Vanishingly small Maki-Thompson superconducting fluctuation in the magnetoresistance of high-Tc superconductors

Kouichi Semba, Azusa Matsuda

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23 Citations (Scopus)

Abstract

The magnetoresistance (MR) of high-Tc cuprate superconductors (HTSC's) is studied. We have shown that the Zeeman term of the Maki-Thompson (MT) process could not be detected in the longitudinal MR of 90 K YBCO crystals. We show here that the MT process is thought to be also negligible in the transverse MR of 90 K and Zn-doped YBCO crystals. The MR, which has been assigned previously to a MT-orbital process, is more naturally understood as normal-state orbital MR that is proportional to the square of the Hall angle. We conclude that the MT-fluctuation is vanishingly small, at least above Tc, in these HTSC's. In addition to the Hall measurements, MR measurements also support the hypothesis of two distinct relaxation times in HTSC's.

Original languageEnglish
Pages (from-to)11103-11106
Number of pages4
JournalPhysical Review B - Condensed Matter and Materials Physics
Volume55
Issue number17
Publication statusPublished - 1997 May 1
Externally publishedYes

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Magnetoresistance
cuprates
Superconducting materials
orbitals
crystals
relaxation time
Crystals
Relaxation time
Cuprate superconductors

ASJC Scopus subject areas

  • Condensed Matter Physics

Cite this

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abstract = "The magnetoresistance (MR) of high-Tc cuprate superconductors (HTSC's) is studied. We have shown that the Zeeman term of the Maki-Thompson (MT) process could not be detected in the longitudinal MR of 90 K YBCO crystals. We show here that the MT process is thought to be also negligible in the transverse MR of 90 K and Zn-doped YBCO crystals. The MR, which has been assigned previously to a MT-orbital process, is more naturally understood as normal-state orbital MR that is proportional to the square of the Hall angle. We conclude that the MT-fluctuation is vanishingly small, at least above Tc, in these HTSC's. In addition to the Hall measurements, MR measurements also support the hypothesis of two distinct relaxation times in HTSC's.",
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N2 - The magnetoresistance (MR) of high-Tc cuprate superconductors (HTSC's) is studied. We have shown that the Zeeman term of the Maki-Thompson (MT) process could not be detected in the longitudinal MR of 90 K YBCO crystals. We show here that the MT process is thought to be also negligible in the transverse MR of 90 K and Zn-doped YBCO crystals. The MR, which has been assigned previously to a MT-orbital process, is more naturally understood as normal-state orbital MR that is proportional to the square of the Hall angle. We conclude that the MT-fluctuation is vanishingly small, at least above Tc, in these HTSC's. In addition to the Hall measurements, MR measurements also support the hypothesis of two distinct relaxation times in HTSC's.

AB - The magnetoresistance (MR) of high-Tc cuprate superconductors (HTSC's) is studied. We have shown that the Zeeman term of the Maki-Thompson (MT) process could not be detected in the longitudinal MR of 90 K YBCO crystals. We show here that the MT process is thought to be also negligible in the transverse MR of 90 K and Zn-doped YBCO crystals. The MR, which has been assigned previously to a MT-orbital process, is more naturally understood as normal-state orbital MR that is proportional to the square of the Hall angle. We conclude that the MT-fluctuation is vanishingly small, at least above Tc, in these HTSC's. In addition to the Hall measurements, MR measurements also support the hypothesis of two distinct relaxation times in HTSC's.

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