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arXiv 1602.08616cond-mat.supr-con
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过渡金属五碲化物HfTe5的压力驱动超导电性

Pressure-driven Superconductivity in Transition-metal Pentatelluride HfTe5

Yanpeng Qi, Wujun Shi, Pavel G. Naumov, Nitesh Kumar, Walter Schnelle, Oleg Barkalov, Chandra Shekhar, Horst Borrmann, Claudia Felser, Binghai Yan, Sergey A. Medvedev

摘要:

层状过渡金属碲化物由于其丰富的物理性质而引起了人们的广泛关注,如二碲化钨WTe2表现出极大的磁阻效应,三碲化锆ZrTe3在低温下表现出电荷密度波跃迁,五碲化锆ZrTe5表现出神秘的电阻率异常和大的热电势。最近,一些过渡金属碲化物被预测为量子自旋霍尔绝缘体(如ZrTe 5和HfTe 5)或Weyl半金属(如WTe 2和MoTe 2),并受到了深入的研究。在这里,我们报告的发现在高压下的五碲化铪HfTe 5的超导性。我们观察到两个结构的相变和金属化与超导发展在5 GPa左右。在20 GPa的压力下,超导体的最大临界温度为4.8 K,并且超导性一直持续到我们研究的最大压力(42 GPa)。理论计算表明,在中压下,超导性主要发生在Te原子层中,而在高压下,超导性主要发生在Te原子链中。

英文摘要:

Layered transition-metal tellurides have attracted considerable attention because of their rich physics; for example, tungsten ditelluride WTe2 exhibits extremely large magnetoresistance; the tritelluride ZrTe3 shows a charge density wave transition at low temperature; and the pentatelluride ZrTe5 displays an enigmatic resistivity anomaly and large thermoelectric power. Recently some transition-metal tellurides are predicted to be quantum spin Hall insulators (e.g. ZrTe5 and HfTe5) or Weyl semimetals (e.g. WTe2 and MoTe2) and were subjected to intensive investigations. Here, we report on the discovery of superconductivity in hafnium pentatelluride HfTe5 under high pressure. We observe two structural phase transitions and metallization with superconductivity developing at around 5 GPa. A maximal critical temperature of 4.8 K is attained at a pressure of 20 GPa, and superconductivity persists up to the maximum pressure in our study (42 GPa). Theoretical calculations indicate that the superconductivity develops mainly in the Te atom layers at medium pressure and in the Te atom chains at high pressure.

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