Singlet ground state determined by isolated Cu2+ chain topology in microporous Na2Cu2Si4O112H2O and Na2Cu2Si4O11

António Moreira Dos Santos; Vitor S. Amaral; Paula Brandão; Filipe A.Almeida Paz; João Rocha; Liliana P. Ferreira; Margarida Godinho; Olga Volkova; Alexander Vasiliev

doi:10.1103/PhysRevB.72.092403

Singlet ground state determined by isolated Cu2+ chain topology in microporous Na2Cu2Si4O112H2O and Na2Cu2Si4O11

António Moreira Dos Santos, Vitor S. Amaral, Paula Brandão, Filipe A.Almeida Paz, João Rocha, Liliana P. Ferreira, Margarida Godinho, Olga Volkova, Alexander Vasiliev

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Abstract

The copper silicate Na2Cu2Si4O112H2O and its dehydrated form Na2Cu2Si4O11 exhibit a singlet ground state at low temperature, which is conditioned by the topology of the isolated edge-sharing CuO6 (or CuO5) chains. The structural analysis of the hydrated and dehydrated forms indicates a strong alternation of the exchange interaction parameter within these chains. The magnetic susceptibility and specific heat measurements confirm spin gaps Δ=96K for Na2Cu2Si4O112H2O and Δ=85K for Na2Cu2Si4O11. The reversible dehydration of the water molecules from the microporous framework in the structure affords unique opportunity for tuning the magnetic interaction parameters in these compounds.

Original language	English
Article number	092403
Journal	Physical Review B - Condensed Matter and Materials Physics
Volume	72
Issue number	9
DOIs	https://doi.org/10.1103/PhysRevB.72.092403
State	Published - Sep 1 2005
Externally published	Yes

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Dos Santos, A. M., Amaral, V. S., Brandão, P., Paz, F. A. A., Rocha, J., Ferreira, L. P., Godinho, M., Volkova, O., & Vasiliev, A. (2005). Singlet ground state determined by isolated Cu2+ chain topology in microporous Na2Cu2Si4O112H2O and Na2Cu2Si4O11. Physical Review B - Condensed Matter and Materials Physics, 72(9), Article 092403. https://doi.org/10.1103/PhysRevB.72.092403

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title = "Singlet ground state determined by isolated Cu2+ chain topology in microporous Na2Cu2Si4O112H2O and Na2Cu2Si4O11",

abstract = "The copper silicate Na2Cu2Si4O112H2O and its dehydrated form Na2Cu2Si4O11 exhibit a singlet ground state at low temperature, which is conditioned by the topology of the isolated edge-sharing CuO6 (or CuO5) chains. The structural analysis of the hydrated and dehydrated forms indicates a strong alternation of the exchange interaction parameter within these chains. The magnetic susceptibility and specific heat measurements confirm spin gaps Δ=96K for Na2Cu2Si4O112H2O and Δ=85K for Na2Cu2Si4O11. The reversible dehydration of the water molecules from the microporous framework in the structure affords unique opportunity for tuning the magnetic interaction parameters in these compounds.",

author = "{Dos Santos}, {Ant{\'o}nio Moreira} and Amaral, {Vitor S.} and Paula Brand{\~a}o and Paz, {Filipe A.Almeida} and Jo{\~a}o Rocha and Ferreira, {Liliana P.} and Margarida Godinho and Olga Volkova and Alexander Vasiliev",

year = "2005",

month = sep,

day = "1",

doi = "10.1103/PhysRevB.72.092403",

language = "English",

volume = "72",

journal = "Physical Review B - Condensed Matter and Materials Physics",

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T1 - Singlet ground state determined by isolated Cu2+ chain topology in microporous Na2Cu2Si4O112H2O and Na2Cu2Si4O11

AU - Dos Santos, António Moreira

AU - Amaral, Vitor S.

AU - Brandão, Paula

AU - Paz, Filipe A.Almeida

AU - Rocha, João

AU - Ferreira, Liliana P.

AU - Godinho, Margarida

AU - Volkova, Olga

AU - Vasiliev, Alexander

PY - 2005/9/1

Y1 - 2005/9/1

N2 - The copper silicate Na2Cu2Si4O112H2O and its dehydrated form Na2Cu2Si4O11 exhibit a singlet ground state at low temperature, which is conditioned by the topology of the isolated edge-sharing CuO6 (or CuO5) chains. The structural analysis of the hydrated and dehydrated forms indicates a strong alternation of the exchange interaction parameter within these chains. The magnetic susceptibility and specific heat measurements confirm spin gaps Δ=96K for Na2Cu2Si4O112H2O and Δ=85K for Na2Cu2Si4O11. The reversible dehydration of the water molecules from the microporous framework in the structure affords unique opportunity for tuning the magnetic interaction parameters in these compounds.

AB - The copper silicate Na2Cu2Si4O112H2O and its dehydrated form Na2Cu2Si4O11 exhibit a singlet ground state at low temperature, which is conditioned by the topology of the isolated edge-sharing CuO6 (or CuO5) chains. The structural analysis of the hydrated and dehydrated forms indicates a strong alternation of the exchange interaction parameter within these chains. The magnetic susceptibility and specific heat measurements confirm spin gaps Δ=96K for Na2Cu2Si4O112H2O and Δ=85K for Na2Cu2Si4O11. The reversible dehydration of the water molecules from the microporous framework in the structure affords unique opportunity for tuning the magnetic interaction parameters in these compounds.

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DO - 10.1103/PhysRevB.72.092403

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SN - 1098-0121

VL - 72

JO - Physical Review B - Condensed Matter and Materials Physics

JF - Physical Review B - Condensed Matter and Materials Physics

IS - 9

M1 - 092403

ER -

Singlet ground state determined by isolated Cu2+ chain topology in microporous Na2Cu2Si4O112H2O and Na2Cu2Si4O11

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