'工学部/工学系研究科 プレスリリース' blog (64135473799) of hub id 20511701

PRESS RELEASE

Discovery of "Devil's staircase" in cobalt oxides

 

Authors

T. Matsuda, T. Tsuyama, T. Saito, S. Ishiwata, Y. Tokura, H. Wadati

 

Abstract

Emergence of "Devil's staircase": Anomalous spin ordering revealed by brilliant synchrotron
x-ray.
Using resonant soft x-ray scattering as a function of both temperature and magnetic field,
we reveal a large number of almost degenerate magnetic orders in SrCo6O11. The Ising-like
spins in this frustrated material in fact exhibit a so-called magnetic devil's staircase.
It is demonstrated how a magnetic field induces transitions between different microscopic
spin configurations, which is responsible for the magnetoresistance of SrCo6O11.
This material therefore constitutes a unique combination of a magnetic devil's staircase and
spin valve effects, yielding a novel type of magnetoresistance system.

 
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