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Title: Competition between orthorhombic and re-entrant tetragonal phases in underdoped Ba 1–xK xFe 2As 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 2As 2. 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/ μΩcm, 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/ μΩcm 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. Furthermore, 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/ μΩcm).

Authors:
 [1];  [1];  [2];  [1];  [3];  [4];  [4];  [3];  [1];  [2];  [1]
  1. Ames Lab., Ames, IA (United States); Iowa State Univ., Ames, IA (United States)
  2. Argonne National Lab. (ANL), Argonne, IL (United States)
  3. Ames Lab., Ames, IA (United States)
  4. Univ. Paris-Saclay, Palaiseau Cedex (France)
Publication Date:
Research Org.:
Ames Laboratory (AMES), Ames, IA (United States)
Sponsoring Org.:
USDOE
OSTI Identifier:
1514995
Alternate Identifier(s):
OSTI ID: 1546148
Report Number(s):
IS-J-9898
Journal ID: ISSN 2469-9950; PRBMDO
Grant/Contract Number:  
AC02-07CH11358
Resource Type:
Accepted Manuscript
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. Tue . "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_1514995,
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 C2 and tetragonal C4 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 TC2 and the superconducting transition Tc are monotonically suppressed by added disorder at similar rates of about 0.1 K/μΩcm, as revealed through using resistivity variation as an intrinsic measure of scattering rate. In a stark contrast, a rapid suppression of the C4 phase at the rate of 0.24 K/μΩcm is found at x = 0.25. Moreover, this suppression of the C4 phase is accompanied by unusual disorder-induced stabilization of the C2 phase, determined by resistivity and specific heat measurements. Furthermore, the rate of the C4 phase suppression is notably higher than the suppression rate of the spin-vortex phase in the Ni-doped CaKFe4As4 (0.16 K/μΩcm).},
doi = {10.1103/PhysRevB.99.054518},
journal = {Physical Review B},
number = 5,
volume = 99,
place = {United States},
year = {2019},
month = {2}
}

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This content will become publicly available on February 26, 2020
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