Gapless excitations in the ground state of 1T-TaS2

A. Ribak, I. Silber, C. Baines, K. Chashka, Z. Salman, Y. Dagan, A. Kanigel

Research output: Contribution to journalArticle

15 Citations (Scopus)

Abstract

1T-TaS2 is a layered transition-metal dichalcogenide with a very rich phase diagram. At T=180 K it undergoes a metal to Mott insulator transition. Mott insulators usually display antiferromagnetic ordering in the insulating phase but 1T-TaS2 was never shown to order magnetically. In this paper we show that 1T-TaS2 has a large paramagnetic contribution to the magnetic susceptibility but it does not show any sign of magnetic ordering or freezing down to 20 mK, as probed by muon spin relaxation, possibly indicating a quantum spin liquid ground state. Although 1T-TaS2 exhibits a strong resistive behavior both in and out of plane at low temperatures we find a linear term in the heat capacity suggesting the existence of a Fermi surface, which has an anomalously strong magnetic field dependence.

Original languageEnglish (US)
Article number195131
JournalPhysical Review B
Volume96
Issue number19
DOIs
StatePublished - Nov 15 2017

Fingerprint

Fermi surface
Magnetic susceptibility
Freezing
Ground state
Specific heat
Phase diagrams
Transition metals
Magnetization
Metals
insulators
Magnetic fields
ground state
Liquids
freezing
excitation
Fermi surfaces
muons
transition metals
phase diagrams
specific heat

All Science Journal Classification (ASJC) codes

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics

Cite this

Ribak, A., Silber, I., Baines, C., Chashka, K., Salman, Z., Dagan, Y., & Kanigel, A. (2017). Gapless excitations in the ground state of 1T-TaS2. Physical Review B, 96(19), [195131]. https://doi.org/10.1103/PhysRevB.96.195131
Ribak, A. ; Silber, I. ; Baines, C. ; Chashka, K. ; Salman, Z. ; Dagan, Y. ; Kanigel, A. / Gapless excitations in the ground state of 1T-TaS2. In: Physical Review B. 2017 ; Vol. 96, No. 19.
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Ribak, A, Silber, I, Baines, C, Chashka, K, Salman, Z, Dagan, Y & Kanigel, A 2017, 'Gapless excitations in the ground state of 1T-TaS2', Physical Review B, vol. 96, no. 19, 195131. https://doi.org/10.1103/PhysRevB.96.195131

Gapless excitations in the ground state of 1T-TaS2. / Ribak, A.; Silber, I.; Baines, C.; Chashka, K.; Salman, Z.; Dagan, Y.; Kanigel, A.

In: Physical Review B, Vol. 96, No. 19, 195131, 15.11.2017.

Research output: Contribution to journalArticle

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AU - Ribak, A.

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AU - Baines, C.

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AU - Kanigel, A.

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AB - 1T-TaS2 is a layered transition-metal dichalcogenide with a very rich phase diagram. At T=180 K it undergoes a metal to Mott insulator transition. Mott insulators usually display antiferromagnetic ordering in the insulating phase but 1T-TaS2 was never shown to order magnetically. In this paper we show that 1T-TaS2 has a large paramagnetic contribution to the magnetic susceptibility but it does not show any sign of magnetic ordering or freezing down to 20 mK, as probed by muon spin relaxation, possibly indicating a quantum spin liquid ground state. Although 1T-TaS2 exhibits a strong resistive behavior both in and out of plane at low temperatures we find a linear term in the heat capacity suggesting the existence of a Fermi surface, which has an anomalously strong magnetic field dependence.

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Ribak A, Silber I, Baines C, Chashka K, Salman Z, Dagan Y et al. Gapless excitations in the ground state of 1T-TaS2. Physical Review B. 2017 Nov 15;96(19). 195131. https://doi.org/10.1103/PhysRevB.96.195131