### Abstract

The magnetic properties of Na2CuP2O7 were investigated by means of P-31 nuclear magnetic resonance (NMR), magnetic susceptibility, and heat capacity measurements. We report the 31P NMR shift, the spin-lattice (1/T-1), and spin spin (1/T-2) relaxation rate data as a function of temperature T. The temperature dependence of the NMR shift K(T) is well described by the S = 1/2 square lattice Heisenberg antiferromagnetic model with an intraplanar exchange of J/k(B) similar or equal to 18 +/- 2 K and a hyperfine coupling A = 3533 +/- 185 Oe/mu B. The P-31 NMR spectrum was found to broaden abruptly below T similar to 10 K, signifying some kind of transition. However, no anomaly was noticed in the bulk susceptibility data down to 1.8 K. The heat capacity appears to have a weak maximum around 10 K. With decrease in temperature, the spin-lattice relaxation rate 1/T-1 decreases monotonically and appears to agree well with the high temperature series expansion expression for a S = 1/2 2D square lattice.

Original language | English |
---|---|

Pages (from-to) | 4285-4294 |

Number of pages | 10 |

Journal | Journal of Physics: Condensed Matter |

Volume | 18 |

DOIs | |

Publication status | Published - 2006 |

### Keywords

- NUCLEAR MAGNETIC-RELAXATION
- QUANTUM ANTIFERROMAGNETS
- GROUND-STATES
- SUSCEPTIBILITY
- LA2CUO4
- KCUF3

### Cite this

^{31}P NMR study of Na

_{2}CuP

_{2}O

_{7}: an S = 1/2 two dimensional Heisenberg antiferromagnetic system.

*Journal of Physics: Condensed Matter*,

*18*, 4285-4294. https://doi.org/10.1088/0953-8984/18/17/015

** ^{31}P NMR study of Na_{2}CuP_{2}O_{7}: an S = 1/2 two dimensional Heisenberg antiferromagnetic system.** / Nath, R.; Mahajan, A. V.; Büttgen, N.; Kegler, Christian; Hemberger, J.; Loidl, A.

Research output: Contribution to journal › Article

^{31}P NMR study of Na

_{2}CuP

_{2}O

_{7}: an S = 1/2 two dimensional Heisenberg antiferromagnetic system',

*Journal of Physics: Condensed Matter*, vol. 18, pp. 4285-4294. https://doi.org/10.1088/0953-8984/18/17/015

^{31}P NMR study of Na

_{2}CuP

_{2}O

_{7}: an S = 1/2 two dimensional Heisenberg antiferromagnetic system. Journal of Physics: Condensed Matter. 2006;18:4285-4294. https://doi.org/10.1088/0953-8984/18/17/015

}

TY - JOUR

T1 - 31P NMR study of Na2CuP2O7: an S = 1/2 two dimensional Heisenberg antiferromagnetic system

AU - Nath, R.

AU - Mahajan, A. V.

AU - Büttgen, N.

AU - Kegler, Christian

AU - Hemberger, J.

AU - Loidl, A.

PY - 2006

Y1 - 2006

N2 - The magnetic properties of Na2CuP2O7 were investigated by means of P-31 nuclear magnetic resonance (NMR), magnetic susceptibility, and heat capacity measurements. We report the 31P NMR shift, the spin-lattice (1/T-1), and spin spin (1/T-2) relaxation rate data as a function of temperature T. The temperature dependence of the NMR shift K(T) is well described by the S = 1/2 square lattice Heisenberg antiferromagnetic model with an intraplanar exchange of J/k(B) similar or equal to 18 +/- 2 K and a hyperfine coupling A = 3533 +/- 185 Oe/mu B. The P-31 NMR spectrum was found to broaden abruptly below T similar to 10 K, signifying some kind of transition. However, no anomaly was noticed in the bulk susceptibility data down to 1.8 K. The heat capacity appears to have a weak maximum around 10 K. With decrease in temperature, the spin-lattice relaxation rate 1/T-1 decreases monotonically and appears to agree well with the high temperature series expansion expression for a S = 1/2 2D square lattice.

AB - The magnetic properties of Na2CuP2O7 were investigated by means of P-31 nuclear magnetic resonance (NMR), magnetic susceptibility, and heat capacity measurements. We report the 31P NMR shift, the spin-lattice (1/T-1), and spin spin (1/T-2) relaxation rate data as a function of temperature T. The temperature dependence of the NMR shift K(T) is well described by the S = 1/2 square lattice Heisenberg antiferromagnetic model with an intraplanar exchange of J/k(B) similar or equal to 18 +/- 2 K and a hyperfine coupling A = 3533 +/- 185 Oe/mu B. The P-31 NMR spectrum was found to broaden abruptly below T similar to 10 K, signifying some kind of transition. However, no anomaly was noticed in the bulk susceptibility data down to 1.8 K. The heat capacity appears to have a weak maximum around 10 K. With decrease in temperature, the spin-lattice relaxation rate 1/T-1 decreases monotonically and appears to agree well with the high temperature series expansion expression for a S = 1/2 2D square lattice.

KW - NUCLEAR MAGNETIC-RELAXATION

KW - QUANTUM ANTIFERROMAGNETS

KW - GROUND-STATES

KW - SUSCEPTIBILITY

KW - LA2CUO4

KW - KCUF3

U2 - 10.1088/0953-8984/18/17/015

DO - 10.1088/0953-8984/18/17/015

M3 - Article

VL - 18

SP - 4285

EP - 4294

JO - Journal of Physics: Condensed Matter

JF - Journal of Physics: Condensed Matter

SN - 0953-8984

ER -