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Magnetization and 119Sn Mossbauer Studies in the Intermediate Valence System EuPd2(Si1−xSnx)2; 0 < x < 0.05
Abstract The compound EuPd2Si2, so far has been the most extensively studied Eu based intermediate valence system. It has been established from measurements using various techniques such as magnetic susceptibility, Mossbauer spectroscopy L111 edge X-ray absorption, photoemission etc.1−3 that the Eu atoms in this compound undergo a sharp continuous valence transition from 2+ to 3+ around 160 K. Comparing the 151Eu Mossbauer isomer shift behaviour in concentrated EuPd2Si2 and dilute (Eu1−xRx)pd2si2; R = La and Ce, a cooperative type coupling between the Eu atoms has been suggested4,5 before. Our earlier 151Eu Mossbauer studies in the system EuPd2(Si1−xSnx)2 revealed that, addition of Sn in small concentrations (<0.05 at % at Si site) drastically alters the valence fluctuation properties of the host EuPd2Si2. The results indicated that the alloys transform continuously from a homogeneous mixed valence state at x = 0 to a magnetically ordered state at x = 0.05. At the intermediate concentration x = 0.03 first order valence transition was observed below 60 K, while the specimen with x = 0.02 exhibited the coexistence of homogeneous and first order valence transition. The observed behaviour over a very narrow range of Sn concentration has been thought to be arising from a cooperative valence transformation of the Eu atoms.
Magnetization and 119Sn Mossbauer Studies in the Intermediate Valence System EuPd2(Si1−xSnx)2; 0 < x < 0.05
Abstract The compound EuPd2Si2, so far has been the most extensively studied Eu based intermediate valence system. It has been established from measurements using various techniques such as magnetic susceptibility, Mossbauer spectroscopy L111 edge X-ray absorption, photoemission etc.1−3 that the Eu atoms in this compound undergo a sharp continuous valence transition from 2+ to 3+ around 160 K. Comparing the 151Eu Mossbauer isomer shift behaviour in concentrated EuPd2Si2 and dilute (Eu1−xRx)pd2si2; R = La and Ce, a cooperative type coupling between the Eu atoms has been suggested4,5 before. Our earlier 151Eu Mossbauer studies in the system EuPd2(Si1−xSnx)2 revealed that, addition of Sn in small concentrations (<0.05 at % at Si site) drastically alters the valence fluctuation properties of the host EuPd2Si2. The results indicated that the alloys transform continuously from a homogeneous mixed valence state at x = 0 to a magnetically ordered state at x = 0.05. At the intermediate concentration x = 0.03 first order valence transition was observed below 60 K, while the specimen with x = 0.02 exhibited the coexistence of homogeneous and first order valence transition. The observed behaviour over a very narrow range of Sn concentration has been thought to be arising from a cooperative valence transformation of the Eu atoms.
Magnetization and 119Sn Mossbauer Studies in the Intermediate Valence System EuPd2(Si1−xSnx)2; 0 < x < 0.05
Mishra, S. N. (author) / Devare, H. G. (author)
1987-01-01
4 pages
Article/Chapter (Book)
Electronic Resource
English
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