Multicritical end point of the first-order ferromagnetic transition in colossal magnetoresistive manganites.
Phys Rev Lett
; 101(3): 037206, 2008 Jul 18.
Article
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| MEDLINE
| ID: mdl-18764288
ABSTRACT
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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Base de datos:
MEDLINE
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En
Revista:
Phys Rev Lett
Año:
2008
Tipo del documento:
Article