Magnetic behaviour of Eu_2CuSi_3: Large negative magnetoresistance above Curie temperature

Abstract

We report here the results of magnetic susceptibility, electrical-resistivity, magnetoresistance (MR), heat-capacity and ^{151}Eu Mossbauer effect measurements on the compound, Eu_2CuSi_3, crystallizing in an AlB_2-derived hexagonal structure. The results establish that Eu ions are divalent, undergoing long-range ferromagnetic-ordering below (T_C=) 37 K. An interesting observation is that the sign of MR is negative even at temperatures close to 3T_C, with increasing magnitude with decreasing temperature exhibiting a peak at T_C. This observation, being made for a Cu containing magnetic rare-earth compound for the first time, is of relevance to the field of collosal magnetoresistance.

To appear in PRB, RevTex, 4 pages text + 6 psFigs. Related to our earlier work on Gd systems (see cond-mat/9811382, cond-mat/9811387, cond-mat/9812069, cond-mat/9812365)

References in corpus (3)

• Magnetoresistance in Mn pyrochlore: electrical transport in a low carrier density ferromagnet
• Observation of a temperature dependent electrical resistance minimum above the magnetic ordering temperature in Gd${}_2$PdSi${}_3$
• Large Low Temperature Magnetoresistance and Magnetic Anomalies in Tb${}_2$PdSi${}_3$ and Dy${}_2$PdSi${}_3$

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• Magnetic order in Nd${}_2$PdSi${}_3$ investigated using neutron scattering and muon spin relaxation
• Metamagnetic transitions and anomalous magnetoresistance in EuAg${}_4$As${}_2$ single crystal
• Large magnetoresistance anomalies in Dy7Rh3
• Magnetic frustration and paramagnetic state transport anomalies in Ho4RhAl and Er4RhAl: Possible test cases for newly identified roles of itinerant electrons