Elastic Softening in the Tetrahedrite Cu12Sb4S13

Takashi Suzuki, Hiroki Goto, Isao Ishii, Yoshihito Noguchi, Shuhei Kamikawa, Koichiro Suekuni, Hiromi I. Tanaka, Toshiro Takabatake

Research output: Contribution to journalConference articlepeer-review

2 Citations (Scopus)

Abstract

The tetrahedrite Cu12Sb4S13 has a cubic structure above 100 K and is paid attention as thermoelectric materials. At 85 K, a metal-semiconductor phase transition is reported by the electrical resistivity and magnetic susceptibility measurements. The origin of the phase transition is not determined yet. To investigate the phase transition at 85 K, we measured elastic modulus using an ultrasonic technique on polycrystalline samples. The longitudinal modulus shows elastic softening from above 300 K, suggesting that there is an instability of the structure or the electronic state. The softening continues down to 85 K, and it turns into increase below 85 K accompanied by hysteresis. The phase transition is of the first-order. The elastic hardening indicates disappearance of the instability by the phase transition.

Original languageEnglish
Pages (from-to)443-446
Number of pages4
JournalPhysics Procedia
Volume75
DOIs
Publication statusPublished - 2015
Event20th International Conference on Magnetism, ICM 2015 - Barcelona, Spain
Duration: Jul 5 2015Jul 10 2015

All Science Journal Classification (ASJC) codes

  • Physics and Astronomy(all)

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