Universität zu Köln

Ulrich, C., Khaliullin, G., Guennou, M., Roth, H., Lorenz, T. and Keimer, B. (2015). Spin-Orbital Excitation Continuum and Anomalous Electron-Phonon Interaction in the Mott Insulator LaTiO3. Phys. Rev. Lett., 115 (15). COLLEGE PK: AMER PHYSICAL SOC. ISSN 1079-7114

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Abstract

Raman scattering experiments on stoichiometric, Mott-insulating LaTiO3 over a wide range of excitation energies reveal a broad electronic continuum which is featureless in the paramagnetic state, but develops a gap of similar to 800 cm(-1) upon cooling below the Neel temperature T-N = 146 K. In the antiferromagnetic state, the spectral weight below the gap is transferred to well-defined spectral features due to spin and orbital excitations. Low-energy phonons exhibit pronounced Fano anomalies indicative of strong interaction with the electron system for T > T-N, but become sharp and symmetric for T < T-N. The electronic continuum and the marked renormalization of the phonon lifetime by the onset of magnetic order are highly unusual for Mott insulators and indicate liquidlike correlations between spins and orbitals.

Item Type:	Journal Article
Creators:	Creators Email ORCID ORCID Put Code Ulrich, C. UNSPECIFIED UNSPECIFIED UNSPECIFIED Khaliullin, G. UNSPECIFIED UNSPECIFIED UNSPECIFIED Guennou, M. UNSPECIFIED UNSPECIFIED UNSPECIFIED Roth, H. UNSPECIFIED UNSPECIFIED UNSPECIFIED Lorenz, T. UNSPECIFIED UNSPECIFIED UNSPECIFIED Keimer, B. UNSPECIFIED UNSPECIFIED UNSPECIFIED
URN:	urn:nbn:de:hbz:38-389977
DOI:	10.1103/PhysRevLett.115.156403
Journal or Publication Title:	Phys. Rev. Lett.
Volume:	115
Number:	15
Date:	2015
Publisher:	AMER PHYSICAL SOC
Place of Publication:	COLLEGE PK
ISSN:	1079-7114
Language:	English
Faculty:	Unspecified
Divisions:	Unspecified
Subjects:	no entry
Uncontrolled Keywords:	Keywords Language RAMAN-SCATTERING; SPECTRA; SUPERCONDUCTIVITY; PEROVSKITES; LA2CUO4; LAMNO3; STATE Multiple languages Physics, Multidisciplinary Multiple languages
URI:	http://kups.ub.uni-koeln.de/id/eprint/38997