Magnetic polaron formation in EuZn2P2

Cook, Matt [ORNL] (ORCID:0000000288777505); Peterson, Elizabeth [Los Alamos National Laboratory (LANL)]; Kengle, Caitlin S. [University of Illinois at Urbana-Champaign]; Kennedy, Ellis [Los Alamos National Laboratory (LANL)]; Sheeran, Joseph [California Institute of Technology (Caltech), Pasadena]; Girod, Clement [Los Alamos National Laboratory (LANL)]; Freitas, Gabriel [Los Alamos National Laboratory (LANL)]; Greer, Samuel [Los Alamos National Laboratory (LANL)]; Abbamone, Peter [University of Illinois at Urbana-Champaign]; Pagliuso, P G [Instituto de Fisica Gleb Wataghin, Unicamp, Brazil]; Thompson, Joe D [Los Alamos National Laboratory (LANL)]; Thomas, Sean [Los Alamos National Laboratory (LANL)]; Rosa, P [Los Alamos National Laboratory (LANL)]

doi:10.1103/fs97-mpcq

DOE OSTI · 3002348

Magnetic polaron formation in EuZn2P2

Cook, Matt [ORNL] (ORCID:0000000288777505)·Peterson, Elizabeth [Los Alamos National Laboratory (LANL)]·Kengle, Caitlin S. [University of Illinois at Urbana-Champaign]·Kennedy, Ellis [Los Alamos National Laboratory (LANL)]·Sheeran, Joseph [California Institute of Technology (Caltech), Pasadena]·Girod, Clement [Los Alamos National Laboratory (LANL)]·Freitas, Gabriel [Los Alamos National Laboratory (LANL)]·Greer, Samuel [Los Alamos National Laboratory (LANL)]·Abbamone, Peter [University of Illinois at Urbana-Champaign]·Pagliuso, P G [Instituto de Fisica Gleb Wataghin, Unicamp, Brazil]·Thompson, Joe D [Los Alamos National Laboratory (LANL)]·Thomas, Sean [Los Alamos National Laboratory (LANL)]·Rosa, P [Los Alamos National Laboratory (LANL)]

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Abstract

Colossal magnetoresistance (CMR) has been observed across many Eu2+-based materials; however, its origin is not completely understood. Here we investigate the antiferromagnetic insulator EuZn2⁢P2 through single crystal x-ray diffraction, transmission electron microscopy, electrical transport, magnetization, dilatometry, and electron spin resonance measurements complemented by density functional theory calculations. Our electrical resistivity data reveal a large negative magnetoresistance, MR=[𝑅⁡(𝐻)−𝑅⁡(0)]/𝑅⁡(0), that reaches MR=−99.7% at 9 T near the antiferromagnetic ordering temperature 𝑇𝑁=23K. Dilatometry measurements show an accompanying field-induced lattice strain. Additionally, Eu2+ electron spin resonance reveals a strong ferromagnetic exchange interaction between Eu2+ and conduction electrons. Our experimental results in EuZn2⁢P2 are consistent with a magnetic polaron scenario and suggest magnetic polaron formation as a prevailing explanation of CMR in Eu2+-based compounds.

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Cook, Matt [ORNL] (ORCID:0000000288777505), Peterson, Elizabeth [Los Alamos National Laboratory (LANL)], Kengle, Caitlin S. [University of Illinois at Urbana-Champaign], Kennedy, Ellis [Los Alamos National Laboratory (LANL)], Sheeran, Joseph [California Institute of Technology (Caltech), Pasadena], Girod, Clement [Los Alamos National Laboratory (LANL)], Freitas, Gabriel [Los Alamos National Laboratory (LANL)], Greer, Samuel [Los Alamos National Laboratory (LANL)], Abbamone, Peter [University of Illinois at Urbana-Champaign], Pagliuso, P G [Instituto de Fisica Gleb Wataghin, Unicamp, Brazil], Thompson, Joe D [Los Alamos National Laboratory (LANL)], Thomas, Sean [Los Alamos National Laboratory (LANL)], Rosa, P [Los Alamos National Laboratory (LANL)]. 2025-10-01. Magnetic polaron formation in EuZn2P2. https://doi.org/10.1103/fs97-mpcq

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