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19 April 2024 |
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Suppression of a charge density wave ground state in high magnetic fields: spin and orbital mechanisms | | D. Graf
; J.S. Brooks
; E.S. Choi
; S. Uji
; J.C. Dias
; M. Almeida
; M. Matos
; | | Date: |
18 Nov 2003 | | Subject: | Strongly Correlated Electrons | cond-mat.str-el | | Abstract: | The charge density wave (CDW) transition temperature in the quasi-one dimensional (Q1D) organic material of (Per)$_2$Au(mnt)$_2$ is relatively low (TCDW = 12 K). Hence in a mean field BCS model, the CDW state should be completely suppressed in magnetic fields of order 30 - 40 T. To explore this possibility, the magnetoresistance of (Per)$_2$Au(mnt)$_2$ was investigated in magnetic fields to 45 T for 0.5 K < T < 12 K. For fields directed along the Q1D molecular stacking direction, TCDW decreases with field, terminating at about ~ 37 T for temperatures approaching zero. Results for this field orientation are in general agreement with theoretical predictions, including the field dependence of the magnetoresistance and the energy gap, $Delta_{CDW}$. However, for fields tilted away from the stacking direction, orbital effects arise above 15 T that may be related to the return of un-nested Fermi surface sections that develop as the CDW state is suppressed. These findings are consistent with expectations that quasi-one dimensional metallic behavior will return outside the CDW phase boundary. | | Source: | arXiv, cond-mat/0311399 | | Services: | Forum | Review | PDF | Favorites | |
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