Correlations between pressure and bandwidth effects in metal–insulator transitions in manganites
نویسندگان
چکیده
The effect of pressure on the metal–insulator transition in manganites with a broad range of bandwidths is investigated. A critical pressure is found at which the metal–insulator transition temperature, TMI , reaches a maximum value in every sample studied. The origin of this universal pressure and the relation between the pressure effect and the bandwidth on the metal–insulator transition are discussed. © 2004 American Institute of Physics. @DOI: 10.1063/1.1646212#
منابع مشابه
Competition between the double exchange and charge ordering interactions in the bandwidth controlled ðLa;NdÞ0:8Na0:2MnO3 manganites
Structural, magnetic, and transport properties of ðLa1 xNdxÞ0:8Na0:2MnO3 ð0pxp1Þ are studied. The system exhibits a rhombohedrally distorted perovskite structure for xp0:2 and it converts to an orthorhombic structure for xX0:4: Re-entrant ferromagnetic-type charge ordering transitions are observed in the narrow bandwidth samples ðxX0:8Þ: For T > 77 K; the compounds show metal to insulator trans...
متن کاملخواص ساختاری، الکتریکی و مغناطیسی منگنایتLa1-xCaxMnO3
Manganites are considered as subbranches of condensed matter physics with a great wealth of physical mechanisms. In this investigation we have studied the structural, electrical and magnetic properties of a series of La1-xCaxMnO3 manganite with x=0.1, 0.2, …,0.5. We observed that the crystal structure of this manganite, with small dopping, at room temperature is orthorhombic and by increasi...
متن کاملCompetition between the charge ordered and ferromagnetic states in (La,Nd)0.75Na0.25MnO3 manganites
Structural, magnetic, and transport properties of (La1−xNdx )0.75Na0.25MnO3 (0 x 1) are studied. The system exhibits a rhombohedrally distorted perovskite structure for x 0.2 and it convert to an orthorhombic structure for x 0.4. Re-entrant ferromagnetic type charge ordering transitions are observed in the narrow bandwidth samples (x 0.6), while charge ordering transition is not observed for th...
متن کاملField Induced Transition from Metal to Insulator in the CMR Manganites
The gigantic reduction of the electric resistivity under the applied magnetic field, CMR effect, is now widely accepted to appear in the vicinity of the insulator to metal transition of the perovskite manganites. Recently, we have discovered the first order transition from ferromagnetic metal to insulator in La0.88Sr0.12MnO3 of the CMR manganite. This phase transition induces the tremendous inc...
متن کاملReemergent metal-insulator transitions in manganites exposed with spatial confinement.
The metal-insulator transition is characterized as a single peak in the temperature-dependent resistivity measurements; exceptions to this have never been seen in any single crystal material system. We show that by reducing a single crystal manganite thin film to a wire with a width comparable to the mesoscopic phase-separated domains inherent in the material, a second and robust metal-insulato...
متن کامل