Anomalous metal-insulator transition in BaCo1-xNixS2-y as a triggered phase transition

Authors
Poddar, A Kang, H Barner, K Mandal, P Gmelin, E Annaorazov, M Medvedeva, IV
Citation
A. Poddar et al., Anomalous metal-insulator transition in BaCo1-xNixS2-y as a triggered phase transition, PHYS ST S-B, 225(2), 2001, pp. 443-448
Citations number
16
Categorie Soggetti
Apllied Physucs/Condensed Matter/Materiales Science
Journal title
PHYSICA STATUS SOLIDI B-BASIC RESEARCH
ISSN journal
03701972 → ACNP
Volume
225
Issue
2
Year of publication
2001
Pages
443 - 448
Database
ISI
SICI code
0370-1972(200106)225:2<443:AMTIBA>2.0.ZU;2-E
Abstract
The anomalous metal-insulator transition in BaCo1-xNixS2-y is identified as a triggered phase transition based on strong coupling between a magnetic a nd a structural order parameter. In particular, we observe a second-order p aramagnetic-antiferromagnetic transition at TN followed by a first-order me tal-insulator transition at T-MI. The field-induced shifts of the sequentia l transition temperatures are determined for y = 0.05: dT(N)/dB = (-0.8 +/- 0.2) K/T, and (-0.1 +/- 0.1) K/T less than or equal to dT(MI)/dB less than or equal to (-0.5 +/- 0.1) K/T.