Antiferromagnetism in YBa2Cu3O6+x: Ga and Zn substitutions I. 89Y NMR determination of the Néel temperature

Alloul, H.; Ohno, Takashi; Casalta, H.; Marucco, J.F.; Mendels, P.; Arabski, J.; Collin, G.; Mehbod, Mohammad

doi:10.1016/0921-4534(90)90251-9

Cited by 54 publications

(11 citation statements)

References 30 publications

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“…Below T N ϭ420 K, the Néel temperature 16 of pure YBa 2 Cu 3 O 6ϩx , Cu 2ϩ ions form a simple square lattice AF order. Magnetic moments are oriented 4 in the ͑a,b͒ plane but the full magnetic structure, and in particular the easy magnetization direction, has not been determined by neutron diffraction.…”

Section: A Magnetic Structure Of Yba 2 Cu 3 O 6؉xmentioning

confidence: 99%

Antiferromagnetic domains inYBa2Cu3O6+
Jànossy
¹
,
Simón
²
,
Fehér
³

et al. 1999
Phys. Rev. B
43
2
33
1
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The anisotropy of the static homogeneous magnetic spin susceptibility of the antiferromagnetic CuO 2 bilayers and the crystal-field parameters are measured in Gd-doped YBa 2 Cu 3 O 6ϩx ͑small x͒ single crystals using Gd 3ϩ ESR at 9, 75, 150, and 225 GHz. We show that the easy magnetization direction is along ͓100͔ and that there is a magnetostriction leading to an orthorhombic lattice distortion. We observe an antiferromagnetic domain structure corresponding to the two equivalent orthorhombic distortions of the tetragonal lattice which depends on magnetic fields of the order of 1 T. The domain structure is unchanged between 10 and 150 K and is independent of thermal and magnetic history. We discuss two models: ͑i͒ charged domain walls, ͑ii͒ magnetization pinned to a small number of defective oxygen-rich Cu͑1͒ layers.

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Section: A Magnetic Structure Of Yba 2 Cu 3 O 6؉xmentioning

confidence: 99%

Antiferromagnetic domains inYBa2Cu3O6+
Jànossy
¹
,
Simón
²
,
Fehér
³

et al. 1999
Phys. Rev. B
43
2
33
1
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“…This circumstance was recognized earlier for the Ca-free YBa 2 Cu 3 O 7Ϫ␦ where the Néel temperature is almost unaffected for 0.8Ͻ␦Ͻ1, even though T N is known to be rapidly suppressed already by a very small amount of charge carriers within the CuO 2 planes. 28 This effect was quantified using bond valence sums determined from neutron diffraction data 8 We have further investigated these samples by measuring the thermoelectric power ͑TEP͒ S(T) as a function of temperature ͑TϽ300 K͒ using conventional methods. 7 16 We would like to point out that the negative shift of the TEP with increasing Ca content cannot be explained in terms of an increase of the negative ''chain contribution.''…”

Section: Shown Inmentioning

confidence: 99%

Thermoelectric power ofY1−xCa
Bernhard
¹
,
Tallon
²

1996
Phys. Rev. B
87
6
55
0
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The thermoelectric power ͑TEP͒ has been studied for polycrystalline ͑Y,Yb͒ 1Ϫx Ca x Ba 2 Cu 3 O 7Ϫ␦ with variable Ca and O content. The partial substitution of Y 3ϩ by Ca 2ϩ introduces additional hole carriers into the CuO 2 planes and allows the 123 system access far into the overdoped regime. Consequently, the CuO chains can be strongly deoxygenated until they are nonmetallic ͑and no more contribute to the TEP͒, while the CuO 2 planes still are optimally doped (T c ϭT c,max ) or even slightly overdoped. Over a fairly wide range of doping this enables us to study the TEP of the 123 system as it arises solely from the CuO 2 planes ͑''plane contribution''͒. This ''plane contribution'' is in good agreement with the general trend reported for various Bi and Tl compounds ͓S. D. Obertelli, J. R. Cooper, and J. L. Tallon, Phys. Rev. B 46, 14 928 ͑1992͔͒. For samples with almost fully oxygenated CuO chains, assuming independent TEP contributions from CuO 2 planes and CuO chains, we deduce a ''chain contribution'' which is very similar to the results obtained on untwinned single crystals ͓J. L. Cohn et al., Phys. Rev.

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“…Therefore J ex can be usually estimated from the broadening of the host NMR [24,45]. Currently, experiments do not permit a clear indication on the applicability of an exchange model.…”

Section: Discussionmentioning

confidence: 99%

“…Samples of YBCO 6+x :Zn were prepared by conventional solid state reaction techniques as described elsewhere [24]. Large (single crystal) grain (size > 50 microns) samples were made which were finely ground before oxygenation (see Ref.…”

Section: Methodsmentioning

confidence: 99%

Non ergodic aging in potassium niobo-tantalate crystals

Doussineau¹,

Lacerda-Arôso²,

Levelut³

et al. 2000

Eur. Phys. J. B

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We present detailed data and analysis of the effects of Zn substitution on the planar Cu site in YBa2Cu3O6+x (YBCO6+x) as evidenced from our 89 Y NMR measurements on oriented powders. For x 1 we find additional NMR lines which are associated with the Zn substitution. From our data on the intensities and temperature dependence of the shift, width, and spin-lattice relaxation rate of these resonances, we conclude that the spinless Zn 3d 10 state induces local moments on the near-neighbour (nn) Cu atoms. Additionally, we conjecture that the local moments actually extend to the farther Cu atoms with the magnetization alternating in sign at subsequent nn sites. We show that this analysis is compatible with ESR data taken on dilute Gd doped (on the Y site) and on neutron scattering data reported recently on Zn substituted YBCO6+x. For optimally doped compounds 89 Y nn resonances are not detected, but a large T -dependent contribution to the 89 Y NMR linewidth is evidenced and is also attributed to the occurence of a weak induced local moment near the Zn. These results are compatible with macroscopic magnetic measurements performed on YBCO6+x samples prepared specifically in order to minimize the content of impurity phases. We find significant differences between the present results on the underdoped YBCO6+x samples and 27 Al NMR data taken on Al 3+ substituted on the Cu site in optimally doped La2CuO4. Further experimental work is needed to clarify the detailed evolution of the impurity induced magnetism with hole content in the cuprates. PACS. 74.72.Bk Y-based cuprates -74.25.Ha Magnetic properties -76.60.Cq Chemical and Knight shifts a Permanent address:

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Antiferromagnetism in YBa2Cu3O6+x: Ga and Zn substitutions I. 89Y NMR determination of the Néel temperature

Cited by 54 publications

References 30 publications

Antiferromagnetic domains inYBa2Cu3O6+
Jànossy
¹
,
Simón
²
,
Fehér
³

et al. 1999
Phys. Rev. B
43
2
33
1
View full text Add to dashboard Cite

Antiferromagnetic domains inYBa2Cu3O6+
Jànossy
¹
,
Simón
²
,
Fehér
³

et al. 1999
Phys. Rev. B
43
2
33
1
View full text Add to dashboard Cite

Thermoelectric power ofY1−xCa
Bernhard
¹
,
Tallon
²

1996
Phys. Rev. B
87
6
55
0
View full text Add to dashboard Cite

Non ergodic aging in potassium niobo-tantalate crystals

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Antiferromagnetism in YBa2Cu3O6+x: Ga and Zn substitutions I. 89Y NMR determination of the Néel temperature

Cited by 54 publications

References 30 publications

Antiferromagnetic domains inYBa2Cu3O6+Jànossy1, Simón2, Fehér3 et al. 1999Phys. Rev. B432331View full textAdd to dashboardCite

Antiferromagnetic domains inYBa2Cu3O6+Jànossy1, Simón2, Fehér3 et al. 1999Phys. Rev. B432331View full textAdd to dashboardCite

Thermoelectric power ofY1−xCaBernhard1, Tallon2 1996Phys. Rev. B876550View full textAdd to dashboardCite

Non ergodic aging in potassium niobo-tantalate crystals

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Product

Resources

About

Antiferromagnetic domains inYBa2Cu3O6+
Jànossy
¹
,
Simón
²
,
Fehér
³

et al. 1999
Phys. Rev. B
43
2
33
1
View full text Add to dashboard Cite

Antiferromagnetic domains inYBa2Cu3O6+
Jànossy
¹
,
Simón
²
,
Fehér
³

et al. 1999
Phys. Rev. B
43
2
33
1
View full text Add to dashboard Cite

Thermoelectric power ofY1−xCa
Bernhard
¹
,
Tallon
²

1996
Phys. Rev. B
87
6
55
0
View full text Add to dashboard Cite