CeOs4Sb12, a member of the skutterudite family, has an unusual semimetallic low-temperature
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Abstract -phase that inhabits a wedge-like area of the fieldH —temperatureT phase diagram. We have conducted measurements of electrical transport and megahertz conductivity on CeOs4Sb12single crystals under pressures of up to 3 GPa and in high magnetic fields of up to 41 T to investigate the influence of pressure on the differentH –T phase boundaries. While the high-temperature valence transition between the metallic -phase and the -phase is shifted to higherT by pressures of the order of 1 GPa, we observed only a marginal suppression of the -phase that is found below 1 K for pressures of up to 1.91 GPa. High-field quantum oscillations have been observed for pressures up to 3.0 GPa and the Fermi surface of the high-field side of the -phase is found to show a surprising decrease in size with increasing pressure, implying a change in electronic structure rather than a mere contraction of lattice parameters. We evaluate the field-dependence of the effective masses for different pressures and also reflect on the sample dependence of some of the properties of CeOs4Sb12which appears to be limited to the low-field region. -
Ho, P.-C. ; MacLaughlin, D. E. ; Maple, M. B. ; Shu, Lei ; Hillier, A. D. ; Bernal, O. O. ; Yanagisawa, T. ; Biswas, P. K. ; Zhang, Jian ; Tan, Cheng ; et al ( , Physical Review B)
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Zhu, Z. H. ; Zhang, J. ; Ding, Z. F. ; Tan, C. ; Chen, C. S. ; Wu, Q. ; Yang, Y. X. ; Bernal, O. O. ; Ho, P.-C. ; Morris, G. D. ; et al ( , Physical Review B)null (Ed.)