Phys. Rev. B 67, 024517 (2003) [6 pages]Phonon structure in I-V characteristic of MgB2 point contactsReceived 13 June 2002; revised 13 August 2002; published 31 January 2003 A search of the phonon structure at the above-gap energies was carried out for d2V/dI2(V) spectra of MgB2 point contacts with a normal metal. The two-band model is assumed not only for the gap structure in dV/dI(V) characteristics, but also for phonons in d2V/dI2(V) point-contact spectra, with up to the maximum lattice vibration energy. Since the current is carried mostly by charges of the three-dimensional (3D) band (π band), whereas the strong electron-phonon interaction occurs in 2D band (σ band), we observe the phonon peculiarities due to the “proximity” effect in k space, which depends on both the contact orientation with respect to the crystal axes and the variation of interband coupling through the elastic scattering. © 2003 The American Physical Society URL:
http://link.aps.org/doi/10.1103/PhysRevB.67.024517
DOI:
10.1103/PhysRevB.67.024517
PACS:
74.25.Fy, 74.45.+c, 73.40.Jn
|
|
About | Terms and Conditions | Subscriptions | Search | Help
Use of the American Physical Society websites and journals implies that the user has read and agrees to our Terms and Conditions and any applicable Subscription Agreement. Physical Review®, Physical Review Letters®, Reviews of Modern Physics®, and Physical Review Special Topics® are trademarks of the American Physical Society.