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Magnetic properties and NMR data of Rb2MnCl4, RbMnCl3

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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  1. Magnetic properties and NMR data of Rb2MnCl4, RbMnCl3 Kang, Byeongki 20110518

  2. contents • Rb2MnCl4 • RbMnCl3 • Summary

  3. 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)

  4. 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)

  5. 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)

  6. 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)

  7. Summary • Rb2MnCl4 • Tetragonal structure • Antiferromagnet TN=55K • Spin flop : 5.5T • Rb NMR • RbMnCl3 • Hexagonal structure • Antiferromagnet TN=95K • Rb, Mn NMR

  8. NMR of Rb2MnCl4

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