Phonon echoes in powders of high-Tc superconducting YBa2Cu3O7−δ

H. Nishihara; K. Hayashi; Y. Okuda; K. Kajimura

doi:10.1103/PhysRevB.39.7351

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Phonon echoes in powders of high-Tc superconducting YBa2Cu3O7−δ

H. Nishihara, K. Hayashi, Y. Okuda, K. Kajimura

DOI 10.1103/PhysRevB.39.7351 · Physical Review B

T1

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Abstract

Strong rf phonon echoes have been observed in the superconducting state of powders of high-Tc YBa2Cu3O7−δ. We suggest that the coupling mechanism between rf fields and acoustic modes is different from that in the usual phonon echoes judging from the sudden disappearance of the echoes at Tc=90 K and from the angular dependence of the echo intensity. The temperature dependence of T2−1 is tentatively ascribed to the ultrasonic attenuation due to electrons, and the energy gap parameter 2Δ/kBTc is estimated to be 3–7.

Source-reported materials — not catalogue approval

Formula	Reported Tc (K)	Pressure (GPa)	Type
YBa2Cu3O7-δ Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	90	Pressure not reported	onset