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63Cu(2) NQR study on isotope effect in YBa2Cu4O8

โœ Scribed by Takashi Ohno; Kunisuke Asayama

Publisher
Elsevier Science
Year
1999
Tongue
English
Weight
180 KB
Volume
258
Category
Article
ISSN
0375-9601

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โœฆ Synopsis

63

ลฝ .

A significant scaling of the spin-lattice relaxation rate 1rT by TrT was found between Cu 2 relaxation rates for 1 C 18 O and 16 O exchanged YBa Cu O . 18 O exchange is considered to induce a decrease in the characteristic energy G of 2 4 8 Q

antiferromagnetic spin fluctuations, which produces an increase in 1rT and a decrease in T . q 1999 Elsevier Science B.V.

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The influence of hydrostatic pressure up to 1.1 GPa on critical parameters (To, Hc~, j~) of YBa2Cu4Os (Y 124) and Gd-Ba2Cu4Os (Gd124) ceramics has been investigated using a CuBe pressure bomb. A linear increase of Tc with the growth of pressure was found, with d Tc/dp = 5.5 K/GPa and 4.5 K/GPa for Y