Giant hysteretic magnetoresistance accompanying the Mott transition and spin-glass state in organic metal
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arXiv
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| Autori principali: | , , , , , |
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| Natura: | Preprint |
| Pubblicazione: |
2025
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| _version_ | 1866908712417886208 |
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| author | Grigoriev, P. D. Pesotskii, S. I. Lyubovskii, R. B. Torunova, S. A. Lyubshin, D. S. Zverev, V. N. |
| author_facet | Grigoriev, P. D. Pesotskii, S. I. Lyubovskii, R. B. Torunova, S. A. Lyubshin, D. S. Zverev, V. N. |
| contents | The giant magnetoresistance with a huge hysteresis is observed in the organic metal k-(BEDTTTF)2Hg(SCN)2Br at low temperature in a pressure interval around 3 kbar of a width ~1 kbar. The hysteretic magnetoresistance is isotropic with respect to the direction of magnetic field, which excludes the orbital effect of magnetic field as its origin. The observed temperature and magnetic-field dependence of this hysteresis and of its relaxation time indicates the strong influence of spin-glass state on magnetoresistance. Although a quantitative theory of this effect, originating from strong electronic correlations, requires complex numerical calculations, we suggest its explanation and a simple model which qualitatively describes the observed magnetoresistance behavior and shows a strong charge-spin entanglement. The proposed effect suggests a new class of extreme magnetoresistance mechanisms. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2512_13245 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | Giant hysteretic magnetoresistance accompanying the Mott transition and spin-glass state in organic metal Grigoriev, P. D. Pesotskii, S. I. Lyubovskii, R. B. Torunova, S. A. Lyubshin, D. S. Zverev, V. N. Strongly Correlated Electrons The giant magnetoresistance with a huge hysteresis is observed in the organic metal k-(BEDTTTF)2Hg(SCN)2Br at low temperature in a pressure interval around 3 kbar of a width ~1 kbar. The hysteretic magnetoresistance is isotropic with respect to the direction of magnetic field, which excludes the orbital effect of magnetic field as its origin. The observed temperature and magnetic-field dependence of this hysteresis and of its relaxation time indicates the strong influence of spin-glass state on magnetoresistance. Although a quantitative theory of this effect, originating from strong electronic correlations, requires complex numerical calculations, we suggest its explanation and a simple model which qualitatively describes the observed magnetoresistance behavior and shows a strong charge-spin entanglement. The proposed effect suggests a new class of extreme magnetoresistance mechanisms. |
| title | Giant hysteretic magnetoresistance accompanying the Mott transition and spin-glass state in organic metal |
| topic | Strongly Correlated Electrons |
| url | https://arxiv.org/abs/2512.13245 |