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Magnetic properties and NMR data of Rb2MnCl4, RbMnCl3. Kang, Byeongki 20110518. contents. Rb 2 MnCl 4 RbMnCl 3 Summary . Rb 2 MnCl 4. Structure tetragonal space group:I4/mmm(D4h17 ) a=5.05Å, c=16.18Å Magnetic properties Antiferromagnet T N : 55K Magnetic moment:4.4 μ B

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Magnetic properties and NMR data of Rb2MnCl4, RbMnCl3

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Magnetic properties and NMR data of Rb2MnCl4, RbMnCl3

Kang, Byeongki

20110518


contents

  • Rb2MnCl4

  • RbMnCl3

  • Summary


Rb2MnCl4

  • Structure

    • tetragonal space group:I4/mmm(D4h17)

    • a=5.05Å, c=16.18Å

  • Magnetic properties

    • Antiferromagnet

    • TN: 55K

    • Magnetic moment:4.4μB

    • Spin-flop: H>5.5T

Epstein et. Al., Phys. Rev. B, 2, 3703(1970)

H. Rauth et. al.,J. Phys. C: Solid State Phys. 19, 4503(1986)


NMR of Rb2MnCl4

  • 87Rb

    • I=3/2, γ=14.0MHz/T

    • Zero point freq.: 130.88MHz

  • 2 peaks

    • +1/2 <-> -1/2 transition

    • 2 sites of Rb

    • Frequency shift

      • dipole-dipole interaction

      • Transferred hyperfine interaction

    • Rb site local symmetry change at 350K

A. Lim, J. Appl. Phys. 106, 093522 (2009)


RbMnCl3

  • Structure:

    • Hexagonal structure

    • Space group: P6(3)/mmc

    • a=7.16Å, c=17.80Å

  • Magnetic properties

    • Antiferromagnet

    • TN=94.6K

    • External magnetic field

      • H//AFM: spin flip for > 6.3kOe

      • Arbitrary direction in ab plane: ┴AFM

T. Tsuda, JPSJ, 53, 3994(1984)

A. Lim, J. Appl. Phys., 91, 3095(2002)


NMR of RbMnCl3

  • Rb NMR

    • 2 Peaks

      • From 2 Rb sites

    • Spin-lattice Relaxation time

      • Abrupt change at TN

  • Mn NMR

    • 2 peaks

      • 4.2K: 624.2MHz, 585.7MHz

T. Tsuda, JPSJ, 53, 3994(1984)

A. Lim, J. Appl. Phys., 91, 3095(2002)


Summary

  • Rb2MnCl4

    • Tetragonal structure

    • Antiferromagnet TN=55K

    • Spin flop : 5.5T

    • Rb NMR

  • RbMnCl3

    • Hexagonal structure

    • Antiferromagnet TN=95K

    • Rb, Mn NMR


NMR of Rb2MnCl4


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