EFFECT OF HYDROSTATIC PRESSURE ON THE ISOMER SHIFTS OF THE 6.2 keV RESONANCE OF 181Ta IN TRANSITION METALS

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Submitted on 1 Jan 1974

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EFFECT OF HYDROSTATIC PRESSURE ON THE ISOMER SHIFTS OF THE 6.2 keV RESONANCE OF

181Ta IN TRANSITION METALS

J. Binder, G. Kaindl, D. Salomon, G. Wortmann

To cite this version:

J. Binder, G. Kaindl, D. Salomon, G. Wortmann. EFFECT OF HYDROSTATIC PRESSURE ON THE ISOMER SHIFTS OF THE 6.2 keV RESONANCE OF 181Ta IN TRANSITION METALS.

Journal de Physique Colloques, 1974, 35 (C6), pp.C6-184-C6-184. �10.1051/jphyscol:1974617�. �jpa- 00215774�

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EFFECT OF HYDROSTATIC PRESSURE ON THE ISOMER SHIFTS

OF

THE

6.2

keV RESONANCE OF lS1Ta IN TRANSITION METALS

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J. BINDER, G . K A I N D L (**), D. SALOMON a n d G . W O R T M A N N Physik Department der Technische Universitat Miinchen, D-8046 Garching, Germany

RBsumB. - La variation des deplacements isomeriques avec la pression a et6 etudiee pour des impuretes de lslTa dans des reseaux de Ta, W et Pt. Les resultats sont utilises pour analyser des donnks anterieures sur la variation du deplacement isomerique avec la temperature. On en deduit des valeurs pour la variation avec le volume et la temperature explicite.

Abstract. - Pressure dependence of the isomer shifts has been studied for 181Ta impurities in lattice hosts of Ta, W and Pt. The results are used to analyse earlier results of temperature dependence of the isomer shift. Values for the volume and explicit temperature dependences are derived.

(*) Work supported by the Deutsche Forschungsgemeinschaft.

(**) Present address : Arbeitung fiir Physik und Astronomie der Ruhr. Universitat Bochum, D-463 Bochum, Germany.

MO SSBAUER EFFECT IN Co,MnSn UNDER PRESSURE

I. N. NIKOLAIEV, V. P. POTAPOV and V. P. M A R Y I N Moscow Physical Engineering Institute, Moscow 11 5409, USSR

R&umB. - Plusieurs tentatives ont et6 realisees jusqu'ici pour expliquer qualitativement I'origine du champ magnetique effectif H au site d'un atome non magnetique dans des matrices metalliques magnetiques. L'Ctude de H sous pression peut contribuer Blucider ce probleme. Ce rapport concerne I'influence de la pression sur le deplacement isomerique et le champ magnetique au site de

119Sn dans l'alliage ferromagnetique Co2MnSn.

Les paramktres deduits des spectres Mossbauer de nos Cchantillons a pression ambiante sont identiques a ceux publies [I]. H augmente lineairement selon AH/H = 0,2 % kbar-1 entre 0 et 15 kbar. Le deplacement isomerique change d'environ 0,02 mm/s a 14 kbar. Les resultats sont discutks selon 2 modkles [2], [3] concernant I'origine du champ magnetique au site du noyau Sn. Les resultats du present travail sont en accord avec les 2 modkles. L'Ctude dans une matrice magnetique presentant un faible H (par exemple dans Co et Ni) s'avkre importante pour apporter une reponse definitive au probDme. Ce travail est poursuivi.

Abstract. - At present several attempts were made to give a qualitative explanation of the origin of effective magnetic fields H on the nuclei of non-magnetic atoms in metallic magnetics. Investiga- tion of H under pressure may be helpful in answering this question. This paper reports the influence of hydrostatic pressure on the isomer shift and the magnetic field on Sn119 nuclei in the ferro- magnetic alloy CozMnSn.

The parameters of Mossbauer spectra of our samples at atmospheric pressure are similar to those known from literature [I]. In the range between 0 and 15 kbar a linear increase in H i s found with AHIH = 0.2 % kbar-1. The isomer shift change is about - 0.02 mm/s at 14 kbar. These results are discussed in terms of two alternative models [2] and [3] regarding the origin of the magnetic field at the tin nuclei. The results of the present investigation can be explained on the basis of either model. In order to give a more definitive answer to the question raised an investigation in a magnetic matrix with small module H (e. g. in Co and Ni)appears to be important. The work will be continued.

References

[I] WILLIAMS, J. M., Solid State Phys. 2 (1969) 2037.

[2] CAROLI, B., BLANDIN, A., J. Phys. Chem. Soc. 27 (1966) 503.

[3] BALABANOV, A. E., DELYAGIN, N. N., SOV. Phys. JETP 54 (1968) 1402.

Article published online by EDP Sciences and available at http://dx.doi.org/10.1051/jphyscol:1974617