Magnetic Insulator‐Metal Transitions in a Simple Model of Transition Metal Compound

Robaszkiewicz, S.; Micnas, R.

doi:10.1002/pssb.2220630250

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1980

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Cited by 3 publications

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“…Rozpoczął w tym czasie współpracę ze swoim kolegą ze studiów, Stanisławem Robaszkiewiczem, która miała trwać aż do końca życia ich obu. Swój pierwszy wspólny artykuł napisali w 1974 r., [1] a ostatni opublikowali zaledwie parę miesięcy temu, [2] w styczniu 2022 r., ponad 4 lata po śmierci prof. Robaszkiewicza. W sumie stworzyli wspólnie ponad 50 artykułów naukowych.…”

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Nauka

Kostyrko,

Thomas

2022

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Nauka

Kostyrko,

Thomas

2022

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Complete Analytical Solution for the Zero Bandwidth s—f Model

Nolting

Matlak

1984

Physica Status Solidi (b)

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The s-f model, which describes an interacting system of localized magnetic moments and itinerant conduction electrons (magnetic 4f-, 5f-systems), is exactly solved in the zero bandwidth limit without further restrictions. The s-f exchange leads to a splitting of the S-''bad'' into four quasiparticle sub"bands", the spectral weights of which are strongly temperature (T)and carrier concentration (n)-dependent. For special parameter constellations certain spectral weights disappear, so that corresponding excitations are forbidden. Besides the spectral weights some relevant correlation functions as the average spin-dependent occupation number (n,), the density correlation , die nichtekorrelation (nun -,), die ,,gemischte" Korrelation dt(0 = (S(*)c:t)ct(l)) & (Sznl(l)) und speziell die Spin-Polarisation P = ((nt) --(ni))/((nt> + (nl)) als sehr einfache Funktionen von T, n und dem Spinwert S formulieren. Es wird ein qualitativ vollig unterschiedliches Verhalten dieser Funktionen fur ferromagnetische s-f-Kopplung (4f-Systeme) und antiferromagnetische s-f-Kopplung (5f-Systeme) gefunden. the "mixed" correlation &) = (S(*)c;t)ey(l)) ') Domagkstr. 75, D-4400 Miinster, FRG. z, On leave from:

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