Charge transfer and multiple density waves in the rare earth tellurides

Abstract

Abstract:We use high-resolution synchrotron x-ray diffraction to uncover a second, lowtemperature, charge density wave (CDW) in TbTe 3 . Its T c2 = 41.0 ± 0.4 K is the lowest discovered so far in the rare earth telluride series. The CDW wave vectors of the high temperature and low temperature states differ significantly and evolve in opposite directions with temperature, indicating that the two nested Fermi surfaces are separated and the CDWs coexist independently. Both the in-plane and out-of-plane correlation lengths are robust, implying that the density waves on different Te layers are well coupled through the TbTe layers. Finally, we rule out any low-temperature CDW in GdTe 3 for temperatures above 8 K, an energy scale sufficiently low to make pressure tuning of incipient CDW order a realistic possibility.

Anisotropy of conductivity in rare-earth tritellurides in the static and sliding states of the CDW

“…Note that this temperature coincides well with T CDW2 in this compound as reported in Ref. [11]. 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 Because the studied bridges have a different length and width all the curves are normalized by the resistance at T ¼340 K. As can be seen, these dependencies are in a good agreement with curves sh...…”

“…In TbTe 3 the CDW ordering is observed well above room temperature (T CDW1 ¼ 336 K). The second CDW transition in this compound was recently reported = T 41 K CDW 2 [11], the lowest in the RTe 3 series.…”

Light-induced charge density wave in LaTe3

“…Upon close scrutiny of the transient CDW wavevector, q a , it appears that this CDW is a genuinely nonequilibrium phase (we use a tilde to denote the nonequilibrium value). Notably, the wavevector does not resemble values seen in other rare-earth tritellurides that exhibit an equilibrium a-axis CDW [19][20][21]. The transient CDW has an incommensurate wavevector, q a = 0.291 (13), expressed in reciprocal lattice units (see red square in Fig.…”

Revealing multiple charge-density-wave orders inTbTe3by optical conductivity and ultrafast pump-probe experiments

“…13 Recently, a report 14 on TbTe 3 using high resolution XRD claimed that the compound experiences a second CDW transition at 41.0±0.4 K with a nesting wave vector along a * -axis, following the evolution trend of the other heavier RTe 3 s, and the two CDW orders coexist with each other independently. In order to shed light on the underlying mechanism of coexist and competition between different CDW instabilities, it is essential to investigate the CDW transitions and evolution in TbTe 3 more scrupulously.…”