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In-plane anisotropic magnetoresistance in detwinned BaFe2-xNixAs2 (x = 0, 0.6)

Journal Article · · Physical Review. B
 [1];  [2];  [3];  [3];  [4];  [5];  [2];  [3];  [2]
  1. Rice University, Houston, TX (United States); Florida State University
  2. Rice University, Houston, TX (United States)
  3. Florida State University, Tallahassee, FL (United States)
  4. Argonne National Laboratory (ANL), Argonne, IL (United States)
  5. Max Planck Institute for Solid State Research, Stuttgart (Germany)
+ Show Author Affiliations
Understanding the magnetoresistance (MR) of a magnetic material forms the basis for uncovering the orbital mechanisms and charge-spin interactions in the system. Although the parent state of iron-based high-temperature superconductors, including BaFe2As2, exhibits unusual electron transport properties resulting from spin and charge correlations, there is still valuable insight to be gained by understanding the in-plane MR effect due to twin domains in the orthorhombic antiferromagnetic ordered state. Here, we study the in-plane magnetoresistance anisotropy in detwinned BaFe2As2 and compare the results to the nonmagnetic Ni-doped sample. We find that in the antiferromagnetically ordered state, BaFe2As2 exhibits anisotropic MR that becomes large at low temperatures and high fields. Both transverse and longitudinal MRs are highly anisotropic and dependent on the field and current orientations. Furthermore, these results cannot be fully explained by calculations considering only the anisotropic Fermi surface. Instead, the spin orientation of the ordered moment also affects the MR effect, suggesting the presence of a large charge-spin interaction in BaFe2As2 that is not present in the Ni-doped material.
Research Organization:
Argonne National Laboratory (ANL), Argonne, IL (United States); Florida State University, Tallahassee, FL (United States)
Sponsoring Organization:
National Science Foundation (NSF); Robert A. Welch Foundation; USDOE Office of Science (SC), Basic Energy Sciences (BES)
Grant/Contract Number:
AC02-06CH11357; SC0002613; SC0012311
OSTI ID:
2317799
Alternate ID(s):
OSTI ID: 2441303
OSTI ID: 2473862
Journal Information:
Physical Review. B, Journal Name: Physical Review. B Journal Issue: 5 Vol. 109; ISSN 2469-9950
Publisher:
American Physical Society (APS)Copyright Statement
Country of Publication:
United States
Language:
English

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36 MATERIALS SCIENCE
Anisotropic magnetoresistance
Density functional calculations
Iron-based superconductors
Magnetic anisotropy
Magnetoresistance
Resistivity measurements