Pulsed magnetic fields to 53 tesla reveal a new high field phase transition in tau-[P-(S,S)-DMEDT-TTF]_2(AuBr_2)(AuBr_2)_y (where y approx 75). This transition appears as an abrupt increase in the magnetoresistance at a threshold field (B_(Th) approx 44 tesla for T =0.55 K). B_(Th) shifts toward higher magnetic fields with increasing temperature, and there is evidence of higher field sub-phases. Measurements of Shubnikov de Hass oscillations below 33 tesla have provided compelling evidence as to the two-dimensional (2D), metallic nature of this compound. In the following report we discuss this new unexpected state, reminiscent of the field-induced spin density wave (FISDW) behavior in the quasi one-dimensional (Q1D) Bechgaard salts.
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机译：脉冲磁场至53特斯拉在tau-[p-（s，s）-dmedt-ttf] _2（aubr_2）（aubr_2）_y（其中y大约75）中发现了一种新的高场相转变。该转变在阈值场（B_（Th）的磁阻率突然增加（b_（th），对于t = 0.55k）。 B_（th）随着温度的增加而转向更高的磁场，并且存在更高的场阶段的证据。 Shubnikov De Hass振荡低于33特斯拉的测量提供了令人信服的证据，即该化合物的二维（2D），金属性质。在下文报告中，我们讨论了这种新的意想不到的状态，让人想起了准一维（Q1D）Bechgaard盐中的现场诱导的自旋密度波（FISDW）行为。
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