Multicritical end point of the first-order ferromagnetic transition in colossal magnetoresistive manganites

  • We have studied the bandwidth–temperature–magnetic-field phase diagram of RE0.55Sr0.45MnO3 colossal magnetoresistance manganites with ferromagnetic metal (FM) ground state. The bandwidth was controlled both via chemical substitution and hydrostatic pressure with a focus on the vicinity of the critical pressure p∗ where the character of the zero-field FM transition changes from first to second order. Below p∗ the first-order FM transition extends up to a critical magnetic field. It approaches zero on the larger bandwidth side where the surface of the first-order FM phase boundary is terminated by a multicritical end point. The change in the character of the transition and the decrease of the colossal magnetoresistance effect is attributed to the reduced charge-order and orbital-order fluctuations.

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Author:L. Demkó, István KézsmárkiORCiDGND, G. Mihály, N. Takeshita, Y. Tomioka, Y. Tokura
Frontdoor URL
Parent Title (English):Physical Review Letters
Publisher:American Physical Society (APS)
Year of first Publication:2008
Publishing Institution:Universität Augsburg
Release Date:2018/11/19
First Page:037206
Institutes:Mathematisch-Naturwissenschaftlich-Technische Fakultät
Mathematisch-Naturwissenschaftlich-Technische Fakultät / Institut für Physik
Mathematisch-Naturwissenschaftlich-Technische Fakultät / Institut für Physik / Lehrstuhl für Experimentalphysik V
Dewey Decimal Classification:5 Naturwissenschaften und Mathematik / 53 Physik / 530 Physik
Licence (German):Deutsches Urheberrecht