Spin-carrier coupling induced ferromagnetism and giant resistivity peak in EuCd${}_2$P${}_2$

Abstract

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 Néel 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.

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Cited by in corpus (7)

• Colossal magnetoresistance in EuZn${}_2$P${}_2$ and its electronic and magnetic structure
• Electronic band reconstruction across the insulator-metal transition in colossal magnetoresistive EuCd2P2
• Carrier-induced transition from antiferromagnetic insulator to ferromagnetic metal in the layered phosphide EuZn${}_2$P${}_2$
• Symmetry-breaking pathway towards the unpinned broken helix
• Unusual magnetic and transport properties in the Zintl phase Eu${}_{11}$Zn${}_6$As${}_{12}$
• Recent advances in understanding and manipulating magnetic and electronic properties of Eu$M_2{X}_2$ ($M$ = Zn, Cd; $X$ = P, As)
• Linear magneto-conductivity as a DC probe of time-reversal symmetry breaking