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An unusual metallic behavior in a Ag4SSe single crystal

Title data

Matteppanavar, Shidaling ; Bui, Nguyen Hai An ; van Smaalen, Sander ; Thamizhavel, Arumugam ; Ramakrishnan, Srinivasan:
An unusual metallic behavior in a Ag4SSe single crystal.
American Institute of Physics
In: AIP Conference Proceedings. Vol. 1942 (2018) Issue 1 . - p. 130001. - 5 S..
DOI: https://doi.org/10.1063/1.5029071

Official URL: Volltext

Project information

Project financing: Alexander von Humboldt-Stiftung

Abstract in another language

We report the magnetic susceptibility, resistivity and heat capacity measurements on high quality single crystalline tetra silver sulphoselenide (Ag4SSe). The magnetic susceptibility and resistivity measurements show anomalies around 260 K. The large diamagnetic drop with hysteresis at the transition implies a first order transition. Such a diamagnetic drop cannot be ascribed to the formation of charge density wave (CDW) since the temperature dependence of the resistivity shows no upturn at this transition. Infact the resistivity is decreasing with decreasing temperature, indicating a metallic behavior. However, unlike normal metals, the resistivity is almost temperature independent in the temperature range from 4-180 K. Usually, when one observes a diamagnetic transition, it is assumed to be due to a drop in the density of states at the Fermi level which leads to the decrease in the Pauli paramagnetic susceptibility. Such a decrease in the density of states often results in an increase in resistivity unless mobility of the charge carriers changes significantly. Hence, we believe that in Ag4SSe, the structural transition causes an unusual Fermi surface reconstruction which in turn leads to a strange metallic behavior at low temperatures.

Further data

Item Type: Article in a journal
Refereed: Yes
Institutions of the University: Faculties > Faculty of Mathematics, Physics und Computer Science > Group Material Sciences > Chair Crystallography
Faculties > Faculty of Mathematics, Physics und Computer Science > Group Material Sciences > Chair Crystallography > Chair Crystallography - Univ.-Prof. Dr. Sander van Smaalen
Faculties
Faculties > Faculty of Mathematics, Physics und Computer Science
Faculties > Faculty of Mathematics, Physics und Computer Science > Group Material Sciences
Result of work at the UBT: Yes
DDC Subjects: 500 Science > 530 Physics
Date Deposited: 13 Apr 2018 08:15
Last Modified: 30 Oct 2019 09:26
URI: https://eref.uni-bayreuth.de/id/eprint/43460