Physcial Properties of SuperconductorNo Access

TUNNELING SPECTROSCOPY OF TRILAYER HIGH-T_C CUPRATE, TlBa₂Ca₂Cu₂O_10-δ

The Center of General Education and Humanity, Tokyo University of Science, Suwa, 5000-1 Toyohira, Chino, Nagano 391-0292, Japan

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K. TOKIWA

Department of Applied Electronics, Tokyo University of Science, 2641 Yamazaki, Noda, Chiba 278-8510, Japan

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S. MIKUSU

Department of Applied Electronics, Tokyo University of Science, 2641 Yamazaki, Noda, Chiba 278-8510, Japan

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T. WATANABE

Department of Applied Electronics, Tokyo University of Science, 2641 Yamazaki, Noda, Chiba 278-8510, Japan

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A. IYO

National Institute of Advanced Industrial Science and Technology (AIST), Central 2, Tsukuba, Ibaraki 305-8568, Japan

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J. F. ZASADZINSKI

Physics Division, Illinois Institute of Technology, Chicago, IL 60616, USA

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, and

T. KANEKO

Department of Applied Physics, Tokyo University of Science, 1-3 Kagurazaka, Shinjuku-ku, Tokyo 162-8601, Japan

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https://doi.org/10.1142/S0217979205028281Cited by:14 (Source: Crossref)

Abstract

We present point contact tunneling spectroscopy measured on TlBa₂Ca₂Cu₃O_10-δ (Tl1223) with three CuO₂ planes in a unit cell. Our samples of Tl1223 with T_c~91K are heavily overdoped at the outer CuO₂ planes (OP), but slightly underdoped at the inner CuO₂ planes (IP). The tunneling conductances on Tl1223 exhibit two kinds of gaps that originate from crystallographically inequivalent IP and OP. The overall spectral shape of tunneling conductance for Tl1223 is consistent with that observed on a bilayer Bi₂Sr₂CaCu₂O_8+δ, that is, unusual peak-dip-hump (PDH) structures are observed. The origin of PDH structures is controversial, but these results, especially, the observation of PDH for trilayer Tl1223 in which interlayer effects should be quite different from that in bilayer, put severe constraints on any theoretical model for the origin of these structures.

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