1 / 35

Colossal Magnetoresistance in Metals: a Miracle?

Colossal Magnetoresistance in Metals: a Miracle?. Jiunn-Yuan Lin. Giant Magnetoresistance in Metals: a Miracle?. Jiunn-Yuan Lin. Collabrations. W. J. Chang, S. W. Huang, T.-Y. Chung, S. Y. Hsu, and J.-Y. Juang Department of Electrophysics, NCTU H. T. Jeng

siusan
Download Presentation

Colossal Magnetoresistance in Metals: a Miracle?

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

  1. Colossal Magnetoresistance in Metals: a Miracle? Jiunn-Yuan Lin

  2. Giant Magnetoresistance in Metals: a Miracle? Jiunn-Yuan Lin

  3. Collabrations W. J. Chang, S. W. Huang, T.-Y. Chung, S. Y. Hsu, and J.-Y. Juang • Department of Electrophysics, NCTU H. T. Jeng • Institute of Physics, Academia Sinica C. P. Sun, and H. D. Yang • Department of Physics, NSYUS H. Berger • Institute of Physics of Complex Matter, EPFL, Lausanne, Switzerland J. M. Chen, and K. Liang • NSRRC

  4. Subbayah Pullavar photo by P. Y. Plunkett (June 6, 1936)

  5. Experiment result H. Berger (Department of Physics, EPF Lausanne, CH-1015 Lausanne, Switzerland).

  6. Atomic coordinates (x 104)--295K x y z _________________________ Re 2500 7500 5000 Cd 5000 5000 5000 O(1) 3152(9) 6250 6250 O(2) 6250 6250 6250 __________________________ Atomic coordinates (x104) –160K x y z ________________________________ Re 2471(2) 0 8729(2) Cd 0 2471(4) 6259(3) O11 3059(15) 1941(15) 7500 O12 0 0 8026(16) O13 1889(16) 1889(16) 10000 O14 5000 0 9317(19) O21 0 0 5000 O22 0 5000 7500 ________________________________ Atomic coordinate (x104) – 90K x y z _______________________________ Re 2500 -33(3) 8750 Cd 5041(6) 2500 11250 O11 1880(20) 1880(20) 10000 O12 5000 0 9396(14) O13 1970(20) -1970(20) 10000 O2 5000 5000 10000 _______________________________ Single Crystal X-ray diffraction Space group: Fd-3m for high I4-m2 for middle I4122 for low

  7. Crystal Structure Intermediate temperature & low temperature High temperature

  8. Baibichi et al., PRL (1988)

  9. “simple” metals in the magnetic fields

  10. The two band model for magnetoresistance

  11. Band Structure 2002 D. J. Singh et al (PRB vol. 65 155109) VASP GGA-PAW-SO-666

  12. 2002 H. Harima (Jon. Of Phys. and Chem.Solid)

  13. X-files • Mulder: Scully, would you be afraid if there is no God? • Scully: What I am afraid is: God is talking to us, but nobody is listening.

  14. There are indeed miracles around us (and in the labs). • The question is : did you notice?

More Related