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Unusual electronic properties of a low-temperature phase of Ag₄SSe

Title data

Matteppanavar, Shidaling ; Bui, Nguyen Hai An ; Ramakrishnan, Srinivasan ; Vagadia, Megha ; Thamizhavel, Arumugam ; Paul, Arpita ; Waghmare, Umesh V. ; Schönleber, Andreas ; van Smaalen, Sander:
Unusual electronic properties of a low-temperature phase of Ag₄SSe.
In: Physical Review Materials. Vol. 2 (2018) Issue 11 . - Art.Nr. 113606.
ISSN 2475-9953
DOI: https://doi.org/10.1103/PhysRevMaterials.2.113606

Project information

Project financing: Alexander von Humboldt-Stiftung
Deutsche Forschungsgemeinschaft

Abstract in another language

The superionic electrical conductor Ag4SSe is reported to undergo an unusual first-order structural phase transition at ∼260K with concomitant anomalous electronic properties. Single-crystal x-ray diffraction reveals that the crystal undergoes a structural transition from monoclinic α−Ag4SSe to an orthorhombic crystal structure below 260 K. The new low-temperature phase is denoted as δ−Ag4SSe, and it is found to be isostructural to α−Ag2Se. The diamagnetic magnetic susceptibility is of larger magnitude in the low-temperature δ phase than in α−Ag4SSe. A diamagnetic susceptibility of larger magnitude is usually related to a lower density of states at the Fermi level which leads to a decrease in the Pauli paramagnetic susceptibility. However, we find δ−Ag4SSe to be metallic with a much lower resistivity than semiconducting α−Ag4SSe. As a consequence, the α−δ structural phase transition of Ag4SSe causes an unusual Fermi surface reconstruction with an increased mobility of charge carriers and unexpected metallic behavior in δ−Ag4SSe. Band structure calculations substantiate such a claim. In addition, we also observe spontaneous voltage generation (SVG) at the phase transition, which has previously been observed only in a few magnetic materials.

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: 04 Dec 2018 07:20
Last Modified: 04 Dec 2018 07:20
URI: https://eref.uni-bayreuth.de/id/eprint/46515