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

doi:10.1016/0921-4534(91)92008-Y

Microwave low-field absorption and ESR in K_x(C₆₀)_1-y(C₇₀)_y and K_xC₇₀

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 K_xC₇₀ is performed. The critical temperature of K_x(C₆₀/C₇₀) determined at the onset of hysteretic LFS, decreases to T_c=16K (at about 10% C₇₀), and T_c=10K (at about 25% C₇₀), compared with T_c=19K in pure K_xC₆₀ 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 K_x(C₆₀/C₇₀) indicating presence of a non-SC metallic phase. At overdoping LFS disappears and a single ESR line is enormously broadened to Δ H_pp(300K) = 80G. In K_xC₇₀ doped under the same conditions the LFS is not detected, indicating absence of SC above 5K, while a narrow ESR single line appears.

Original language	English (US)
Pages (from-to)	411-412
Number of pages	2
Journal	Physica C: Superconductivity and its applications
Volume	185-189
Issue number	PART 1
DOIs	https://doi.org/10.1016/0921-4534(91)92008-Y
State	Published - Dec 1 1991
Externally published	Yes

All Science Journal Classification (ASJC) codes

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

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10.1016/0921-4534(91)92008-Y

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@article{4e0e698674604549ba122b6b0ead10ca,

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

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.",

author = "Zakhidov, {A. A.} and K. Imaeda and A. Ugawa and K. Yakushi and H. Inokuchi and Z. Iqbal and Baughman, {R. H.} and Ramakrishna, {B. I.} and Y. Achiba",

year = "1991",

month = dec,

day = "1",

doi = "10.1016/0921-4534(91)92008-Y",

language = "English (US)",

volume = "185-189",

pages = "411--412",

journal = "Physica C: Superconductivity and its applications",

issn = "0921-4534",

publisher = "Elsevier B.V.",

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TY - JOUR

T1 - Microwave low-field absorption and ESR in Kx(C60)1-y(C70)y and KxC70

AU - Zakhidov, A. A.

AU - Imaeda, K.

AU - Ugawa, A.

AU - Yakushi, K.

AU - Inokuchi, H.

AU - Iqbal, Z.

AU - Baughman, R. H.

AU - Ramakrishna, B. I.

AU - Achiba, Y.

PY - 1991/12/1

Y1 - 1991/12/1

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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U2 - 10.1016/0921-4534(91)92008-Y

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SN - 0921-4534

VL - 185-189

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EP - 412

JO - Physica C: Superconductivity and its applications

JF - Physica C: Superconductivity and its applications

IS - PART 1

ER -

Microwave low-field absorption and ESR in K_x(C₆₀)_1-y(C₇₀)_y and K_xC₇₀

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