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Materials 286K Class 07. The rare-earth manganese oxides: M–I transitions, CMR, charge-ordering Jonker, van Santen, Physica 16 (1950)

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Presentation on theme: "Materials 286K Class 07. The rare-earth manganese oxides: M–I transitions, CMR, charge-ordering Jonker, van Santen, Physica 16 (1950)"— Presentation transcript:

1 Materials 286K Class 07. The rare-earth manganese oxides: M–I transitions, CMR, charge-ordering Jonker, van Santen, Physica 16 (1950) 337–349. La 1–x Ca x MnO 3 ; Saturation magnetization at 90 K.

2 Materials 286K Class 07. The rare-earth manganese oxides: M–I transitions, CMR, charge-ordering Jonker, van Santen, Physica 16 (1950) 559–560. La 1–x Ca x MnO 3 Resistivity at 100 K on right. Metallic behavior corresponds to ferromagnetism.

3 Materials 286K Class 07. The rare-earth manganese oxides: M–I transitions, CMR, charge-ordering Crystal fields and Jahn-Teller

4 Materials 286K Class 07. The rare-earth manganese oxides: M–I transitions, CMR, charge-ordering Zener, Phys. Rev. 82 (1951) 403–405. Metallic behavior corresponds to ferromagnetism and vice-versa. Mn 3+ Mn 4+

5 Materials 286K Class 07. The rare-earth manganese oxides: M–I transitions, CMR, charge-ordering deGennes, Phys. Rev. 118 (1960) 141–153. Further theory by deGennes: Explanation of canted phases, antiferromagnets, etc.

6 Materials 286K Class 07. The rare-earth manganese oxides: M–I transitions, CMR, charge-ordering von Helmholt, Wecker, Holzapfel, Schultz, Samwer, Phys. Rev. Lett. 71 (1993) 2331–2333. The resurgence of interest: Giant negative magnetoresistance in (La,Ba)MnO 3 thin films.

7 Materials 286K Class 07. The rare-earth manganese oxides: M–I transitions, CMR, charge-ordering Jin, Tiefel, McCormack, Fastnacht, Ramesh, Chen, Science 264 (1994) 413–415. The resurgence of interest: Giant negative magnetoresistance in (La,Ca)MnO 3 thin films. “Thousandfold change”

8 Materials 286K Class 07. The rare-earth manganese oxides: M–I transitions, CMR, charge-ordering Hwang, Cheong, Radaelli, Marezio, Batlogg, Phys. Rev. Lett. 75 (1995) 914–917. The effect of the lattice:

9 Materials 286K Class 07. The rare-earth manganese oxides: M–I transitions, CMR, charge-ordering Rodriguez-Martinez, Attfield, Phys. Rev. B. 54 (1996) R15622–R More lattice effects. Strain and local perturbations of the bandwith.

10 Materials 286K Class 07. The rare-earth manganese oxides: M–I transitions, CMR, charge-ordering Millis, Shraiman, Littlewood, Phys. Rev. Lett. 54 (1995) 5144–5147. The effect of a magnetic field is to melt a polaron solid (glass).

11 Materials 286K Class 07. The rare-earth manganese oxides: M–I transitions, CMR, charge-ordering Mazumdar, Littlewood, Nature 395 (1998) 479–481. Negative magnetoresistance is quite a general phenomena, associated with spin-dependent scattering.

12 Materials 286K Class 07. The rare-earth manganese oxides: M–I transitions, CMR, charge-ordering Tokura, Rep. Prog. Phys. 69 (2006) 797–851. The complete phase diagrams are quite complex. Especially interesting things happen near x = 0.5 in RE 1–x A x MnO 3

13 Materials 286K Class 07. The rare-earth manganese oxides: M–I transitions, CMR, charge-ordering Tokura, Rep. Prog. Phys. 69 (2006) 797–851. The CE-type antiferromagnetic model of Goodenough for simultaneous charge-spin-orbital ordering.

14 Materials 286K Class 07. The rare-earth manganese oxides: M–I transitions, CMR, charge-ordering Tokura, Rep. Prog. Phys. 69 (2006) 797–851. The complete phase diagram for prototypic manganites.

15 Materials 286K Class 07. The rare-earth manganese oxides: M–I transitions, CMR, charge-ordering Tokura, Rep. Prog. Phys. 69 (2006) 797–851. The complete phase diagram for prototypic manganites.

16 Materials 286K Class 07. The rare-earth manganese oxides: M–I transitions, CMR, charge-ordering Tokura, Rep. Prog. Phys. 69 (2006) 797–851. The complete phase diagram for prototypic manganites.

17 Materials 286K Class 07. The rare-earth manganese oxides: M–I transitions, CMR, charge-ordering Mori, Chen, Cheong, Nature 392 (1998) 473–476. Visualizing charge order: La 2/3 Ca 1/3 MnO 3

18 Materials 286K Class 07. The rare-earth manganese oxides: M–I transitions, CMR, charge-ordering Mori, Chen, Cheong, Nature 392 (1998) 473–476. Visualizing charge order: La 1/4 Ca 3/4 MnO 3

19 Materials 286K Class 07. The rare-earth manganese oxides: M–I transitions, CMR, charge-ordering Rodriguez, Proffen, Llobet, Rhyne, Mitchell, Phys. Rev. B 71 (2005) (1–9). Determining charge-ordering and magnetic structure in La 1/2 Ca 1/2 MnO 3

20 Materials 286K Class 07. The rare-earth manganese oxides: M–I transitions, CMR, charge-ordering Rodriguez, Proffen, Llobet, Rhyne, Mitchell, Phys. Rev. B 71 (2005) (1–9). Determining charge-ordering and magnetic structure in La 1/2 Ca 1/2 MnO 3

21 Materials 286K Class 07. The rare-earth manganese oxides: M–I transitions, CMR, charge-ordering Dimensionality control Kimura, Tokura, Annu. Rev. Mater. Res. 30 (2000) 451–474.

22 Materials 286K Class 07. The rare-earth manganese oxides: M–I transitions, CMR, charge-ordering Kimura, Tokura, Annu. Rev. Mater. Res. 30 (2000) 451–474. Dimensionality control: La 2–2x Sr 1+2x Mn 2 O 7


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