)Fe₂As₂ (0 ≤ x < 0.34)

Author

M. A. Tanatar
W. E. Straszheim
Hyunsoo Kim, Missouri University of Science and TechnologyFollow
J. Murphy
N. Spyrison
E. C. Blomberg
K. Cho
J. Ph Reid
Bing Shen
For full list of authors, see publisher's website.

Abstract

The temperature-dependent interplane resistivity ρ_c(T) was measured in the hole-doped iron arsenide superconductor (Ba_1-xK_x)Fe₂As₂ over a doping range from parent compound to optimal doping at T_c ≈ 38 K, 0 ≤ x ≤ 0.34. The measurements were undertaken on high-quality single crystals grown from FeAs flux. The coupled magnetic/structural transition at T_SM leads to a clear accelerated decrease of ρ_c(T) on cooling in samples with T_c < 26 K (x < 0.25). This decrease in the hole-doped material is in notable contrast to the increase in ρ_c(T) in the electron-doped Ba(Fe_1-xCo_x)Fe₂As₂ and isoelectron-substituted BaFe₂(As_1-xP_x)₂. T_SM decreases very sharply with doping, dropping from T_s = 71 K to zero on increase of T_c from approximately 25 to 27 K. ρ_c(T) becomes linear in T close to optimal doping. The broad crossover maximum in ρ_c(T), found in the parent BaFe₂As₂ at around T_max ∼ 200 K, shifts to higher temperature ∼250 K with doping of x = 0.34. The maximum shows clear correlation with the broad crossover feature found in the temperature-dependent in-plane resistivity ρ_a(T). The evolution with doping of T_max in (Ba_1-xK_x)Fe₂As₂ is in notable contrast with both the rapid suppression of T_max found in Ba(Fe_1-xT_x)₂As₂ (T = Co,Rh,Ni,Pd) and its rapid increase in BaFe₂(As_1-xP_x)₂. This observation suggests that pseudogap features are much stronger in hole-doped than in electron-doped iron-based superconductors, revealing significant electron-hole doping asymmetry similar to that in the cuprates.

Recommended Citation

M. A. Tanatar and W. E. Straszheim and H. Kim and J. Murphy and N. Spyrison and E. C. Blomberg and K. Cho and J. P. Reid and B. Shen and For full list of authors, see publisher's website., "Interplane Resistivity of Underdoped Single Crystals (Ba₁₋ₓKₓ)Fe₂As₂ (0 ≤ x < 0.34)," Physical Review B - Condensed Matter and Materials Physics, vol. 89, no. 14, article no. 144514, American Physical Society (APS), Apr 2014.

The definitive version is available at https://doi.org/10.1103/PhysRevB.89.144514

Department(s)

Physics

Comments

U.S. Department of Energy, Grant None

International Standard Serial Number (ISSN)

1550-235X; 1098-0121

Document Type

Article - Journal

Document Version

Citation

File Type

text

Language(s)

English

Rights

© 2014 American Physical Society (APS), All rights reserved.

Publication Date

30 Apr 2014