Ordering in the dilute weakly-anisotropic antiferromagnet Mn(0.35)Zn(0.65)F2

Details Ordering in the dilute weakly-anisotropic antiferromagnet Mn(0.35)Zn(0.65)F2 Ordering in the dilute weakly-anisotropic antiferromagnet Mn(0.35)Zn(0.65)F2

1999-07-28

arxiv.org/abs/cond-mat/9907450v1

Physics

Condensed Matter

Disordered Systems and Neural Networks

7 pages, 5 figures

Scientific paper

10.1103/PhysRevB.61.14681

The highly diluted antiferromagnet Mn(0.35)Zn(0.65)F2 has been investigated by neutron scattering in zero field. The Bragg peaks observed below the Neel temperature TN (approximately 10.9 K) indicate stable antiferromagnetic long-range ordering at low temperature. The critical behavior is governed by random-exchange Ising model critical exponents (nu approximately 0.69 and gamma approximately 1.31), as reported for Mn(x)Zn(1-x)F2 with higher x and for the isostructural compound Fe(x)Zn(1-x)F2. However, in addition to the Bragg peaks, unusual scattering behavior appears for |q|>0 below a glassy temperature Tg approximately 7.0 K. The glassy region T

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