Antiferromagnetic ordering and paramagnetic behavior of ferromagnetic Cu6 and Cu18 clusters in BaCuO2+x

Z. R. Wang; X. L. Wang; J. A. Fernandez-Baca; D. C. Johnston; D. Vaknin

Antiferromagnetic ordering and paramagnetic behavior of ferromagnetic Cu₆ and Cu₁₈ clusters in BaCuO_2+x

Z. R. Wang, X. L. Wang, J. A. Fernandez-Baca, D. C. Johnston, D. Vaknin

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Abstract

Magnetization and neutron diffraction measurements on polycrystalline BaCuO_2+x revealed a combination of magnetic behaviors. The Cu₆ ring clusters and Cu₁₈ sphere clusters in this compound had ferromagnetic ground states with large spins 3 and 9, respectively. The Cu₆ rings ordered antiferromagnetically below the Néel temperature T_N = 15 ± 0.5 kelvin, whereas the Cu₁₈ spheres remained paramagnetic down to 2 kelvin. The ordered moment below T_N was 0.89(5) Bohr magnetons per Cu in the Cu₆ rings, demonstrating that quantum fluctuation effects are small in these atomic clusters. The Cu₁₈ clusters are predicted to exhibit ferromagnetic intercluster order below about 1 kelvin.

Original language	English
Pages (from-to)	402-404
Number of pages	3
Journal	Science
Volume	264
Issue number	5157
State	Published - Apr 15 1994

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@article{c9cf54dcbeec47408c6ea7b083903339,

title = "Antiferromagnetic ordering and paramagnetic behavior of ferromagnetic Cu6 and Cu18 clusters in BaCuO2+x",

abstract = "Magnetization and neutron diffraction measurements on polycrystalline BaCuO2+x revealed a combination of magnetic behaviors. The Cu6 ring clusters and Cu18 sphere clusters in this compound had ferromagnetic ground states with large spins 3 and 9, respectively. The Cu6 rings ordered antiferromagnetically below the N{\'e}el temperature TN = 15 ± 0.5 kelvin, whereas the Cu18 spheres remained paramagnetic down to 2 kelvin. The ordered moment below TN was 0.89(5) Bohr magnetons per Cu in the Cu6 rings, demonstrating that quantum fluctuation effects are small in these atomic clusters. The Cu18 clusters are predicted to exhibit ferromagnetic intercluster order below about 1 kelvin.",

author = "Wang, {Z. R.} and Wang, {X. L.} and Fernandez-Baca, {J. A.} and Johnston, {D. C.} and D. Vaknin",

year = "1994",

month = apr,

day = "15",

language = "English",

volume = "264",

pages = "402--404",

journal = "Science",

issn = "0036-8075",

publisher = "American Association for the Advancement of Science",

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TY - JOUR

T1 - Antiferromagnetic ordering and paramagnetic behavior of ferromagnetic Cu6 and Cu18 clusters in BaCuO2+x

AU - Wang, Z. R.

AU - Wang, X. L.

AU - Fernandez-Baca, J. A.

AU - Johnston, D. C.

AU - Vaknin, D.

PY - 1994/4/15

Y1 - 1994/4/15

N2 - Magnetization and neutron diffraction measurements on polycrystalline BaCuO2+x revealed a combination of magnetic behaviors. The Cu6 ring clusters and Cu18 sphere clusters in this compound had ferromagnetic ground states with large spins 3 and 9, respectively. The Cu6 rings ordered antiferromagnetically below the Néel temperature TN = 15 ± 0.5 kelvin, whereas the Cu18 spheres remained paramagnetic down to 2 kelvin. The ordered moment below TN was 0.89(5) Bohr magnetons per Cu in the Cu6 rings, demonstrating that quantum fluctuation effects are small in these atomic clusters. The Cu18 clusters are predicted to exhibit ferromagnetic intercluster order below about 1 kelvin.

AB - Magnetization and neutron diffraction measurements on polycrystalline BaCuO2+x revealed a combination of magnetic behaviors. The Cu6 ring clusters and Cu18 sphere clusters in this compound had ferromagnetic ground states with large spins 3 and 9, respectively. The Cu6 rings ordered antiferromagnetically below the Néel temperature TN = 15 ± 0.5 kelvin, whereas the Cu18 spheres remained paramagnetic down to 2 kelvin. The ordered moment below TN was 0.89(5) Bohr magnetons per Cu in the Cu6 rings, demonstrating that quantum fluctuation effects are small in these atomic clusters. The Cu18 clusters are predicted to exhibit ferromagnetic intercluster order below about 1 kelvin.

UR - http://www.scopus.com/inward/record.url?scp=0028414181&partnerID=8YFLogxK

M3 - Article

AN - SCOPUS:0028414181

SN - 0036-8075

VL - 264

SP - 402

EP - 404

JO - Science

JF - Science

IS - 5157

ER -

Antiferromagnetic ordering and paramagnetic behavior of ferromagnetic Cu₆ and Cu₁₈ clusters in BaCuO_2+x

Abstract

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