Hyperfine and Superhyperfine Structure of Manganese in Sn $O_{2}$

The electron paramagnetic resonance spectrum of manganese in a single crystal of Sn

O_{2}

(cassiterite) was investigated at

K

and

K_{A}

band frequencies at a temperature of 77°K. The manganese atoms occupy

{Sn}^{4 +}

substitutional sites giving the same charge with a resulting spin ground state of

S = \frac{3}{2}

. The hyperfine structure (HFS) with

I = \frac{5}{2}

and the superhyperfine structure (SHFS) show large anisotropies which can be explained by the relatively large values of

D

and

E

in the spin-Hamiltonian. The strong overlaps of the wave functions of the central manganese ion with those of the nearest-neighbor tins along the

C

axis accounts for the large SHFS,

a = 34

G. An attempt to explain these data from the experimental evidence is given. The spin-Hamiltonian and the constants for the

C

axis and magnetic

Z

axis coincident are

H = β S \cdot g \cdot H + D [{S_{z}}^{2} - \frac{1}{3} S (S + 1)] + E ({S_{x}}^{2} - {S_{y}}^{2}) + S \cdot A \cdot I + Σ \overset{2}{i = 1} S \cdot a_{i} \cdot I_{Sn} .

In addition, the resonance results obtained for

{Mn}^{4 +}

in Sn

O_{2}

are compared with those obtained for

{Cr}^{3 +}

and

V^{4 +}

in Sn

O_{2}

and for

{Cr}^{3 +}

V^{4 +}

, and

{Mn}^{4 +}

in Ti

O_{2}

This publication has 9 references indexed in Scilit:

Hyperfine and Superhyperfine Structure of Manganese in SnO2