Spectroscopy of quasiparticle excitations of superconducting bismuth cuprate at high pressures

V. M. Svistunov; V. Yu Tarenkov; A. I. D'yachenko; R. Aoku; H. Murakami; M. Shirai

doi:10.1134/1.558537

Spectroscopy of quasiparticle excitations of superconducting bismuth cuprate at high pressures

V. M. Svistunov, V. Yu Tarenkov, A. I. D'yachenko, R. Aoku, H. Murakami, M. Shirai

RIEC - Computing System Platforms Division

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Abstract

We study the energy spectrum of Bi2223 (Bi_1.6Pb_0.4Sr_1.8Ca_2.2Cu ₃O_x) at high hydrostatic pressures by Andreev- and tunneling-spectroscopy methods. We determine the gap anisotropy in the basal ab plane and find the following values for the parameters Δ(φ): Δ_max=42mV, and Δ_min= 19.5 mV (T_c = 110 K and dT_c/dP = 0.16 K/kbar). We detect an increase in the ratio R = 2Δ_max/kT_c with pressure P; for Bi2223 cuprate, dR/dP≈0.017 kbar^-1. In the phonon-frequency region we detect a "softening," due to pressure, of the high-frequency part of the phonon spectrum corresponding to "breathing" modes of oxygen, as well as other optical modes of Cu-O. The characteristic frequencies of the spectrum for ℏΩ>60 mV are found to decrease, with increasing pressure, at a rate d ln(ℏΩ)/dP≈-6.5±0.5×10^-3 kbar^-1. This result explains the observed increase in the ratio 2Δ/kT_c(P) in the model of strong electron-phonon interaction.

Original language	English
Pages (from-to)	763-770
Number of pages	8
Journal	Journal of Experimental and Theoretical Physics
Volume	86
Issue number	4
DOIs	https://doi.org/10.1134/1.558537
Publication status	Published - 1998 Apr

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@article{ba3c79b689b041d1ae3734bfd4da8033,

title = "Spectroscopy of quasiparticle excitations of superconducting bismuth cuprate at high pressures",

abstract = "We study the energy spectrum of Bi2223 (Bi1.6Pb0.4Sr1.8Ca2.2Cu 3Ox) at high hydrostatic pressures by Andreev- and tunneling-spectroscopy methods. We determine the gap anisotropy in the basal ab plane and find the following values for the parameters Δ(φ): Δmax=42mV, and Δmin= 19.5 mV (Tc = 110 K and dTc/dP = 0.16 K/kbar). We detect an increase in the ratio R = 2Δmax/kTc with pressure P; for Bi2223 cuprate, dR/dP≈0.017 kbar-1. In the phonon-frequency region we detect a {"}softening,{"} due to pressure, of the high-frequency part of the phonon spectrum corresponding to {"}breathing{"} modes of oxygen, as well as other optical modes of Cu-O. The characteristic frequencies of the spectrum for ℏΩ>60 mV are found to decrease, with increasing pressure, at a rate d ln(ℏΩ)/dP≈-6.5±0.5×10-3 kbar-1. This result explains the observed increase in the ratio 2Δ/kTc(P) in the model of strong electron-phonon interaction.",

author = "Svistunov, {V. M.} and Tarenkov, {V. Yu} and D'yachenko, {A. I.} and R. Aoku and H. Murakami and M. Shirai",

note = "Funding Information: The work was supported by a grant from the Telecommunications Advancement Organization of Japan.",

year = "1998",

month = apr,

doi = "10.1134/1.558537",

language = "English",

volume = "86",

pages = "763--770",

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T1 - Spectroscopy of quasiparticle excitations of superconducting bismuth cuprate at high pressures

AU - Svistunov, V. M.

AU - Tarenkov, V. Yu

AU - D'yachenko, A. I.

AU - Aoku, R.

AU - Murakami, H.

AU - Shirai, M.

N1 - Funding Information: The work was supported by a grant from the Telecommunications Advancement Organization of Japan.

PY - 1998/4

Y1 - 1998/4

N2 - We study the energy spectrum of Bi2223 (Bi1.6Pb0.4Sr1.8Ca2.2Cu 3Ox) at high hydrostatic pressures by Andreev- and tunneling-spectroscopy methods. We determine the gap anisotropy in the basal ab plane and find the following values for the parameters Δ(φ): Δmax=42mV, and Δmin= 19.5 mV (Tc = 110 K and dTc/dP = 0.16 K/kbar). We detect an increase in the ratio R = 2Δmax/kTc with pressure P; for Bi2223 cuprate, dR/dP≈0.017 kbar-1. In the phonon-frequency region we detect a "softening," due to pressure, of the high-frequency part of the phonon spectrum corresponding to "breathing" modes of oxygen, as well as other optical modes of Cu-O. The characteristic frequencies of the spectrum for ℏΩ>60 mV are found to decrease, with increasing pressure, at a rate d ln(ℏΩ)/dP≈-6.5±0.5×10-3 kbar-1. This result explains the observed increase in the ratio 2Δ/kTc(P) in the model of strong electron-phonon interaction.

AB - We study the energy spectrum of Bi2223 (Bi1.6Pb0.4Sr1.8Ca2.2Cu 3Ox) at high hydrostatic pressures by Andreev- and tunneling-spectroscopy methods. We determine the gap anisotropy in the basal ab plane and find the following values for the parameters Δ(φ): Δmax=42mV, and Δmin= 19.5 mV (Tc = 110 K and dTc/dP = 0.16 K/kbar). We detect an increase in the ratio R = 2Δmax/kTc with pressure P; for Bi2223 cuprate, dR/dP≈0.017 kbar-1. In the phonon-frequency region we detect a "softening," due to pressure, of the high-frequency part of the phonon spectrum corresponding to "breathing" modes of oxygen, as well as other optical modes of Cu-O. The characteristic frequencies of the spectrum for ℏΩ>60 mV are found to decrease, with increasing pressure, at a rate d ln(ℏΩ)/dP≈-6.5±0.5×10-3 kbar-1. This result explains the observed increase in the ratio 2Δ/kTc(P) in the model of strong electron-phonon interaction.

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Spectroscopy of quasiparticle excitations of superconducting bismuth cuprate at high pressures

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