a r X i v :c o n d -m a t /0112065v 1 [c o n d -m a t .s u p r -c o n ] 5 D e c 2001The magnetic field dependence of the electronic specific heat of Y 0.8Ca 0.2Ba 2Cu 3O 6+x J.L.Luo 1,J.W.Loram 2,T.Xiang 3,J.R.Cooper 2,and J.L.Tallon 41Institute of Physics and Center for Condensed Matter Physics,Chinese Academy of Sciences,P.O.Box 2711,Beijing100080,The People’s Republic of China2IRC in Superconductivity,University of Cambridge,Madingley Road,Cambridge CB30HE,United Kingdom 3Institute of Theoretical Physics,Chinese Academy of Sciences,P.O.Box 2735,Beijing 100080,The People’s Republic ofChina4NewZealand IRL,P.O.box 31310,Lower Hutt,New Zealand(February 1,2008)We have measured the electronic specific heat of Y 0.8Ca 0.2Ba 2Cu 3O 7−δusing a high-resolutiondifferential technique from liquid helium temperature to room temperature in an applied magneticfield up to 13T.The field dependence of the electronic specific heat at low temperatures in thesuperconducting state behaves differently in the overdoped and underdoped regimes,varing as √H ,[1,3,5]consistent with the d-wave pair-ing scenario of high-T c superconductivity.Revaz et.al [5]also showed that the field dependent term obeys a scal-ing function of T/√
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