Evolution of Magnetic Polarons and Spin-Carrier Interactions through the Metal-Insulator Transition in <span class="aps-inline-formula"><math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><mrow><msub><mrow><mi>Eu</mi></mrow><mrow><mn>1</mn><mo>−</mo><mi mathvariant="italic">x</mi></mrow></msub></mrow><mrow><msub><mrow><mi>Gd</mi></mrow><mrow><mi mathvariant="italic">x</mi></mrow></msub></mrow><mi>O</mi></math></span>

H. Rho; C. S. Snow; S. L. Cooper; Z. Fisk; A. Comment; J-Ph Ansermet

doi:10.1103/PhysRevLett.88.127401

Evolution of Magnetic Polarons and Spin-Carrier Interactions through the Metal-Insulator Transition in ${Eu}_{1 - x} {Gd}_{x} O$

H. Rho, C. S. Snow, S. L. Cooper, Z. Fisk, A. Comment, and J-Ph Ansermet

Phys. Rev. Lett. 88, 127401 – Published 12 March 2002

Abstract

Raman scattering studies as functions of temperature, magnetic field, and Gd substitution are used to investigate the evolution of magnetic polarons and spin-carrier interactions through the metal-insulator transition in ${Eu}_{1 - x} {Gd}_{x} O$ . These studies reveal a spin-fluctuation-dominated paramagnetic (PM) regime for $T > T^{*} > T_{C}$ , and a coexistence regime for $T < T^{*}$ in which spin polarons develop and coexist with remnants of the PM phase. They further show a strong connection between spin cluster formation and the dramatic field effects observed in these materials.

Received 26 September 2001

DOI:https://doi.org/10.1103/PhysRevLett.88.127401

Authors & Affiliations

H. Rho¹, C. S. Snow¹, S. L. Cooper¹, Z. Fisk², A. Comment^1,3, and J-Ph Ansermet^1,3

¹Department of Physics and Frederick Seitz Materials Research Laboratory, University of Illinois at Urbana-Champaign, Urbana, Illinois 61801
²National High Magnetic Field Laboratory, Florida State University, 1800 East Paul Dirac Drive, Tallahassee, Florida 32306
³Ecole Polytechnique Fédérale de Lausanne, CH-1015 Lausanne, Switzerland