Pressure-induced shift of effective Ce valence, Fermi energy and phase boundaries in CeOs4Sb12
CeOs _4 Sb _12 , a member of the skutterudite family, has an unusual semimetallic low-temperature $\mathcal{L}$ -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 CeOs _4 Sb _12 sing...
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| Format: | Article |
| Language: | English |
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IOP Publishing
2022-01-01
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| Series: | New Journal of Physics |
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| Online Access: | https://doi.org/10.1088/1367-2630/ac643c |
| _version_ | 1797748432357556224 |
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| author | K Götze M J Pearce M J Coak P A Goddard A D Grockowiak W A Coniglio S W Tozer D E Graf M B Maple P-C Ho M C Brown J Singleton |
| author_facet | K Götze M J Pearce M J Coak P A Goddard A D Grockowiak W A Coniglio S W Tozer D E Graf M B Maple P-C Ho M C Brown J Singleton |
| author_sort | K Götze |
| collection | DOAJ |
| description | CeOs _4 Sb _12 , a member of the skutterudite family, has an unusual semimetallic low-temperature $\mathcal{L}$ -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 CeOs _4 Sb _12 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 $\mathcal{H}$ -phase and the $\mathcal{L}$ -phase is shifted to higher T by pressures of the order of 1 GPa, we observed only a marginal suppression of the $\mathcal{S}$ -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 $\mathcal{H}$ -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 CeOs _4 Sb _12 which appears to be limited to the low-field region. |
| first_indexed | 2024-03-12T16:04:40Z |
| format | Article |
| id | doaj.art-8243f459af454420be79e38580642286 |
| institution | Directory Open Access Journal |
| issn | 1367-2630 |
| language | English |
| last_indexed | 2024-03-12T16:04:40Z |
| publishDate | 2022-01-01 |
| publisher | IOP Publishing |
| record_format | Article |
| series | New Journal of Physics |
| spelling | doaj.art-8243f459af454420be79e385806422862023-08-09T14:24:38ZengIOP PublishingNew Journal of Physics1367-26302022-01-0124404304410.1088/1367-2630/ac643cPressure-induced shift of effective Ce valence, Fermi energy and phase boundaries in CeOs4Sb12K Götze0https://orcid.org/0000-0001-9108-9490M J Pearce1M J Coak2https://orcid.org/0000-0002-1015-8683P A Goddard3https://orcid.org/0000-0002-0666-5236A D Grockowiak4https://orcid.org/0000-0002-3938-414XW A Coniglio5https://orcid.org/0000-0001-8170-8411S W Tozer6D E Graf7M B Maple8https://orcid.org/0000-0002-5909-6057P-C Ho9https://orcid.org/0000-0002-9703-0024M C Brown10J Singleton11https://orcid.org/0000-0001-6109-6905Department of Physics, University of Warwick , Coventry CV4 7AL, United KingdomDepartment of Physics, University of Warwick , Coventry CV4 7AL, United KingdomDepartment of Physics, University of Warwick , Coventry CV4 7AL, United KingdomDepartment of Physics, University of Warwick , Coventry CV4 7AL, United KingdomNational High Magnetic Field Laboratory, Florida State University , Tallahassee, Florida, 32310, United States of AmericaNational High Magnetic Field Laboratory, Florida State University , Tallahassee, Florida, 32310, United States of AmericaNational High Magnetic Field Laboratory, Florida State University , Tallahassee, Florida, 32310, United States of AmericaNational High Magnetic Field Laboratory, Florida State University , Tallahassee, Florida, 32310, United States of AmericaDepartment of Physics, University of California , San Diego, La Jolla, CA 92093, United States of AmericaDepartment of Physics, California State University , Fresno, CA 93740, United States of AmericaDepartment of Physics, California State University , Fresno, CA 93740, United States of AmericaNational High Magnetic Field Laboratory, Los Alamos National Laboratory , MS-E536, Los Alamos, New Mexico 87545, United States of AmericaCeOs _4 Sb _12 , a member of the skutterudite family, has an unusual semimetallic low-temperature $\mathcal{L}$ -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 CeOs _4 Sb _12 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 $\mathcal{H}$ -phase and the $\mathcal{L}$ -phase is shifted to higher T by pressures of the order of 1 GPa, we observed only a marginal suppression of the $\mathcal{S}$ -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 $\mathcal{H}$ -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 CeOs _4 Sb _12 which appears to be limited to the low-field region.https://doi.org/10.1088/1367-2630/ac643cpressurevalence transitionCeOs4Sb12quantum oscillationsquantum criticality |
| spellingShingle | K Götze M J Pearce M J Coak P A Goddard A D Grockowiak W A Coniglio S W Tozer D E Graf M B Maple P-C Ho M C Brown J Singleton Pressure-induced shift of effective Ce valence, Fermi energy and phase boundaries in CeOs4Sb12 New Journal of Physics pressure valence transition CeOs4Sb12 quantum oscillations quantum criticality |
| title | Pressure-induced shift of effective Ce valence, Fermi energy and phase boundaries in CeOs4Sb12 |
| title_full | Pressure-induced shift of effective Ce valence, Fermi energy and phase boundaries in CeOs4Sb12 |
| title_fullStr | Pressure-induced shift of effective Ce valence, Fermi energy and phase boundaries in CeOs4Sb12 |
| title_full_unstemmed | Pressure-induced shift of effective Ce valence, Fermi energy and phase boundaries in CeOs4Sb12 |
| title_short | Pressure-induced shift of effective Ce valence, Fermi energy and phase boundaries in CeOs4Sb12 |
| title_sort | pressure induced shift of effective ce valence fermi energy and phase boundaries in ceos4sb12 |
| topic | pressure valence transition CeOs4Sb12 quantum oscillations quantum criticality |
| url | https://doi.org/10.1088/1367-2630/ac643c |
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