Angle-dependent magnetoresistance oscillations and Fermi surface reordering at high magnetic fields in α-(ET)2KHg(SCN)4
Angle dependent magnetoresistance oscillations (AMRO) have been studied in the charge transfer salt α-(ET)2KHg(SCN)4 for magnetic fields in the range 0 - 30 T. This salt exhibits the onset of antiferromagnetic order at temperatures TN approx.8-10 K and the presence below this temperature of a region...
| Main Authors: | , , , , , , , , , |
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| Format: | Journal article |
| Language: | English |
| Published: |
Elsevier
1995
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| _version_ | 1797099832260689920 |
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| author | Caulfield, J Blundell, S Singleton, J House, A du Croo de Jongh, M Hendriks, P Perenboom, J Hayes, W Kurmoo, M Day, P |
| author_facet | Caulfield, J Blundell, S Singleton, J House, A du Croo de Jongh, M Hendriks, P Perenboom, J Hayes, W Kurmoo, M Day, P |
| author_sort | Caulfield, J |
| collection | OXFORD |
| description | Angle dependent magnetoresistance oscillations (AMRO) have been studied in the charge transfer salt α-(ET)2KHg(SCN)4 for magnetic fields in the range 0 - 30 T. This salt exhibits the onset of antiferromagnetic order at temperatures TN approx.8-10 K and the presence below this temperature of a region of sharp negative magnetoresistance at a field around 22 T known as the 'kink'. AMRO have been measured in this salt for a wide range of applied fields since the period, amplitude, and nature of the oscillations can be used to directly infer the character of the Fermi surface (FS) as a function of field. The data indicate that a profound change in the band structure occurs at this kink transition; the high field phase is characterised by quasi-2D oscillations from a closed cylindrical FS which is elongated in the c direction; the low field phase appears to be a spin density wave groundstate, with a FS consisting of a sheet (which is quasi-1D in character and tilted at an angle of approx.21° to the b*c plane) and small closed 2D pockets. It is suggested that the breakdown orbits between the pockets and the 1D sheets are able to account for the various Shubnikov-de Haas frequencies observed below the kink. |
| first_indexed | 2024-03-07T05:29:13Z |
| format | Journal article |
| id | oxford-uuid:e1a016d5-6102-40ed-aa92-8b19cdbd5628 |
| institution | University of Oxford |
| language | English |
| last_indexed | 2024-03-07T05:29:13Z |
| publishDate | 1995 |
| publisher | Elsevier |
| record_format | dspace |
| spelling | oxford-uuid:e1a016d5-6102-40ed-aa92-8b19cdbd56282022-03-27T09:55:50ZAngle-dependent magnetoresistance oscillations and Fermi surface reordering at high magnetic fields in α-(ET)2KHg(SCN)4 Journal articlehttp://purl.org/coar/resource_type/c_dcae04bcuuid:e1a016d5-6102-40ed-aa92-8b19cdbd5628EnglishSymplectic Elements at OxfordElsevier1995Caulfield, JBlundell, SSingleton, JHouse, Adu Croo de Jongh, MHendriks, PPerenboom, JHayes, WKurmoo, MDay, PAngle dependent magnetoresistance oscillations (AMRO) have been studied in the charge transfer salt α-(ET)2KHg(SCN)4 for magnetic fields in the range 0 - 30 T. This salt exhibits the onset of antiferromagnetic order at temperatures TN approx.8-10 K and the presence below this temperature of a region of sharp negative magnetoresistance at a field around 22 T known as the 'kink'. AMRO have been measured in this salt for a wide range of applied fields since the period, amplitude, and nature of the oscillations can be used to directly infer the character of the Fermi surface (FS) as a function of field. The data indicate that a profound change in the band structure occurs at this kink transition; the high field phase is characterised by quasi-2D oscillations from a closed cylindrical FS which is elongated in the c direction; the low field phase appears to be a spin density wave groundstate, with a FS consisting of a sheet (which is quasi-1D in character and tilted at an angle of approx.21° to the b*c plane) and small closed 2D pockets. It is suggested that the breakdown orbits between the pockets and the 1D sheets are able to account for the various Shubnikov-de Haas frequencies observed below the kink. |
| spellingShingle | Caulfield, J Blundell, S Singleton, J House, A du Croo de Jongh, M Hendriks, P Perenboom, J Hayes, W Kurmoo, M Day, P Angle-dependent magnetoresistance oscillations and Fermi surface reordering at high magnetic fields in α-(ET)2KHg(SCN)4 |
| title | Angle-dependent magnetoresistance oscillations and Fermi surface reordering at high magnetic fields in α-(ET)2KHg(SCN)4
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| title_full | Angle-dependent magnetoresistance oscillations and Fermi surface reordering at high magnetic fields in α-(ET)2KHg(SCN)4
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| title_fullStr | Angle-dependent magnetoresistance oscillations and Fermi surface reordering at high magnetic fields in α-(ET)2KHg(SCN)4
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| title_full_unstemmed | Angle-dependent magnetoresistance oscillations and Fermi surface reordering at high magnetic fields in α-(ET)2KHg(SCN)4
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| title_short | Angle-dependent magnetoresistance oscillations and Fermi surface reordering at high magnetic fields in α-(ET)2KHg(SCN)4
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| title_sort | angle dependent magnetoresistance oscillations and fermi surface reordering at high magnetic fields in α et 2khg scn 4 |
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