SPECIFIC HEAT OF INSULATING SPIN-GLASSES (Eu, Sr) NEAR THE ONSET OF FERROMAGNETISM

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SPECIFIC HEAT OF INSULATING SPIN-GLASSES (Eu, Sr) NEAR THE ONSET OF FERROMAGNETISM

D. Meschede, F. Steglich, W. Felsch, H. Maletta, W. Zinn

To cite this version:

D. Meschede, F. Steglich, W. Felsch, H. Maletta, W. Zinn. SPECIFIC HEAT OF INSULATING SPIN- GLASSES (Eu, Sr) NEAR THE ONSET OF FERROMAGNETISM. Journal de Physique Colloques, 1980, 41 (C5), pp.C5-347-C5-347. �10.1051/jphyscol:1980559�. �jpa-00219994�

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JOURNAL DE PHYSIQUE Colloque CS, suppl&ment mr no 6 , Tome 41, juin 1980, page C5-347

S P E C I F I C HEAT OF INSULATING SPIN-GLASSES (ELI, ~ r ) NEAR THE ONSET OF FERROMAGNETISM

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D. Meschede, I?. Steglich, W. Felsch, H. Maletta and W. Zinn ^X

I I . Physik. I n s t i t u t d e ~ U n i v e r s i t d t , 5000 KtiZn, W. Germany.

+ I . Physik. I n s t i t u t der U n i v e r s i t d t , 3400 Gtittingen, W. Germany.

X I n s t i t u t fzir FestkBrperforschung, KFA JiiZich, 5170 JziZich, W . Germany.

The specific heat C (T) of the insulating spin-glass Eu Srl-xS with x = 0.40 exhibits

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a linear term 9 at low temperatures and no singularity at T f , similar to metallic spin- glasses. In applied fields B up to 1 -0 T a decrease of y (B) is observed, but in addi-- tion a new term develops passing a ma- ximum. Similar but less pronounced effects are measured in a sample with x = 0.54 below T f = 2.0 K, in which previously a ferroma-

gnetic phase has been detected above T f . Its spin-glass phase is suppressed by B = 1.0 T , indicated by C (T , B) and

x

(T ,B)

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Article published online by EDP Sciences and available at http://dx.doi.org/10.1051/jphyscol:1980559