Carrier density variation in films of

P. Wagner; I. Gordon; A. Vantomme; D. Dierickx; M. J. Van Bael; V. V. Moshchalkov; Y. Bruynseraede

doi:10.1209/epl/i1998-00114-3

All issues

Volume 41 / No 1 (January I 1998)

Europhys. Lett., 41 1 (1998) 49-54

Abstract

Issue		Europhys. Lett. Volume 41, Number 1, January I 1998


Page(s)		49 - 54
Section		Condensed matter: electronic structure, electrical, magnetic and optical properties
DOI		https://doi.org/10.1209/epl/i1998-00114-3
Published online		01 September 2002

Europhys. Lett., 41 (1), pp. 49-54 (1998)

Carrier density variation in films of $\rm Nd_{0.5} Sr_{0.5}MnO_3$

P. Wagner¹, I. Gordon¹, A. Vantomme², D. Dierickx¹, M. J. Van Bael¹, V. V. Moshchalkov¹ and Y. Bruynseraede¹

¹ Laboratorium voor Vaste-Stoffysica en Magnetisme, Katholieke Universiteit Leuven Celestijnenlaan 200 D, 3001 Leuven, Belgium
² Instituut voor Kern- en Stralingsfysica, Katholieke Universiteit Leuven Celestijnenlaan 200 D, 3001 Leuven, Belgium

Received: 8 August 1997
Accepted: 14 November 1997

Abstract

The carrier density in thin films of $\rm Nd_{0.5} Sr_{0.5} MnO_3$ , as derived from Hall measurements, shows a distinct change at the paramagnetic (PM)-ferromagnetic (FM) transition around $T_{\rm C} = 225~{\rm K}$ . In the PM-semiconducting regime the density is n = 0.30 holes per unit cell and increases in the FM-semimetallic regime to n = 0.49. The magnetoresistance effect in the semimetallic phase is due to a field-induced increase of the carrier mobility, while the carrier density is unaffected. In the low-field limit an extraordinary enhancement of the $\rho_{xy}(B)$ slope due to the anomalous Hall effect is observed. The spontaneous Hall resistivity $\rho_{xy}^\star$ , reflecting the strength of the asymmetric scattering between carriers and localized magnetic moments, is linked to the zero-field resistivity $\rho_{xx}$ via $\rho_{xy}^\star \propto \rho_{xx}^{1.74}$ .

PACS: 73.50.Jt – Galvanomagnetic and other magnetotransport effects (including thermomagnetic effects) / 75.70.Ak – Magnetic properties of monolayers and thin films / 75.70.Pa – Giant magnetoresistance

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