Temperature dependent evolution of the electronic and local atomic structure in the cubic colossal magnetoresistive manganite La1-xSrxMnO3

Journal Article · Thu Dec 06 04:00:00 EST 2007 · Physical Review B

OSTI ID:928306

Arenholz, Elke; Mannella, N; Booth, C H; Rosenhahn, A; Sell, B C; Nambu, A; Marchesini, S; Mun, B S; Yang, S -H; Watanabe, M; Ibrahim, K; Arenholz, E; Young, A; Guo, J; Tomioka, Y; Fadley, C S

We have studied the temperature-dependent evolution of the electronic and local atomic structure in the cubic colossal magnetoresistive manganite La{sub 1-x}Sr{sub x}MnO{sub 3} (x= 0.3-0.4) with core and valence level photoemission (PE), x-ray absorption spectroscopy (XAS), x-ray emission spectroscopy (XES), resonant inelastic x-ray scattering (RIXS), extended x-ray absorption fine structure (EXAFS) spectroscopy and magnetometry. As the temperature is varied across the Curie temperature T{sub c}, our PE experiments reveal a dramatic change of the electronic structure involving an increase in the Mn spin moment from {approx} 3 {micro}B to {approx} 4 {micro}B, and a modification of the local chemical environment of the other constituent atoms indicative of electron localization on the Mn atom. These effects are reversible and exhibit a slow-timescale {approx}200 K-wide hysteresis centered at T{sub c}. Based upon the probing depths accessed in our PE measurements, these effects seem to survive for at least 35-50 {angstrom} inward from the surface, while other consistent signatures for this modification of the electronic structure are revealed by more bulk sensitive spectroscopies like XAS and XES/RIXS. We interpret these effects as spectroscopic fingerprints for polaron formation, consistent with the presence of local Jahn-Teller distortions of the MnO{sub 6} octahedra around the Mn atom, as revealed by the EXAFS data. Magnetic susceptibility measurements in addition show typical signatures of ferro-magnetic clusters formation well above the Curie temperature.

• Research Organization: Ernest Orlando Lawrence Berkeley National Laboratory, Berkeley, CA (US)
• Sponsoring Organization: Advanced Light Source Division; Materials Sciences Division
• DOE Contract Number: AC02-05CH11231
• OSTI ID: 928306
• Report Number(s): LBNL-239E
• Journal Information: Physical Review B, Journal Name: Physical Review B Vol. 77
• Country of Publication: United States
• Language: English

Related Subjects

75 CONDENSED MATTER PHYSICS
SUPERCONDUCTIVITY AND SUPERFLUIDITY
ABSORPTION
ABSORPTION SPECTROSCOPY
ATOMS
CURIE POINT
ELECTRONIC STRUCTURE
ELECTRONS
EMISSION SPECTROSCOPY
FINE STRUCTURE
HYSTERESIS
MAGNETIC SUSCEPTIBILITY
MODIFICATIONS
PHOTOEMISSION
POLARONS
SCATTERING
SPECTROSCOPY
SPIN
VALENCE
XAS RIXS EXAFS LSMO CMR GMR PM FM PE