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Magnetic Ordering of RAgSb_{2} Compounds

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André G., Bourée F., Kolenda M., Leśniewska B., Oleś A., Szytuła A.

Acta Physica Polonica A

2000

vol. 97

issue 5

771-774

The magnetic structures of the polycrystalline samples of RAgSb_{2} (R=Ce, Pr, Nd, Tb-Tm) are determined. All compounds crystallize in the tetragonal ZrCuSi_{2}-type of crystal structure and except CeAgSb_{2} they are antiferromagnets with a Néel temperature of 11 K for R = Tb and 2 K for Tm. CeAgSb_{2} below T_{C}=9.5 K is ferromagnet with the magnetic moment equal to 0.33μ_{B} and parallel to c-axis. In NdAgSb_{2} the sine modulated magnetic ordering described by the wave vector k = (0.5435,0,0) is observed. Below T_{N} a collinear antiferromagnetic structure with the magnetic (a,a,2c) for R = Pr and (2a,a,c) for R = Tb, Dy, Ho, and Er is observed. For Ho-compound with an increase in temperature the coexistence of two structures is observed: commensurate collinear and incommensurate sine modulated. In TmAgSb_{2} the coexistence of the two phases is observed at T = 1.4 K. With an increase in temperature only the incommensurate phase stays.

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1 Acta Physica Polonica A

1 2000

1 André G.

1 Bourée F.

1 Kolenda M.

1 Leśniewska B.

1 Oleś A.

1 Szytuła A.

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Magnetic Ordering of RAgSb_{2} Compounds