Measurement and understanding of the temperature dependence of the lower critical field in YNi2B2C

✍ Scribed by T.V Chandrasekhar Rao; P.K Mishra; G Ravikumar; V.C Sahni; K Ghosh; Gautam I Menon; S Ramakrishnan; A.K Grover; Girish Chandra

• Publisher: Elsevier Science
• Year: 1996
• Tongue: English
• Weight: 287 KB
• Volume: 223-224
• Category: Article
• ISSN: 0921-4526
• DOI: 10.1016/0921-4526(96)00046-4

✦ Synopsis

The lower critical field (Her(T)) values in YNi2B2C (To = 15.45 K) are found to fit the quadratic form Hcl(T) = 220 [1 -(T/To) 2] Oe from 5 to 14 K. These values are consistent with an analysis which uses a thermodynarnical critical field He(0) of 1.7 kOe (deduced from experiments). However, measured values of H~I(T) above 14.4 K deviate from the quadratic relation. Taking cue from the presence of intergranularity effects above 14.4 K in our YNi2BzC sample, the He1 data are quantitatively described in terms of a two-component magnetic response.