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Coupled commensurate charge density wave and lattice distortion in Na2Ti2Pn2O (Pn = As,Sb) determined by x-ray diffraction and angle-resolved photoemission spectroscopy

Abstract:

We report single-crystal x-ray-diffraction measurements on Na2Ti2Pn2O (Pn = As,Sb) which reveal a charge superstructure that appears below the density wave transitions previously observed in bulk data. From symmetry-constrained structure refinements we establish that the associated distortion mode can be described by two propagation vectors q1 = (1/2,0,l) and q2 = (0,1/2,l) with l = 0 (Sb) or l = 1/2 (As) and primarily involves in-plane displacements of the Ti atoms perpendicular to the Ti-O ...

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Publication status:
Published
Peer review status:
Peer reviewed
Version:
Accepted manuscript

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Publisher copy:
10.1103/PhysRevB.94.104515

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Department:
Oxford, MPLS, Physics
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Department:
Oxford, MPLS, Physics
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Department:
Oxford, MPLS, Physics
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Department:
Oxford, MPLS, Physics
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Grant:
11274367, 11474330, 11474340, 11234014
Publisher:
American Physical Society Publisher's website
Journal:
Physical Review B Journal website
Volume:
94
Publication date:
2016-09-19
Acceptance date:
2016-08-30
DOI:
ISSN:
2469-9969 and 2469-9950
Pubs id:
pubs:654853
URN:
uri:1a1e08b9-07b8-48de-86f8-f402714258e2
UUID:
uuid:1a1e08b9-07b8-48de-86f8-f402714258e2
Local pid:
pubs:654853
Language:
English

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