Spin-carrier coupling induced ferromagnetism and giant resistivity peak in EuCd\(_2\)P\(_2\)

EuCd\(_2\)P\(_2\) is notable for its unconventional transport: upon cooling the metallic resistivity changes slope and begins to increase, ultimately 100-fold, before returning to its metallic value. Surprisingly, this giant peak occurs at 18K, well above the N\'{e}el temperature (\(T_N\)) of 1...

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Bibliographic Details
Published in:arXiv.org 2022-08
Main Authors: Sunko, Veronika, Sun, Yue, Vranas, Mayia, Homes, Christopher C, Lee, Changmin, Donoway, Elizabeth, Zhi-Cheng, Wang, Sudhaman Balguri, Mahendru, Mira B, Ruiz, Alejandro, Gunn, Brandon, Basak, Rourav, Schierle, Enrico, Weschke, Eugene, Tafti, Fazel, Frano, Alex, Orenstein, Joseph
Format: Article
Language:English
Subjects:
Coupling
Electrical resistivity
Ferromagnetism
X-ray scattering
Online Access:Get full text
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Summary:EuCd\(_2\)P\(_2\) is notable for its unconventional transport: upon cooling the metallic resistivity changes slope and begins to increase, ultimately 100-fold, before returning to its metallic value. Surprisingly, this giant peak occurs at 18K, well above the N\'{e}el temperature (\(T_N\)) of 11.5K. Using a suite of sensitive probes of magnetism, including resonant x-ray scattering and magneto-optical polarimetry, we have discovered that ferromagnetic order onsets above \(T_N\) in the temperature range of the resistivity peak. The observation of inverted hysteresis in this regime shows that ferromagnetism is promoted by coupling of localized spins and itinerant carriers. The resulting carrier localization is confirmed by optical conductivity measurements.
ISSN:2331-8422
DOI:10.48550/arxiv.2208.05499