TY - JOUR

T1 - Melting of charge/orbital ordered states in Temperature and magnetic-field-dependent optical studies

AU - Jung, J.

AU - Lee, H.

AU - Noh, T.

AU - Choi, E.

AU - Moritomo, Y.

PY - 2000

Y1 - 2000

N2 - We investigated the temperature (Formula presented) and the magnetic-field-dependent (Formula presented) optical conductivity spectra of a charge-orbital-ordered manganite (Formula presented) With variation of T and H, large spectral weight changes were observed up to 4.0 eV. These spectral weight changes could be explained using the polaron picture. Interestingly, our results suggested that some local ordered state might remain above the charge ordering temperature, and that the charge/orbital melted state at a high magnetic field (i.e., at (Formula presented) and (Formula presented) should be a three-dimensional ferromagnetic metal. We also investigated the first order phase transition from the charge-orbital- ordered state to ferromagnetic metallic state using the T- and H-dependent dielectric constants (Formula presented) Through the analysis of (Formula presented) using an effective medium approximation, we found that the melting of charge-orbital-ordered states should occur through the percolation of ferromagnetic metal domains.

AB - We investigated the temperature (Formula presented) and the magnetic-field-dependent (Formula presented) optical conductivity spectra of a charge-orbital-ordered manganite (Formula presented) With variation of T and H, large spectral weight changes were observed up to 4.0 eV. These spectral weight changes could be explained using the polaron picture. Interestingly, our results suggested that some local ordered state might remain above the charge ordering temperature, and that the charge/orbital melted state at a high magnetic field (i.e., at (Formula presented) and (Formula presented) should be a three-dimensional ferromagnetic metal. We also investigated the first order phase transition from the charge-orbital- ordered state to ferromagnetic metallic state using the T- and H-dependent dielectric constants (Formula presented) Through the analysis of (Formula presented) using an effective medium approximation, we found that the melting of charge-orbital-ordered states should occur through the percolation of ferromagnetic metal domains.

UR - http://www.scopus.com/inward/record.url?scp=0001406668&partnerID=8YFLogxK

U2 - 10.1103/PhysRevB.62.481

DO - 10.1103/PhysRevB.62.481

M3 - Article

AN - SCOPUS:0001406668

SN - 1098-0121

VL - 62

SP - 481

EP - 487

JO - Physical Review B - Condensed Matter and Materials Physics

JF - Physical Review B - Condensed Matter and Materials Physics

IS - 1

ER -