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Title: Competition between orthorhombic and re-entrant tetragonal phases in underdoped Ba 1 - x K x Fe 2 As 2 probed by the response to controlled disorder

Abstract

Low-temperature (22 K) irradiation with 2.5-MeV electrons, creating point defects affecting elastic scattering, was used to study the competition between stripe C-2 and tetragonal C-4 antiferromagnetic phases which exist in a narrow doping range around x = 0.25 in hole-doped Ba 1-xK xFe 2As2. In nearby compositions outside of this range, at x = 0.22 and x = 0.19, the temperatures of both the concomitant orthorhombic/stripe antiferromagnetic transition T-C2 and the superconducting transition T-c are monotonically suppressed by added disorder at similar rates of about 0.1 K/mu Ω cm, as revealed through using resistivity variation as an intrinsic measure of scattering rate. In a stark contrast, a rapid suppression of the C-4 phase at the rate of 0.24 K/mu Ω cm is found at x = 0.25. Moreover, this suppression of the C-4 phase is accompanied by unusual disorder-induced stabilization of the C-2 phase, determined by resistivity and specific heat measurements. The rate of the C-4 phase suppression is notably higher than the suppression rate of the spin-vortex phase in the Ni-doped CaKFe 4As 4 (0.16 K/mu Ω cm).

Authors:
; ; ; ; ; ; ; ; ; ;
Publication Date:
Research Org.:
Argonne National Lab. (ANL), Argonne, IL (United States)
Sponsoring Org.:
Swiss National Science Foundation (SNSF); USDOE Office of Science - Office of Basic Energy Sciences - Materials Sciences and Engineering Division
OSTI Identifier:
1503248
DOE Contract Number:  
AC02-06CH11357
Resource Type:
Journal Article
Journal Name:
Physical Review B
Additional Journal Information:
Journal Volume: 99; Journal Issue: 5; Journal ID: ISSN 2469-9950
Publisher:
American Physical Society (APS)
Country of Publication:
United States
Language:
English

Citation Formats

Timmons, E. I., Tanatar, M. A., Willa, K., Teknowijoyo, S., Cho, Kyuil, Kończykowski, M., Cavani, O., Liu, Yong, Lograsso, T. A., Welp, U., and Prozorov, R. Competition between orthorhombic and re-entrant tetragonal phases in underdoped Ba1-xKxFe2As2 probed by the response to controlled disorder. United States: N. p., 2019. Web. doi:10.1103/PhysRevB.99.054518.
Timmons, E. I., Tanatar, M. A., Willa, K., Teknowijoyo, S., Cho, Kyuil, Kończykowski, M., Cavani, O., Liu, Yong, Lograsso, T. A., Welp, U., & Prozorov, R. Competition between orthorhombic and re-entrant tetragonal phases in underdoped Ba1-xKxFe2As2 probed by the response to controlled disorder. United States. doi:10.1103/PhysRevB.99.054518.
Timmons, E. I., Tanatar, M. A., Willa, K., Teknowijoyo, S., Cho, Kyuil, Kończykowski, M., Cavani, O., Liu, Yong, Lograsso, T. A., Welp, U., and Prozorov, R. Fri . "Competition between orthorhombic and re-entrant tetragonal phases in underdoped Ba1-xKxFe2As2 probed by the response to controlled disorder". United States. doi:10.1103/PhysRevB.99.054518.
@article{osti_1503248,
title = {Competition between orthorhombic and re-entrant tetragonal phases in underdoped Ba1-xKxFe2As2 probed by the response to controlled disorder},
author = {Timmons, E. I. and Tanatar, M. A. and Willa, K. and Teknowijoyo, S. and Cho, Kyuil and Kończykowski, M. and Cavani, O. and Liu, Yong and Lograsso, T. A. and Welp, U. and Prozorov, R.},
abstractNote = {Low-temperature (22 K) irradiation with 2.5-MeV electrons, creating point defects affecting elastic scattering, was used to study the competition between stripe C-2 and tetragonal C-4 antiferromagnetic phases which exist in a narrow doping range around x = 0.25 in hole-doped Ba1-xKxFe2As2. In nearby compositions outside of this range, at x = 0.22 and x = 0.19, the temperatures of both the concomitant orthorhombic/stripe antiferromagnetic transition T-C2 and the superconducting transition T-c are monotonically suppressed by added disorder at similar rates of about 0.1 K/mu Ω cm, as revealed through using resistivity variation as an intrinsic measure of scattering rate. In a stark contrast, a rapid suppression of the C-4 phase at the rate of 0.24 K/mu Ω cm is found at x = 0.25. Moreover, this suppression of the C-4 phase is accompanied by unusual disorder-induced stabilization of the C-2 phase, determined by resistivity and specific heat measurements. The rate of the C-4 phase suppression is notably higher than the suppression rate of the spin-vortex phase in the Ni-doped CaKFe4As4 (0.16 K/mu Ω cm).},
doi = {10.1103/PhysRevB.99.054518},
journal = {Physical Review B},
issn = {2469-9950},
number = 5,
volume = 99,
place = {United States},
year = {2019},
month = {2}
}

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