Microwave low-field absorption and ESR in Kx(C60)1-y(C70)y and KxC70

A. A. Zakhidov, K. Imaeda, A. Ugawa, K. Yakushi, H. Inokuchi, Z. Iqbal, R. H. Baughman, B. I. Ramakrishna, Y. Achiba

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Abstract

Superconductivity (SC) in K-doped molecular alloys of C60 and C70 are studied by means of the nonresonant microwave low-field signal (LFS) and conventional ESR, and a LFS-search for SC in KxC70 is performed. The critical temperature of Kx(C60/C70) determined at the onset of hysteretic LFS, decreases to Tc=16K (at about 10% C70), and Tc=10K (at about 25% C70), compared with Tc=19K in pure KxC60 suggesting the decrease of electron-phonon coupling. A strong multicomponent g=2 ESR signal appears and coexists with LFS at low T for SC composition of Kx(C60/C70) indicating presence of a non-SC metallic phase. At overdoping LFS disappears and a single ESR line is enormously broadened to Δ Hpp(300K) = 80G. In KxC70 doped under the same conditions the LFS is not detected, indicating absence of SC above 5K, while a narrow ESR single line appears.

Original languageEnglish (US)
Pages (from-to)411-412
Number of pages2
JournalPhysica C: Superconductivity and its Applications
Volume185-189
Issue numberPART 1
DOIs
StatePublished - Dec 1 1991

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Superconductivity
Paramagnetic resonance
Microwaves
microwaves
superconductivity
Electrons
Chemical analysis
critical temperature
Temperature
electrons

ASJC Scopus subject areas

  • Condensed Matter Physics

Cite this

Zakhidov, A. A., Imaeda, K., Ugawa, A., Yakushi, K., Inokuchi, H., Iqbal, Z., ... Achiba, Y. (1991). Microwave low-field absorption and ESR in Kx(C60)1-y(C70)y and KxC70. Physica C: Superconductivity and its Applications, 185-189(PART 1), 411-412. https://doi.org/10.1016/0921-4534(91)92008-Y

Microwave low-field absorption and ESR in Kx(C60)1-y(C70)y and KxC70. / Zakhidov, A. A.; Imaeda, K.; Ugawa, A.; Yakushi, K.; Inokuchi, H.; Iqbal, Z.; Baughman, R. H.; Ramakrishna, B. I.; Achiba, Y.

In: Physica C: Superconductivity and its Applications, Vol. 185-189, No. PART 1, 01.12.1991, p. 411-412.

Research output: Contribution to journalArticle

Zakhidov, AA, Imaeda, K, Ugawa, A, Yakushi, K, Inokuchi, H, Iqbal, Z, Baughman, RH, Ramakrishna, BI & Achiba, Y 1991, 'Microwave low-field absorption and ESR in Kx(C60)1-y(C70)y and KxC70', Physica C: Superconductivity and its Applications, vol. 185-189, no. PART 1, pp. 411-412. https://doi.org/10.1016/0921-4534(91)92008-Y
Zakhidov AA, Imaeda K, Ugawa A, Yakushi K, Inokuchi H, Iqbal Z et al. Microwave low-field absorption and ESR in Kx(C60)1-y(C70)y and KxC70. Physica C: Superconductivity and its Applications. 1991 Dec 1;185-189(PART 1):411-412. https://doi.org/10.1016/0921-4534(91)92008-Y
Zakhidov, A. A. ; Imaeda, K. ; Ugawa, A. ; Yakushi, K. ; Inokuchi, H. ; Iqbal, Z. ; Baughman, R. H. ; Ramakrishna, B. I. ; Achiba, Y. / Microwave low-field absorption and ESR in Kx(C60)1-y(C70)y and KxC70. In: Physica C: Superconductivity and its Applications. 1991 ; Vol. 185-189, No. PART 1. pp. 411-412.
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abstract = "Superconductivity (SC) in K-doped molecular alloys of C60 and C70 are studied by means of the nonresonant microwave low-field signal (LFS) and conventional ESR, and a LFS-search for SC in KxC70 is performed. The critical temperature of Kx(C60/C70) determined at the onset of hysteretic LFS, decreases to Tc=16K (at about 10{\%} C70), and Tc=10K (at about 25{\%} C70), compared with Tc=19K in pure KxC60 suggesting the decrease of electron-phonon coupling. A strong multicomponent g=2 ESR signal appears and coexists with LFS at low T for SC composition of Kx(C60/C70) indicating presence of a non-SC metallic phase. At overdoping LFS disappears and a single ESR line is enormously broadened to Δ Hpp(300K) = 80G. In KxC70 doped under the same conditions the LFS is not detected, indicating absence of SC above 5K, while a narrow ESR single line appears.",
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AU - Inokuchi, H.

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AU - Baughman, R. H.

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N2 - Superconductivity (SC) in K-doped molecular alloys of C60 and C70 are studied by means of the nonresonant microwave low-field signal (LFS) and conventional ESR, and a LFS-search for SC in KxC70 is performed. The critical temperature of Kx(C60/C70) determined at the onset of hysteretic LFS, decreases to Tc=16K (at about 10% C70), and Tc=10K (at about 25% C70), compared with Tc=19K in pure KxC60 suggesting the decrease of electron-phonon coupling. A strong multicomponent g=2 ESR signal appears and coexists with LFS at low T for SC composition of Kx(C60/C70) indicating presence of a non-SC metallic phase. At overdoping LFS disappears and a single ESR line is enormously broadened to Δ Hpp(300K) = 80G. In KxC70 doped under the same conditions the LFS is not detected, indicating absence of SC above 5K, while a narrow ESR single line appears.

AB - Superconductivity (SC) in K-doped molecular alloys of C60 and C70 are studied by means of the nonresonant microwave low-field signal (LFS) and conventional ESR, and a LFS-search for SC in KxC70 is performed. The critical temperature of Kx(C60/C70) determined at the onset of hysteretic LFS, decreases to Tc=16K (at about 10% C70), and Tc=10K (at about 25% C70), compared with Tc=19K in pure KxC60 suggesting the decrease of electron-phonon coupling. A strong multicomponent g=2 ESR signal appears and coexists with LFS at low T for SC composition of Kx(C60/C70) indicating presence of a non-SC metallic phase. At overdoping LFS disappears and a single ESR line is enormously broadened to Δ Hpp(300K) = 80G. In KxC70 doped under the same conditions the LFS is not detected, indicating absence of SC above 5K, while a narrow ESR single line appears.

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