Electronic band reconstruction across the insulator-metal transition in colossal magnetoresistive EuCd2P2

Abstract

While colossal magnetoresistance (CMR) in Eu-based compounds is often associated with strong spin-carrier interactions, the underlying reconstruction of the electronic bands is much less understood from spectroscopic experiments. Here using angle-resolved photoemission, we directly observe an electronic band reconstruction across the insulator-metal (and magnetic) transition in the recently discovered CMR compound EuCd2P2. This transition is manifested by a large magnetic band splitting associated with the magnetic order, as well as unusual energy shifts of the valence bands: both the large ordered moment of Eu and carrier localization in the paramagnetic phase are crucial. Our results provide spectroscopic evidence for an electronic structure reconstruction underlying the enormous CMR observed in EuCd2P2, which could be important for understanding Eu-based CMR materials, as well as designing CMR materials based on large-moment rare-earth magnets.

arXiv comment6 pages, 4 figures

References in corpus (22)

• Colossal Magnetoresistant Materials: The Key Role of Phase Separation
• Complexity in Strongly Correlated Electronic Systems
• Spin fluctuation induced Weyl semimetal state in the paramagnetic phase of EuCd${}_2$As${}_2$
• Manipulating of magnetism in the topological semimetal EuCd2As2
• In-plane antiferromagnetic moments in axion topological insulator candidate EuIn${}_2$As${}_2$
• Magnetic Polarons and the Metal-Semiconductor Transition in (Eu,La)B6 and EuO: Raman Scattering Studies
• Colossal Magnetoresistance without Mixed Valence in a Layered Phosphide Crystal
• A local metallic state in globally insulating $L{a}_{1.24}S{r}_{1.76}M{n}_2{O}_7$ well above the metal-insulator transition
• Field-induced Topological Hall effect in antiferromagnetic axion insulator candidate EuIn${}_2$As${}_2$
• Magnetically-driven electronic phase separation in the semimetallic ferromagnet EuB${}_6$
• Anisotropy of the magnetic and transport properties in EuZn${}_2$As${}_2$
• Colossal magnetoresistance in EuZn${}_2$P${}_2$ and its electronic and magnetic structure
• Unusual Magnetic Properties in Layered Magnetic Topological Insulator EuSn2As2
• Consecutive topological phase transitions and colossal magnetoresistance in a magnetic topological semimetal
• Spin-carrier coupling induced ferromagnetism and giant resistivity peak in EuCd${}_2$P${}_2$
• Magnetotransport in the low carrier density ferromagnet EuB_6
• Optical properties and carrier localization in the layered phosphide EuCd${}_2$P${}_2$
• Magnetic and electronic properties of Eu${}_5$In${}_2$Sb${}_6$
• Microscopic probe of magnetic polarons in antiferromagnetic Eu${}_5$In${}_2$Sb${}_6$
• Giant and Reversible Electronic Structure Evolution in a Magnetic Topological Material EuCd2As2
• Visualizing band selective enhancement of quasiparticle lifetime in a metallic ferromagnet
• Topological magnetic phase transition in Eu-based A-type antiferromagnets

Cited by in corpus (6)

• Carrier-induced transition from antiferromagnetic insulator to ferromagnetic metal in the layered phosphide EuZn${}_2$P${}_2$
• Recent advances in understanding and manipulating magnetic and electronic properties of Eu$M_2{X}_2$ ($M$ = Zn, Cd; $X$ = P, As)
• Spectroscopic signatures of magnetization-induced band renormalization and strong spin-charge-lattice coupling in EuZn${}_2$As${}_2$
• Large ferromagnetic-like band splitting in ultrathin ${\mathrm{SmC}}_6$ films
• Giant-exchange-driven Vectorial Control of a Minimal Topological Magnet in Eu3In2As4
• Temperature Dependent Evolution of the Electronic Structure in EuZn2As2 across the Neel Transition