Heat-capacity studies in the Y5-xDyxOs4Ge10 system

Ghosh, K. ; Ramakrishnan, S. ; Chinchure, Aravind D. ; Jonason, Kristian ; Marathe, V. R. ; Chandra, Girish ; Shah, S. S. (1995) Heat-capacity studies in the Y5-xDyxOs4Ge10 system Physical Review B: Condensed Matter and Materials Physics, 51 (17). pp. 11656-11663. ISSN 1098-0121

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Official URL: http://prb.aps.org/abstract/PRB/v51/i17/p11656_1

Related URL: http://dx.doi.org/10.1103/PhysRevB.51.11656


In this paper, we confirm the coexistence of superconductivity and antiferromagnetism in the Y5-xDyxOs4Ge10 system which forms in the tetragonal structure leading to space group P/4mbm. In an earlier study, we have reported a possible coexistence of superconductivity and antiferromagnetism from magnetic susceptibility (χ), resistivity, and magnetoresistance measurements in the same system. Here, we report heat-capacity (Cp) and magnetization data for the same system which establish not only the bulk nature of antiferromagnetic ordering in Dy5Os4Ge10 but also the coexistence of bulk superconductivity and antiferromagnetism in Y2Dy3Os4Ge10. Preliminary magnetization measurements have been made on the superconductor Y5Os4Ge10 to estimate its lower and upper critical fields at T=0 K. Our heat-capacity data on Dy samples show considerable contribution from Schottky effect due to the crystal fields and we have proposed a model (which incorporates Ruderman-Kittel-Kasuya-Yosida exchange interaction) which fits well to the temperature dependence of χ and Cp of all Dy samples with the same crystal-field parameters.

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