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Observation of paramagnetic spin-degeneracy lifting in EuZn2 Sb2

Journal Article · · Physical Review. B
 [1];  [2];  [3];  [1];  [1];  [1];  [1];  [4];  [5];  [5];  [3];  [1]
  1. Univ. of Central Florida, Orlando, FL (United States)
  2. Univ. of Central Florida, Orlando, FL (United States); Idaho National Laboratory (INL), Idaho Falls, ID (United States)
  3. Northeastern Univ., Boston, MA (United States); Northeastern Univ., Burlington, MA (United States). Quantum Materials and Sensing Institute
  4. Tata Institute of Fundamental Research, Mumbai (India)
  5. Polish Academy of Sciences, Wrocław (Poland)
+ Show Author Affiliations

Taken together, time-reversal and spatial inversion symmetries impose a twofold spin degeneracy of the electronic states in crystals. In centrosymmetric materials, this degeneracy can be lifted by introducing magnetism, either via an externally applied field or through internal magnetization. However, a correlated alignment of spins, even in the paramagnetic phase, can lift the spin degeneracy of electronic states. Here, we report an in-depth study of the electronic band structure of the Eu-ternary pnictide EuZn2Sb2 through a combination of high-resolution angle-resolved photoemission spectroscopy measurements and first-principles calculations. An analysis of the photoemission line shapes over a range of incident photon energies and sample temperatures is shown to reveal the presence of band spin-degeneracy lifting in the paramagnetic phase. Our angle-resolved photoemission spectroscopy results are in good agreement with theoretical ferromagnetic-phase calculations, which indicates the importance of ferromagnetic fluctuations in the system. Through our calculations, we predict that spin-polarized bands in EuZn2Sb2 generate a single pair of Weyl nodes. Our observation of band splittingin EuZn2Sb2 provides a key step toward realizing time-reversal symmetry breaking physics in the absence of long-range magnetic order.

Research Organization:
Idaho National Laboratory (INL), Idaho Falls, ID (United States)
Sponsoring Organization:
USDOE Office of Science (SC), Basic Energy Sciences (BES); US Air Force Office of Scientific Research (AFOSR); National Science Foundation (NSF); National Science Centre Poland (NCN)
Grant/Contract Number:
AC07-05ID14517; AC02-76SF00515; AC02-05CH11231
OSTI ID:
2428951
Alternate ID(s):
OSTI ID: 2474175
Report Number(s):
INL/JOU--24-79383-Rev000
Journal Information:
Physical Review. B, Journal Name: Physical Review. B Journal Issue: 4 Vol. 110; ISSN 2469-9950
Publisher:
American Physical Society (APS)Copyright Statement
Country of Publication:
United States
Language:
English

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Related Subjects

75 CONDENSED MATTER PHYSICS
SUPERCONDUCTIVITY AND SUPERFLUIDITY
Angle-resolved photoemission spectroscopy
Density of states
Electronic structure
Fermi surface
First-principles calculations
Spin-orbit coupling
Surface states
Topological materials
Weyl semimetal