Novel Pr-Cu magnetic phase at low temperature in PrBa2Cu3O6+x observed by neutron diffraction

A.T. Boothroyd; A. Longmore; N.H. Andersen; E. Brecht; T. Wolf

doi:10.1103/PhysRevLett.78.130

Novel Pr-Cu magnetic phase at low temperature in PrBa₂Cu₃O₆₊_x observed by neutron diffraction

A.T. Boothroyd, A. Longmore, N.H. Andersen, E. Brecht, T. Wolf

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Abstract

We have studied by neutron diffraction the magnetic ordering in Al-free crystals of PrBa2Cu3O6+x (x = 0.35 and 0.92) that do not display the AFII Cu magnetic phase. Wt find that the Pr ordering below 20 K is accompanied by a counterrotation of the Cu antiferromagnetism on each plane of the bilayer. The maximum turn angle between the two planes is 60 degrees +/- 9 degrees for the x = 0.92 crystal, and 40 degrees +/- 11 degrees for the x = 0.35 crystal. This is the first observation of a noncollinear ordering of Cu moments in the bilayer, and is evidence for significant magnetic coupling between the Cu and Pr sublattices.

Original language	English
Journal	Physical Review Letters
Volume	78
Issue number	1
Pages (from-to)	130-133
ISSN	0031-9007
DOIs	https://doi.org/10.1103/PhysRevLett.78.130
Publication status	Published - 1997

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title = "Novel Pr-Cu magnetic phase at low temperature in PrBa2Cu3O6+x observed by neutron diffraction",

abstract = "We have studied by neutron diffraction the magnetic ordering in Al-free crystals of PrBa2Cu3O6+x (x = 0.35 and 0.92) that do not display the AFII Cu magnetic phase. Wt find that the Pr ordering below 20 K is accompanied by a counterrotation of the Cu antiferromagnetism on each plane of the bilayer. The maximum turn angle between the two planes is 60 degrees +/- 9 degrees for the x = 0.92 crystal, and 40 degrees +/- 11 degrees for the x = 0.35 crystal. This is the first observation of a noncollinear ordering of Cu moments in the bilayer, and is evidence for significant magnetic coupling between the Cu and Pr sublattices. ",

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author = "A.T. Boothroyd and A. Longmore and N.H. Andersen and E. Brecht and T. Wolf",

year = "1997",

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T1 - Novel Pr-Cu magnetic phase at low temperature in PrBa2Cu3O6+x observed by neutron diffraction

AU - Boothroyd, A.T.

AU - Longmore, A.

AU - Andersen, N.H.

AU - Brecht, E.

AU - Wolf, T.

PY - 1997

Y1 - 1997

N2 - We have studied by neutron diffraction the magnetic ordering in Al-free crystals of PrBa2Cu3O6+x (x = 0.35 and 0.92) that do not display the AFII Cu magnetic phase. Wt find that the Pr ordering below 20 K is accompanied by a counterrotation of the Cu antiferromagnetism on each plane of the bilayer. The maximum turn angle between the two planes is 60 degrees +/- 9 degrees for the x = 0.92 crystal, and 40 degrees +/- 11 degrees for the x = 0.35 crystal. This is the first observation of a noncollinear ordering of Cu moments in the bilayer, and is evidence for significant magnetic coupling between the Cu and Pr sublattices.

AB - We have studied by neutron diffraction the magnetic ordering in Al-free crystals of PrBa2Cu3O6+x (x = 0.35 and 0.92) that do not display the AFII Cu magnetic phase. Wt find that the Pr ordering below 20 K is accompanied by a counterrotation of the Cu antiferromagnetism on each plane of the bilayer. The maximum turn angle between the two planes is 60 degrees +/- 9 degrees for the x = 0.92 crystal, and 40 degrees +/- 11 degrees for the x = 0.35 crystal. This is the first observation of a noncollinear ordering of Cu moments in the bilayer, and is evidence for significant magnetic coupling between the Cu and Pr sublattices.

KW - Nye funktionelle materialer

U2 - 10.1103/PhysRevLett.78.130

DO - 10.1103/PhysRevLett.78.130

M3 - Journal article

VL - 78

SP - 130

EP - 133

JO - Physical Review Letters

JF - Physical Review Letters

SN - 0031-9007

IS - 1