Abstract
The specific heat of is measured at low-temperatures to determine the magnitude of the electronic specific-heat coefficient in an attempt to gain an insight into the origin of the unusually large thermoelectric power of this compound. It is found that is as large as which is an order of magnitude larger than of simple metals. This indicates that is a strongly-correlated electron system, where the strong correlation probably comes from the low-dimensionality and the frustrated spin structure. We discuss how the large thermopower and its dependence on Ca doping can be understood with the strong electron correlations.
- Received 24 December 1998
DOI:https://doi.org/10.1103/PhysRevB.60.10580
©1999 American Physical Society