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Magnetization steps (MST's) from Mn pairs in several single crystals ofZn_(1-x)Mn_xO (0.0056<=x<=0.030, and in one powder (x=0.029), were observed.The largest two exchange constants, J1/kB=-18.2+/-0.5K and J1'/kB=-24.3+/-0.6K,were obtained from large peaks in the differential susceptibility, dM/dH,measured in pulsed magnetic fields, H, up to 500 kOe. These two largest J's areassociated with the two inequivalent classes of nearest neighbors (NN's) in thewurtzite structure. The 29% difference between J1 and J1' is substantiallylarger than 13% in CdS:Mn, and 15% in CdSe:Mn. The pulsed-field data alsoindicate that, despite the direct contact between the samples and asuperfluid-helium bath, substantial departures from thermal equilibriumoccurred during the 7.4 ms pulse. The third- and fourth-largest J's weredetermined from the magnetization M at 20 mK, measured in dc magnetic fields Hup to 90 kOe. Both field orientations H||c and H||[10-10] were studied. (The[10-10] direction is perpendicular to the c-axis, [0001].) By definition,neighbors which are not NN's are distant neighbors (DN's). The largest DNexchange constant (third-largest overall), has the value J/kB=-0.543+/-0.005K,and is associated with the DN at r=c. Because this is not the closest DN, thisresult implies that the J's do not decrease monotonically with the distance r.The second-largest DN exchange constant (fourth-largest overall), has the valueJ/kB=-0.080 K. It is associated with one of the two classes of neighbors thathave a coordination number z=12, but the evidence is insufficient for adefinite unique choice. The dependence of M on the direction of H givesD/kB=-0.039+/-0.008K, in fair agreement with -0.031 K from earlier EPR work.Comment: 12 pages, 10 figures. Submitted to PR

physical review. b, condensed matter and materials physics

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Magnetization steps inZn1−xMnxO:Four largest …