, Volume 44, Issue 5-6, pp 553-568

Observation of the coexistence of superconductivity and long-range magnetic order in TmRh4B4

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The ac electrical resistance, heat capacity, static magnetic susceptibility, thermal conductivity, and linear thermal expansion coefficient have been measured for the superconducting ternary compound TmRh4B4. The results indicate that the Tm3+ magnetic moments order at about 0.4 K, while bulk superconductivity, which occurs at 9.8 K, persists to temperatures below 60 mK, which was the low-temperature limit of the apparatus. Various possibilities for the type of magnetic order are examined.

Research supported by U.S. Department of Energy under Contract No. DE-AT03-76ER70227.
On leave from Instituto de Fisica “Gleb Wataghin,” Universidade Estadual de Campinas, Campinas-SP, Brazil. Also supported by FAPESP.
Research supported by the Schweizerische Nationalfonds zur Förderung der Wissenschaftlichen Forschung.