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Title: Metal-insulator transition in antiferromagnetic Ba 1 - x K x Mn 2 As 2 ( 0 x 0.4 ) single crystals studied by 55 Mn and 75 As NMR

Abstract

The magnetic structure and metal-insulator transition in antiferromagnetic (AFM) BaMn 2As 2 and Ba 1-xK xMn 2As 2 single crystals have been investigated by 55Mn and 75As nuclear magnetic resonance (NMR) measurements. In the parent AFM insulator BaMn 2As 2 with a Néel temperature TN=625 K, we observed a 55Mn zero-field NMR (ZFNMR) spectrum and confirmed the G-type AFM structure from the field dependence of the 55Mn spectra and 75As NMR spectra below TN. In hole-doped crystals with x>0.01, similar 55Mn ZFNMR spectra were observed and the AFM state was revealed to be robust up to x=0.4 with the ordered moment nearly independent of x. The nuclear spin-lattice relaxation rates (1/T 1) for both nuclei in the doped samples follow the Korringa relation T 1T=const, indicating a metallic state. This confirms the coexistence of AFM ordered localized Mn spins and conduction carriers from a microscopic point of view. From the x dependence of (T 1T) -1/2 for both nuclei, we conclude that this transition is caused by vanishing of the hole concentration as the transition is approached from the metallic side.

Authors:
; ; ; ; ;
Publication Date:
Research Org.:
Ames Laboratory (AMES), Ames, IA (United States)
Sponsoring Org.:
USDOE Office of Science (SC)
OSTI Identifier:
1134208
Report Number(s):
IS-J 8221
Journal ID: ISSN 1098-0121; PRBMDO
DOE Contract Number:  
AC02-07CH11358
Resource Type:
Journal Article
Journal Name:
Physical Review. B, Condensed Matter and Materials Physics
Additional Journal Information:
Journal Volume: 88; Journal Issue: 24; Journal ID: ISSN 1098-0121
Publisher:
American Physical Society (APS)
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE

Citation Formats

Yeninas, S., Pandey, Abhishek, Ogloblichev, V., Mikhalev, K., Johnston, D. C., and Furukawa, Y. Metal-insulator transition in antiferromagnetic Ba 1-x K x Mn 2 As 2 ( 0≤x≤0.4 ) single crystals studied by 55 Mn and 75 As NMR. United States: N. p., 2013. Web. doi:10.1103/PhysRevB.88.241111.
Yeninas, S., Pandey, Abhishek, Ogloblichev, V., Mikhalev, K., Johnston, D. C., & Furukawa, Y. Metal-insulator transition in antiferromagnetic Ba 1-x K x Mn 2 As 2 ( 0≤x≤0.4 ) single crystals studied by 55 Mn and 75 As NMR. United States. https://doi.org/10.1103/PhysRevB.88.241111
Yeninas, S., Pandey, Abhishek, Ogloblichev, V., Mikhalev, K., Johnston, D. C., and Furukawa, Y. Mon . "Metal-insulator transition in antiferromagnetic Ba 1-x K x Mn 2 As 2 ( 0≤x≤0.4 ) single crystals studied by 55 Mn and 75 As NMR". United States. https://doi.org/10.1103/PhysRevB.88.241111.
@article{osti_1134208,
title = {Metal-insulator transition in antiferromagnetic Ba 1-x K x Mn 2 As 2 ( 0≤x≤0.4 ) single crystals studied by 55 Mn and 75 As NMR},
author = {Yeninas, S. and Pandey, Abhishek and Ogloblichev, V. and Mikhalev, K. and Johnston, D. C. and Furukawa, Y.},
abstractNote = {The magnetic structure and metal-insulator transition in antiferromagnetic (AFM) BaMn2As2 and Ba1-xKxMn2As2 single crystals have been investigated by 55Mn and 75As nuclear magnetic resonance (NMR) measurements. In the parent AFM insulator BaMn2As2 with a Néel temperature TN=625 K, we observed a 55Mn zero-field NMR (ZFNMR) spectrum and confirmed the G-type AFM structure from the field dependence of the 55Mn spectra and 75As NMR spectra below TN. In hole-doped crystals with x>0.01, similar 55Mn ZFNMR spectra were observed and the AFM state was revealed to be robust up to x=0.4 with the ordered moment nearly independent of x. The nuclear spin-lattice relaxation rates (1/T1) for both nuclei in the doped samples follow the Korringa relation T1T=const, indicating a metallic state. This confirms the coexistence of AFM ordered localized Mn spins and conduction carriers from a microscopic point of view. From the x dependence of (T1T)-1/2 for both nuclei, we conclude that this transition is caused by vanishing of the hole concentration as the transition is approached from the metallic side.},
doi = {10.1103/PhysRevB.88.241111},
url = {https://www.osti.gov/biblio/1134208}, journal = {Physical Review. B, Condensed Matter and Materials Physics},
issn = {1098-0121},
number = 24,
volume = 88,
place = {United States},
year = {2013},
month = {12}
}