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Title: Double-stage nematic bond ordering above double stripe magnetism: Application to BaTi 2 Sb 2 O

Journal Article · · Physical Review B
 [1];  [2];  [1];  [2];  [3]
  1. Ames Lab. and Iowa State Univ., Ames, IA (United States). Dept. of Physics and Astronomy. Division of Materials Science and Engineering
  2. Naval Research Lab. (NRL), Washington, DC (United States)
  3. Univ. of Minnesota, Minneapolis, MN (United States). School of Physics and Astronomy

Spin-driven nematicity, or the breaking of the point-group symmetry of the lattice without long-range magnetic order, is clearly quite important in iron-based superconductors. From a symmetry point of view, nematic order can be described as a coherent locking of spin fluctuations in two interpenetrating Néel sublattices with ensuing nearest-neighbor bond order and an absence of static magnetism. In this paper, we argue that the low-temperature state of the recently discovered superconductor BaTi 2 Sb 2 O is a strong candidate for a more exotic form of spin-driven nematic order, in which fluctuations occurring in four Néel sublattices promote both nearest- and next-nearest-neighbor bond order. We develop a low-energy field theory of this state and show that it can have, as a function of temperature, up to two separate bond-order phase transitions, namely, one that breaks rotation symmetry and one that breaks reflection and translation symmetries of the lattice. The resulting state has an orthorhombic lattice distortion, an intra-unit-cell charge density wave, and no long-range magnetic order, all consistent with reported measurements of the low-temperature phase of BaTi 2 Sb 2 O . Finally, we then use density functional theory calculations to extract exchange parameters to confirm that the model is applicable to BaTi 2 Sb 2 O .

Research Organization:
Univ. of Minnesota, Minneapolis, MN (United States); Ames Lab. and Iowa State Univ., Ames, IA (United States); Naval Research Lab. (NRL), Washington, DC (United States)
Sponsoring Organization:
USDOE Office of Science (SC), Basic Energy Sciences (BES); Office of Naval Research (ONR) (United States); National Science Foundation (NSF)
Grant/Contract Number:
SC0012336; AC02-07CH11358; PHYS-1066293
OSTI ID:
1362273
Alternate ID(s):
OSTI ID: 1354753
Journal Information:
Physical Review B, Vol. 95, Issue 17; ISSN 2469-9950
Publisher:
American Physical Society (APS)Copyright Statement
Country of Publication:
United States
Language:
English
Citation Metrics:
Cited by: 23 works
Citation information provided by
Web of Science

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Cited By (3)

Novel electronic nematicity in heavily hole-doped iron pnictide superconductors journal March 2020
Competing magnetic interactions in a spin- 1 2 square lattice: Hidden order in Sr 2 VO 4 journal November 2017
Possible Bicollinear Nematic State with Monoclinic Lattice Distortions in Iron Telluride Compounds text January 2017

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