TY - JOUR

T1 - Neutron experiments on antiferromagnetic nuclear order in silver at picokelvin temperatures

AU - Tuoriniemi, J.T.

AU - Nummila, K.K.

AU - Vuorinen, R.T.

AU - Lounasmaa, O.V.

AU - Metz, A.

AU - Siemensmeyer, K.

AU - Steiner, M.

AU - Lefmann, K.

AU - Clausen, K.N.

AU - Rasmussen, F.B.

PY - 1995

Y1 - 1995

N2 - Spontaneous long-range nuclear antiferromagnetic order in the spin-1/2 system of silver nuclei was observed by neutron diffraction on a single crystal of Ag-109. A structure with the ordering vector k = (2 pi/a) (0,0,1) developed when the antiferromagnetic state was entered by adiabatic demagnetization along the [001] axis. No domains of the other two symmetry-equivalent k vectors, (2 pi/a) (0,1,0) and (2 pi/a) (1,0,0), formed during warmup in zero field. Nuclear susceptibility and entropy were found by neutron transmission. In B = 0, the critical entropy of ordering was S-c = (0.54 +/- 0.03)R ln2.

AB - Spontaneous long-range nuclear antiferromagnetic order in the spin-1/2 system of silver nuclei was observed by neutron diffraction on a single crystal of Ag-109. A structure with the ordering vector k = (2 pi/a) (0,0,1) developed when the antiferromagnetic state was entered by adiabatic demagnetization along the [001] axis. No domains of the other two symmetry-equivalent k vectors, (2 pi/a) (0,1,0) and (2 pi/a) (1,0,0), formed during warmup in zero field. Nuclear susceptibility and entropy were found by neutron transmission. In B = 0, the critical entropy of ordering was S-c = (0.54 +/- 0.03)R ln2.

KW - Materialer med særlige fysiske og kemiske egenskaber

U2 - 10.1103/PhysRevLett.75.3744

DO - 10.1103/PhysRevLett.75.3744

M3 - Journal article

VL - 75

SP - 3744

EP - 3747

JO - Physical Review Letters

JF - Physical Review Letters

SN - 0031-9007

IS - 20

ER -