Quasi-Two-Dimensional Heterostructures (K M1 - XTe)(LaTe3) (M = Mn and Zn) with Charge Density Waves

Jin Ke Bao, Christos D. Malliakas, Chi Zhang, Songting Cai, Haijie Chen, Alexander J.E. Rettie, Brandon L. Fisher, Duck Young Chung, Vinayak P. Dravid, Mercouri G. Kanatzidis*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

Abstract

Layered heterostructure materials with two different functional building blocks can teach us about emergent physical properties and phenomena arising from interactions between the layers. We report intergrowth compounds KLaM1 - xTe4 (M = Mn and Zn; x ≈ 0.35) featuring two chemically distinct alternating layers [LaTe3] and [KM1 - xTe]. Their crystal structures are incommensurate, determined by single X-ray diffraction for the Mn compound and a transmission electron microscope study for the Zn compound. KLaMn1 - xTe4 crystallizes in the orthorhombic superspace group Pmnm(01/2γ)s00 with lattice parameters a = 4.4815(3) Å, b = 21.6649(16) Å, and c = 4.5220(3) Å. It exhibits charge density wave order at room temperature with a modulation wave vector q = 1/2b∗ + 0.3478c∗ originating from electronic instability of Te-square nets in [LaTe3] layers. The Mn analog exhibits a cluster spin glass behavior with spin freezing temperature Tf ≈ 5 K attributed to disordered Mn vacancies and competing magnetic interactions in the [Mn1 - xTe] layers. The Zn analog also has charge density wave order at room temperature with a similar q-vector having the c∗ component ∼0.346 confirmed by selected-area electron diffraction. Electron transfer from [KM1 - xTe] to [LaTe3] layers exists in KLaM1 - xTe4, leading to an enhanced electronic specific heat coefficient. The resistivities of KLaM1 - xTe4 (M = Mn and Zn) exhibit metallic behavior at high temperatures and an upturn at low temperatures, suggesting partial localization of carriers in the [LaTe3] layers with some degree of disorder associated with the M atom vacancies in the [M1 - xTe] layers.

Original languageEnglish (US)
Pages (from-to)2155-2164
Number of pages10
JournalChemistry of Materials
Volume33
Issue number6
DOIs
StatePublished - Mar 23 2021

ASJC Scopus subject areas

  • Chemistry(all)
  • Chemical Engineering(all)
  • Materials Chemistry

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