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

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Magnetic properties and NMR data of Rb2MnCl4, RbMnCl3 Kang, Byeongki

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  Spin-flop: H>5.5T A.Epstein et. Al., Phys. Rev. B, 2, 3703(1970) H. Rauth et. al.,J. Phys. C: Solid State Phys. 19, 4503(1986)

NMR of Rb 2 MnCl 4  87 Rb  I=3/2, γ =14.0MHz/T  Zero point freq.: MHz  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, (2009)

RbMnCl 3  Structure:  Hexagonal structure  Space group: P6(3)/mmc  a=7.16Å, c=17.80Å  Magnetic properties  Antiferromagnet  T N =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 RbMnCl 3  Rb NMR  2 Peaks  From 2 Rb sites  Spin-lattice Relaxation time  Abrupt change at T N  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  Rb 2 MnCl 4  Tetragonal structure  Antiferromagnet T N =55K  Spin flop : 5.5T  Rb NMR  RbMnCl 3  Hexagonal structure  Antiferromagnet T N =95K  Rb, Mn NMR

NMR of Rb 2 MnCl 4