تقرير
Magnetic competition induced colossal magnetoresistance in n-type HgCr2Se4 under high pressures
| العنوان: | Magnetic competition induced colossal magnetoresistance in n-type HgCr2Se4 under high pressures |
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| المؤلفون: | Sun, J. P., Jiao, Y. Y., Yi, C. J., Dissanayake, S. E., Matsuda, M., Uwatoko, Y., Shi, Y. G., Li, Y. Q., Fang, Z., Cheng, J. -G. |
| المصدر: | Phys. Rev. Lett. 123, 047201 (2019) |
| سنة النشر: | 2019 |
| المجموعة: | Condensed Matter |
| مصطلحات موضوعية: | Condensed Matter - Strongly Correlated Electrons |
| الوصف: | The n-type HgCr2Se4 exhibits a sharp semiconductor-to-metal transition (SMT) in resistivity accompanying the ferromagnetic order at TC = 106 K. Here, we investigate the effects of pressure and magnetic field on the concomitant SMT and ferromagnetic order by measuring resistivity, dc and ac magnetic susceptibility, as well as single-crystal neutron diffraction under various pressures up to 8 GPa and magnetic fields up to 8 T. Our results demonstrate that the ferromagnetic metallic ground state of n-type HgCr2Se4 is destabilized and gradually replaced by an antiferromagnetic, most likely a spiral magnetic, and insulating ground state upon the application of high pressure. On the other hand, the application of external magnetic fields can restore the ferromagnetic metallic state again at high pressures, resulting in a colossal magnetoresistance (CMR) as high as ~ 3 * 10^11 % under 5 T and 2 K at 4 GPa. The present study demonstrates that n-type HgCr2Se4 is located at a peculiar critical point where the balance of competion between ferromagnetic and antiferromagnetic interactions can be easily tipped by the external stimuli, providing a new platform for achieving CMR in a single-valent system. Comment: 6 pages, 4 figures |
| نوع الوثيقة: | Working Paper |
| DOI: | 10.1103/PhysRevLett.123.047201 |
| URL الوصول: | http://arxiv.org/abs/1903.10689 |
| رقم الأكسشن: | edsarx.1903.10689 |
| قاعدة البيانات: | arXiv |
| DOI: | 10.1103/PhysRevLett.123.047201 |
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