A aeo&ical invatigation is made of the Moasbauer shift in crystals containing exchange coupled magnetic ions. It is found that the shift is caused by the exchange interaction and &pen& on the degree of ordering of the spin system. PaccMOTpeH BOIIPOC 0 BeJlUYUHe CnBUra M0CC6ay3pOBCKOrO CIIeKTpa B KpUCTaJInax, conepWaUUX MarHUTHbIe HOHbI, CBFI3aHHbIe 06MeHHbIM B3aUMOnefiCTBHeM. BunCHeHO, 4TO 06MeHHbIe B3aUMOXeftCTBUfl npMBOn.RT K CnBHIY, 3aBMCcllrreMy OT CTeneHu ynopanosesun CnUH-CUCTeMbl.

o f t h e Mdtjssbauer e f f e c t a r e known t o depend on the impurity nucleus (1, 2). The i n t e n s i t y and t h e r e l a t i v e s h i f t of t h e Mtlssbauer l i n e i s defined by t h e phonon s t a t e of t h e c r y s t a l ( 3 , 4). The presence of conduction e l e c t r o n s i n metals and t h e i r i n t e r a c t i o n w i t h t h e l a t t i c e v i b r a t i o n s influence t h e phonon s t a t e of t h e c r y s t a l . I n t h e present note t h e i n t e n s i t y and t h e r e l a t i v e s h i f t of t h e Mtissbauer spectrum i n metals i s c a l c u l a t e d t a k i n g i n t o account electron-phonon i n t e r a c t i o n . It is found that t h e electron-phonon i n t e r a c t i o n can lead t o a measurable influence on t h e r e l a t i v e s h i f t . i n metals we used Frtihlich's Hamiltonian I n t h e c a l c u l a t i o n of t h e i n t e n s i t y and t h e r e l a t i v e s h i f t and confined t o t h e case of a non-degenerate v i b r a t i o n spectrum. Then i n accordance with ( 4 ) t h e following expressions were obt ained : f = exp(-2~) ,where and

No abstract

In the present note the oscillations of the shift of the Mossbauer line in metals connected with the electron-phonon interaction are calculated.The relative shift of the Mossbauer line in a metal considering the interaction * + of conduction electrons with the lattice vibrations is proportional to g ( 6 , k , k )/ /(w (k j) -Q ( 6 , "p -5 ) ) (1). If the renormalized energy of the phonon hG(kj) comes near to the energy change of the electron hQ(G, $ -z), a fast increase of the shift of the Wossbauer line arises. Such resonance increase of the line shift will be observed only for electrons near the Fermi level as they take part in the thermal excitation of the system.