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TT: Fachverband Tiefe Temperaturen

TT 22: Correlated Electrons: Low-dimensional Systems - Materials 1

TT 22.9: Vortrag

Mittwoch, 28. März 2012, 11:45–12:00, H 0104

Pressure-induced superconducting phase in rare-earth tritellurides (RTe₃, R = Gd, Tb, Dy) — •Diego A. Zocco¹, James J. Hamlin¹, M. Brian Maple¹, Jiun-Haw Chu², and Ian R. Fisher² — ¹Department of Physics, University of California, San Diego — ²Department of Applied Physics, Geballe Laboratory for Advanced Materials, Stanford University

It has recently been reported that the low-dimensional rare-earth tritellurides RTe₃ (R = La-Nd, Sm, Gd-Tm) enter an unidirectional, incommensurate charge-density-wave (CDW) state when cooled below a temperature T_CDW1 ∼ 450 - 250 K, which decreases with increasing rare earth atomic number, due to the effect of chemical pressure. For the heavier R (i. e., Dy-Tm), a second CDW appears at T_CDW2 < T_CDW1, orthogonal to the first one. We have recently found that the application of external pressure induces a superconducting (SC) state in GdTe₃, TbTe₃ and DyTe₃ at low temperatures, coexisting or competing with the two CDWs and the local moment rare-earth magnetism. In this talk, we present the results of experiments we have performed on these materials at high pressure and low temperature, to help develop an understanding of the origin of the superconducting state.