Abstract
The influence of external pressure on the charge-density-wave (CDW) ground state of the quasi-one-dimensional two-leg ladder compound has been studied by optical reflectivity measurements as a function of temperature (10–300 K) and pressure (0.3–4.3 GPa) over the spectral range 580–6000 cm. With increasing pressure the CDW transition temperature decreases with the linear pressure coefficient 70 K/GPa, and above 3 GPa the CDW phase is suppressed at all temperatures. This behavior is similar to that in compounds with increasing Ca content at ambient pressure, with the simple scaling . The size of the CDW gap decreases with increasing pressure, whereas the dimensionality of the high-temperature insulating phase in within the ladder plane is hardly affected by external pressure.
- Received 9 January 2014
- Revised 11 March 2014
DOI:https://doi.org/10.1103/PhysRevB.89.134510
©2014 American Physical Society