Hierarchical stripe phases inIrTe2driven by competition between Ir dimerization and Te bonding
| Autor: | Kristjan Haule, Weida Wu, S-W. Cheong, Jixia Dai, Yoon Seok Oh, Junjie Yang |
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| Rok vydání: | 2014 |
| Předmět: |
Superconductivity
Physics Condensed matter physics Condensed Matter Physics Electronic Optical and Magnetic Materials law.invention Transition metal law Condensed Matter::Superconductivity Phase (matter) Condensed Matter::Strongly Correlated Electrons Strongly correlated material Scanning tunneling microscope Ground state Spectroscopy Phase diagram |
| Zdroj: | Physical Review B. 90 |
| ISSN: | 1550-235X 1098-0121 |
| Popis: | Layered $5d$ transition metal dichalcogenide (TMD) $\mathrm{IrT}{\mathrm{e}}_{2}$ is distinguished from the traditional TMDs (such as $\mathrm{NbS}{\mathrm{e}}_{2})$ by the existence of multiple charge-density wave (CDW)-like stripe phases and superconductivity at low temperatures. Despite intensive studies, there is still no consensus on the physical origin of the stripe phases or even the ground state modulation for this $5d$ material. Here we present atomic-scale evidence from scanning tunneling microscopy and spectroscopy (STM/STS) that the ground state of $\mathrm{IrT}{\mathrm{e}}_{2}$ is a $q=1/6$ stripe phase, identical to that of the Se-doped compound. Furthermore, our data suggest that the multiple transitions and stripe phases are driven by the intralayer Ir-Ir dimerization that competes against the interlayer Te-Te bonding. The competition results in a unified phase diagram with a series of hierarchical modulated stripe phases, strikingly similar to the renowned ``devil's staircase'' phenomena. |
| Databáze: | OpenAIRE |
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