Mesoscopic effect observed in strong correlated electron materials

H. Kashiwaya; A. Sawa; S. Kashiwaya; I. Kurosawa; H. Tsuchiura; Y. Tanaka

doi:10.1016/S0921-4534(02)01446-6

Mesoscopic effect observed in strong correlated electron materials

H. Kashiwaya, A. Sawa, S. Kashiwaya, I. Kurosawa, H. Tsuchiura, Y. Tanaka

Research output: Contribution to journal › Article

2 Citations (Scopus)

Abstract

The conductance spectra in YBa₂Cu₃O_7-δ/La_0.67Sr_0.33MnO₃ (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 l_φ of LSMO is between 0.19 and 9 μm at 150 mK.

Original language	English
Pages (from-to)	364-367
Number of pages	4
Journal	Physica C: Superconductivity and its applications
Volume	378-381
Issue number	PART 1
DOIs	https://doi.org/10.1016/S0921-4534(02)01446-6
Publication status	Published - 2002 Oct 1
Externally published	Yes

Keywords

Mesoscopic effect
Phase coherent transport
YBCO
Zero-bias anomaly

ASJC Scopus subject areas

Electronic, Optical and Magnetic Materials
Condensed Matter Physics
Energy Engineering and Power Technology
Electrical and Electronic Engineering

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10.1016/S0921-4534(02)01446-6

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title = "Mesoscopic effect observed in strong correlated electron materials",

abstract = "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.",

keywords = "Mesoscopic effect, Phase coherent transport, YBCO, Zero-bias anomaly",

author = "H. Kashiwaya and A. Sawa and S. Kashiwaya and I. Kurosawa and H. Tsuchiura and Y. Tanaka",

year = "2002",

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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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JO - Physica C: Superconductivity and its Applications

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IS - PART 1

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