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

doi:https://doi.org/10.1103/PhysRevB.88.241111

Title: Metal-insulator transition in antiferromagnetic Ba $_{1 - x}$ K $_{x}$ Mn $_{2}$ As $_{2}$ ( $0 \leq x \leq 0.4$ ) single crystals studied by $^{55}$ Mn and $^{75}$ As NMR

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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:: Yeninas, S.; Pandey, Abhishek; Ogloblichev, V.; Mikhalev, K.; Johnston, D. C.; Furukawa, Y.

Publication Date:: 2013-12-23

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.

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                    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

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                    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.

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@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}

}

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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

Citation Formats

Title: Metal-insulator transition in antiferromagnetic Ba $_{1 - x}$ K $_{x}$ Mn $_{2}$ As $_{2}$ ( $0 \leq x \leq 0.4$ ) single crystals studied by $^{55}$ Mn and $^{75}$ As NMR