Features of a Low-Temperature Charge Density Wave in the Monoclinic Phase of NbS3 Manifested in the NMR and in Transport Properties

• Published in: JETP letters 2024-03, Vol.119 (6), p.444-450
• Main Authors: Semakin, A. S., Mukhamedshin, I. R., Zybtsev, S. G., Pokrovskii, V. Ya
• Format: Article
• Language: English
• Subjects: Atomic; Biological and Medical Physics; Biophysics; Charge density waves; Condensed Matter; Distortion; Lattice vibration; Low temperature; Magnetic properties; Molecular; Monoclinic lattice; NMR; Nuclear magnetic resonance; Optical and Plasma Physics; Particle and Nuclear Physics; Phase transitions; Physics; Physics and Astronomy; Quantum Information Technology; Solid State Physics; Spintronics; Transport properties; Vibration mode
• ISSN: 0021-3640; 1090-6487
• DOI: 10.1134/S0021364024600435

The relaxation of the transverse nuclear magnetization in the monoclinic phase of NbS 3 has been studied by the 93 Nb nuclear magnetic resonance method near the temperature T P2 = 150 K, at which a low-temperature charge density wave is formed. It has been shown that the critical slowing down of one of the vibrational modes of the lattice, which is quite slow even above T P2 , occurs slightly below T P2 . The transition at T P2 occurs not only in low-resistance samples, as thought previously, but also in high-resistance ones, and involves Nb atoms in the bulk of a sample. The transport properties of high-resistance samples, namely, the smearing of the depinning threshold for the charge density wave below T P2 , confirm that the phase transition in them occurs at T P2 . It has been concluded that the distortion of the lattice at T P2 is not due to the Peierls mechanism and can be attributed to the Keldysh–Kopaev transition. Another possible mechanism is the fluctuation distortion of the lattice above T P2 that prevents the sliding of the charge density wave.