The Specific Heat of La_1.85Sr_0.15CuO_4: d-Wave Scaling.
Abstract
The specific heat (C) of two polycrystalline samples of La_1.85Sr_0.15CuO4 (LSCO) is reported for 1 <= T <= 45 K and magnetic fields (H) to 9T. Tc for one sample was ~36K and for the other ~39K, with well-resolved anomalies in C at T_c. For both samples the concentrations of paramagnetic centers were unusually low, <=10-4 moles/mole LSCO. This facilitated the identification of a well-defined αT^2 term for H = 0 and 1 <= T <= 10 K, as expected for lines of nodes in the gap. For T/H^1/2 <= 10 K/T^1/2 the αT^2 term was replaced by a βH^1/2T term, as predicted for d-wave superconductivity, with complex crossover behavior for T/H^1/2 >= 10 K/T^1/2. Overall, the electron density of states contribution scales as predicted for d-wave pairing. This behavior is similar to that for YBCO reported elsewhere at this meeting.
- Publication:
-
APS March Meeting Abstracts
- Pub Date:
- March 1998
- Bibcode:
- 1998APS..MARI38119F