Field-dependent specific heat of the canonical underdoped cuprate superconductor YBa${}_2$Cu${}_4$O${}_8$

Jeffery L. Tallon, John W. Loram

The cuprate superconductor YBa${}_2$Cu${}_4$O${}_8$, in comparison with most other cuprates, has a stable stoichiometry, is largely free of defects and may be regarded as the canonical u…