Physics – Condensed Matter – Disordered Systems and Neural Networks
Scientific paper
2005-03-31
Europhys. Lett. vol 71, 804 (2005)
Physics
Condensed Matter
Disordered Systems and Neural Networks
Final published version
Scientific paper
10.1209/epl/i2005-10155-6
We present microscopic results on the giant tunneling magnetoresistance that arises from the nanoscale coexistence of ferromagnetic metallic (FMM) and antiferromagnetic insulating (AFI) clusters in a disordered two dimensional electron system with competing double exchange and superexchange interactions. Our Monte Carlo study allows us to map out the different field regimes in magnetotransport and correlate it with the evolution of spatial structures. At coexistence, the isotropic O(3) model shows signs of slow relaxation, and has a high density of low energy metastable states, but no genuine glassiness. However, in the presence of weak magnetic anisotropy, and below a field dependent irreversibility temperature $T_{irr}$, the response on field cooling (FC) differs distinctly from that on zero field cooling (ZFC). We map out the phase diagram of this `phase coexistence glass', highlight how its response differs from that of a standard spin glass, and compare our results with data on the manganites.
Kumar Sanjeev
Majumdar Pinaki
Mohapatra Chandra Shekhar
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