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Condensed Matter Seminars

ics Condensed Matter
Thursday, April 27, 2017
11:00 AM
Physics Building, Room 313
Boris I. Ivlev [Host: Genya Kolomeisky]
Landau Institute and Instituto de Fisica, UASLP
"SUBATOMIC STATES IN CONDENSED MATTER AND MAGNETORESISTANCE OF SUPERCONDUCTORS"
ABSTRACT:

In the recent experiments, PRB 94, 054504 (2016), the unusual oscillatory magnetore- sistance of superconductors was discovered with a periodicity essentially independent on magnetic field direction and even material parameters. The nearly universal period points to a subatomic mechanism of the phenomenon. This mechanism is related to formation inside samples of subatomically thin (1011cm size) threads in the form of rings of the interatomic radius. Electron states of rings go over into conduction electrons which carry the same spin imbalance in energy as the ring. The imbalance occurs due to the spin interaction with the orbital momentum of the ring. The conductivity neat Tc is determined by fluctuating Cooper pairs consisting of electrons with shifted energies. Due to different angular momenta of rings these energies periodically depend on magnetic field resulting in the observed oscil- latory magnetoresistance. Calculated universal positions of peaks (n + 1)∆H (∆H '"" 0.18T and n = 0, 1, 2, ...) on the R(H) curve are in a good agreement with measurements.

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