The authors regret that the degrees of cooling were printed incorrectly. The printed values for Cu80Co20 and Cu58Co42 are 104 K and 92 K smaller than the correct values, respectively. Thus, the degrees of cooling range 209–232 K in Cu80Co20, and 242–282 K in Cu58Co42. This error does not change the findings and conclusions in the article. The authors would like to apologise for any inconvenience caused.
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