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Title: Suppression of magnetic order in CaCo 1.86 As 2 with Fe substitution: Magnetization, neutron diffraction, and x-ray diffraction studies of Ca ( Co 1 x Fe x ) y As 2

Abstract

Magnetization, neutron diffraction, and high-energy x-ray diffraction results for Sn-flux grown single-crystal samples of Ca(Co 1–xFe x) yAs 2, 0 ≤ x ≤ 1, 1.86 ≤ y ≤ 2, are presented and reveal that A-type antiferromagnetic order, with ordered moments lying along the c axis, persists for x ≲ 0.12(1). The antiferromagnetic order is smoothly suppressed with increasing x, with both the ordered moment and Néel temperature linearly decreasing. Stripe-type antiferromagnetic order does not occur for x ≤ 0.25, nor does ferromagnetic order for x up to at least x = 0.104, and a smooth crossover from the collapsed-tetragonal (cT) phase of CaCo 1.86As 2 to the tetragonal (T) phase of CaFe 2As 2 occurs. Furthermore, these results suggest that hole doping CaCo 1.86As 2 has a less dramatic effect on the magnetism and structure than steric effects due to substituting Sr for Ca.

Authors:
 [1];  [2];  [1];  [1];  [1];  [1];  [3];  [4];  [1];  [1];  [1];  [1];  [1]
  1. Ames Lab. and Iowa State Univ., Ames, IA (United States)
  2. Ames Lab. and Iowa State Univ., Ames, IA (United States); Texas A & M Univ., College Station, TX (United States)
  3. Ames Lab. and Iowa State Univ., Ames, IA (United States); Helmholtz-Zentrum Berlin fur Materialien und Energie GmbH, Berlin (Germany)
  4. Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
Publication Date:
Research Org.:
Ames Laboratory (AMES), Ames, IA (United States)
Sponsoring Org.:
USDOE
OSTI Identifier:
1347399
Alternate Identifier(s):
OSTI ID: 1344816
Report Number(s):
IS-J-9213
Journal ID: ISSN 2469-9950; PRBMDO; TRN: US1700689
Grant/Contract Number:  
AC02-07CH11358; AC02-06CH11357
Resource Type:
Journal Article: Accepted Manuscript
Journal Name:
Physical Review B
Additional Journal Information:
Journal Volume: 95; Journal Issue: 6; Journal ID: ISSN 2469-9950
Publisher:
American Physical Society (APS)
Country of Publication:
United States
Language:
English
Subject:
75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY

Citation Formats

Jayasekara, W. T., Pandey, Abhishek, Kreyssig, A., Sangeetha, N. S., Sapkota, A., Kothapalli, K., Anand, V. K., Tian, W., Vaknin, D., Johnston, D. C., McQueeney, R. J., Goldman, A. I., and Ueland, B. G.. Suppression of magnetic order in CaCo1.86As2 with Fe substitution: Magnetization, neutron diffraction, and x-ray diffraction studies of Ca(Co1–xFex)yAs2. United States: N. p., 2017. Web. doi:10.1103/PhysRevB.95.064425.
Jayasekara, W. T., Pandey, Abhishek, Kreyssig, A., Sangeetha, N. S., Sapkota, A., Kothapalli, K., Anand, V. K., Tian, W., Vaknin, D., Johnston, D. C., McQueeney, R. J., Goldman, A. I., & Ueland, B. G.. Suppression of magnetic order in CaCo1.86As2 with Fe substitution: Magnetization, neutron diffraction, and x-ray diffraction studies of Ca(Co1–xFex)yAs2. United States. doi:10.1103/PhysRevB.95.064425.
Jayasekara, W. T., Pandey, Abhishek, Kreyssig, A., Sangeetha, N. S., Sapkota, A., Kothapalli, K., Anand, V. K., Tian, W., Vaknin, D., Johnston, D. C., McQueeney, R. J., Goldman, A. I., and Ueland, B. G.. Thu . "Suppression of magnetic order in CaCo1.86As2 with Fe substitution: Magnetization, neutron diffraction, and x-ray diffraction studies of Ca(Co1–xFex)yAs2". United States. doi:10.1103/PhysRevB.95.064425. https://www.osti.gov/servlets/purl/1347399.
@article{osti_1347399,
title = {Suppression of magnetic order in CaCo1.86As2 with Fe substitution: Magnetization, neutron diffraction, and x-ray diffraction studies of Ca(Co1–xFex)yAs2},
author = {Jayasekara, W. T. and Pandey, Abhishek and Kreyssig, A. and Sangeetha, N. S. and Sapkota, A. and Kothapalli, K. and Anand, V. K. and Tian, W. and Vaknin, D. and Johnston, D. C. and McQueeney, R. J. and Goldman, A. I. and Ueland, B. G.},
abstractNote = {Magnetization, neutron diffraction, and high-energy x-ray diffraction results for Sn-flux grown single-crystal samples of Ca(Co1–xFex)yAs2, 0 ≤ x ≤ 1, 1.86 ≤ y ≤ 2, are presented and reveal that A-type antiferromagnetic order, with ordered moments lying along the c axis, persists for x ≲ 0.12(1). The antiferromagnetic order is smoothly suppressed with increasing x, with both the ordered moment and Néel temperature linearly decreasing. Stripe-type antiferromagnetic order does not occur for x ≤ 0.25, nor does ferromagnetic order for x up to at least x = 0.104, and a smooth crossover from the collapsed-tetragonal (cT) phase of CaCo1.86As2 to the tetragonal (T) phase of CaFe2As2 occurs. Furthermore, these results suggest that hole doping CaCo1.86As2 has a less dramatic effect on the magnetism and structure than steric effects due to substituting Sr for Ca.},
doi = {10.1103/PhysRevB.95.064425},
journal = {Physical Review B},
number = 6,
volume = 95,
place = {United States},
year = {Thu Feb 23 00:00:00 EST 2017},
month = {Thu Feb 23 00:00:00 EST 2017}
}

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