TY - JOUR
T1 - Mesoscopic effect observed in strong correlated electron materials
AU - Kashiwaya, H.
AU - Sawa, A.
AU - Kashiwaya, S.
AU - Kurosawa, I.
AU - Tsuchiura, H.
AU - Tanaka, Y.
PY - 2002/10/1
Y1 - 2002/10/1
N2 - The conductance spectra in YBa2Cu3O7-δ/La0.67Sr0.33 MnO3 (YBCO/LSMO) tunnel junctions are studied in ultra-low-temperature region in order to clarify the influences of strong correlation on transport. The conductance spectra vary from usual Blonder-Tinkham-Klapwijk type to phase coherent transport as the junction size becomes smaller. Conductance spectra obtained on small junctions (less than 15 × 15 μm2) show a periodic response to the applied magnetic field, which suggests the presence of the Aharanov-Bohm effect in the LSMO electrode. From these features, we conclude that the mesoscopic effect due to phase coherency of conducting electrons survives even in the strongly correlated electron system. Estimated phase coherence length lφ of LSMO is between 0.19 and 9 μm at 150 mK.
AB - The conductance spectra in YBa2Cu3O7-δ/La0.67Sr0.33 MnO3 (YBCO/LSMO) tunnel junctions are studied in ultra-low-temperature region in order to clarify the influences of strong correlation on transport. The conductance spectra vary from usual Blonder-Tinkham-Klapwijk type to phase coherent transport as the junction size becomes smaller. Conductance spectra obtained on small junctions (less than 15 × 15 μm2) show a periodic response to the applied magnetic field, which suggests the presence of the Aharanov-Bohm effect in the LSMO electrode. From these features, we conclude that the mesoscopic effect due to phase coherency of conducting electrons survives even in the strongly correlated electron system. Estimated phase coherence length lφ of LSMO is between 0.19 and 9 μm at 150 mK.
KW - Mesoscopic effect
KW - Phase coherent transport
KW - YBCO
KW - Zero-bias anomaly
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U2 - 10.1016/S0921-4534(02)01446-6
DO - 10.1016/S0921-4534(02)01446-6
M3 - Article
AN - SCOPUS:0036789077
SN - 0921-4534
VL - 378-381
SP - 364
EP - 367
JO - Physica C: Superconductivity and its Applications
JF - Physica C: Superconductivity and its Applications
IS - PART 1
ER -