Synthesis of monoclinic IrTe2 under high pressure and its physical properties

Li, X.; Yan, J. -Q.; Singh, D. J.; Goodenough, J. B.; Zhou, J. -S.

doi:10.1103/PhysRevB.92.155118

Synthesis of monoclinic IrTe₂ under high pressure and its physical properties

Journal Article · Mon Oct 12 00:00:00 UTC 2015 · Physical Review. B, Condensed Matter and Materials Physics

DOI:https://doi.org/10.1103/PhysRevB.92.155118· OSTI ID:1265846

Li, X. ^[1]; Yan, J. -Q. ^[2]; Singh, D. J. ^[3]; Goodenough, J. B. ^[1]; Zhou, J. -S. ^[1]

Univ. of Texas, Austin, TX (United States)
Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
Univ. of Missouri, Columbia, MO (United States)

In a pressure-temperature (P-T) diagram for synthesizing IrTe₂ compounds, the well-studied trigonal (H) phase with the CdI₂-type structure is stable at low pressures. The superconducting cubic (C) phase can be synthesized under higher temperatures and pressures. A rhombohedral phase with the crystal structure similar to the C phase can be made at ambient pressure; but the phase contains a high concentration of Ir deficiency. Here, we report that a rarely studied monoclinic (M) phase can be stabilized in narrow ranges of pressure and temperature in this P-T diagram. Moreover, the peculiar crystal structure of the M-IrTe₂ eliminates the tendency to form Ir-Ir dimers found in the H phase. The M phase has been fully characterized by structural determination and measurements of electrical resistivity, thermoelectric power, DC magnetization, and specific heat. These physical properties have been compared with those in the H and C phases of Ir_1-xTe₂. Finally, we present magnetic and transport properties and specific heat of the M-IrTe₂ can be fully justified by calculations with the density-functional theory.

View Accepted Manuscript (DOE)

Research Organization:: Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States)

Sponsoring Organization:: National Science Foundation (NSF); USDOE Office of Science (SC), Basic Energy Sciences (BES); USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22)

Grant/Contract Number:: AC05-00OR22725

OSTI ID:: 1265846

Alternate ID(s):: OSTI ID: 1224648

Journal Information:: Physical Review. B, Condensed Matter and Materials Physics, Journal Name: Physical Review. B, Condensed Matter and Materials Physics Journal Issue: 15 Vol. 92; ISSN 1098-0121; ISSN PRBMDO

Publisher:: American Physical Society (APS)Copyright Statement

Country of Publication:: United States

Language:: English

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Spin freezing into a disordered state in CaFeT i 2 O 6 synthesized under high pressure Li, X.; Xu, W. M.; McGuire, M. A. Physical Review B, Vol. 98, Issue 6 https://doi.org/10.1103/physrevb.98.064201	journal	August 2018

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