"Pressure dependence of the charge-density-wave and superconducting states in GdTe3, TbTe3, and DyTe3 "

D. A. Zocco: J. J. Hamlin, K. Grube, J.-H. Chu, H.-H. Kuo, I. R. Fisher, and M. B. Maple; Phys. Rev. B 91, 05/14/15.

Additional Authors: J. J. Hamlin, K. Grube, J.-H. Chu, H.-H. Kuo, I. R. Fisher, and M. B. Maple

Abstract:

We present electrical resistivity and ac-susceptibility measurements of GdTe3, TbTe3 , and DyTe3   performed under pressure. An upper charge-density-wave (CDW) is suppressed at a rate of dTCDW,1 /dP∼−85K/GPa . For TbTe3 and DyTe3, a second CDW below TCDW,2 increases with pressure until it reaches the TCDW,1 (P )line. For GdTe3, the lower CDW emerges as pressure is increased above ∼1GPa . As these two CDW states are suppressed with pressure, superconductivity (SC) appears in the three compounds at lower temperatures. Ac-susceptibility experiments performed on TbTe3 provide compelling evidence for bulk SC in the low-pressure region of the phase diagram. We provide measurements of superconducting critical fields and discuss the origin of a high-pressure superconducting phase occurring above 5 GPa.