TY - JOUR
T1 - Electrical Resistance and Magnetoresistance in Quasi-Crystalline and Amorphous Al-Mn Alloys
AU - Toyota, Naoki
AU - Fukamichi, Kazuaki
AU - Inoue, Akihisa
AU - Matsuzaki, Kunio
AU - Masumoto, Tsuyoshi
PY - 1988/1/1
Y1 - 1988/1/1
N2 - Temperature and magnetic field dependences of the electrical resistance R(T, H) of a quasi-crystalline (QC) Al–22.5 at%Mn and its counterpart amorphous (AM) alloys have been studied. Little difference in R(T, H) between these two phases is observed accompanying the following common characteristics. The resistance in the absence of magnetic field has a – log T dependence which holds down to near the spin-glass freezing temperature Tf (8.5 K for QC, 7.4 K and 10 K for AM: Al–22.4 and –24.3 at%Mn, respectively). Below Tf, R(T) deviates downward from the –log T curve. A negative magnetoresistance is observed at low temperatures below 10 K and monotonically enhanced on cooling. These behaviors may be understood in terms of the Kondo effect in a spin-glass state.
AB - Temperature and magnetic field dependences of the electrical resistance R(T, H) of a quasi-crystalline (QC) Al–22.5 at%Mn and its counterpart amorphous (AM) alloys have been studied. Little difference in R(T, H) between these two phases is observed accompanying the following common characteristics. The resistance in the absence of magnetic field has a – log T dependence which holds down to near the spin-glass freezing temperature Tf (8.5 K for QC, 7.4 K and 10 K for AM: Al–22.4 and –24.3 at%Mn, respectively). Below Tf, R(T) deviates downward from the –log T curve. A negative magnetoresistance is observed at low temperatures below 10 K and monotonically enhanced on cooling. These behaviors may be understood in terms of the Kondo effect in a spin-glass state.
KW - Kondo effect
KW - amorphous Al–Mn alloy
KW - electrical resistance
KW - magnetoresistance
KW - quasi-crystalline Al–Mn
KW - spin glass
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U2 - 10.1143/JPSJ.57.1724
DO - 10.1143/JPSJ.57.1724
M3 - Article
AN - SCOPUS:0005513687
VL - 57
SP - 1724
EP - 1728
JO - Journal of the Physical Society of Japan
JF - Journal of the Physical Society of Japan
SN - 0031-9015
IS - 5
ER -