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Data for Pressure-induced shift of effective Ce valence, Fermi energy and phase boundaries in CeOs4Sb12 Kathrin Gotze (24901165) Matthew J. Pearce (24901168) Matthew John Coak (24935923) Paul Goddard (564595) Audrey Grockowiak (24974461) William Coniglio (24974464) Stanley Tozer (24974467) David Graf (1776046) M Brian Maple (24974470) Pei-Chun Ho (2287567) Matthew Brown (307585) John Singleton (1411675) Cerium Valence fluctuations Skutterudite Semimetals Migrated from ePrints CeOs4Sb12, a member of the skutterudite family, has an unusual semimetallic low-temperature L-phase that inhabits a wedge-like area of the field H - temperature T phase diagram. We have conducted measurements of electrical transport and megahertz conductivity on CeOs4Sb12 single 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 different H-T phase boundaries. While the high-temperature valence transition between the metallic H-phase and the L-phase is shifted to higher T by pressures of the order of 1 GPa, we observed only a marginal suppression of the S-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 H-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 CeOs4Sb12 which appears to be limited to the low-field region.<br><br>Files represent: Temperature and resisitivity Amplitude of the quantum oscillations after background subtraction and the magnetic field B Magnetic field B and the amplitude of the quantum oscillations after background subtraction Inverse magnetic field and the amplitude of the quantum oscillations after background subtraction For more details, refer the Readme file. 2022-04-26T00:00:00Z Dataset Dataset 10.82444/warw.33840478.v1 https://figshare.com/articles/dataset/Data_for_Pressure-induced_shift_of_effective_Ce_valence_Fermi_energy_and_phase_boundaries_in_CeOs4Sb12/33840478 CC BY 4.0