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.

References in corpus (9)

• Higher-order Topology of Axion Insulator EuIn${}_2$As${}_2$
• Spin fluctuation induced Weyl semimetal state in the paramagnetic phase of EuCd${}_2$As${}_2$
• A Single Pair of Weyl Fermions in Half-metallic EuCd2As2 Semimetal
• Colossal Magnetoresistance without Mixed Valence in a Layered Phosphide Crystal
• Magnetically-driven electronic phase separation in the semimetallic ferromagnet EuB${}_6$
• Pressure-induced ferromagnetism in the topological semimetal EuCd${}_2$As${}_2$
• Resonant X-ray scattering study of diffuse magnetic scattering from the topological semimetals EuCd${}_2$As${}_2$ and EuCd${}_2$Sb${}_2$
• Optical properties and carrier localization in the layered phosphide EuCd${}_2$P${}_2$
• Topological magnetic phase transition in Eu-based A-type antiferromagnets

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