Journal
ACTA PHYSICA POLONICA A
Volume 115, Issue 5, Pages 925-930Publisher
POLISH ACAD SCIENCES INST PHYSICS
DOI: 10.12693/APhysPolA.115.925
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Magnetic properties of Pb[Cu(SO4)(OH)(2)] (linarite) natural single crystals were studied by magnetization and specific heat measurements. The angular dependences of magnetization were revealed which correlated with the regularities of the crystal structure. At about 2.8 K this quasi-one-dimensional Heisenberg system undergoes a phase transition to the long-range antiferromagnetic order with antiparallel magnetic moments aligned probably along the b-axis. The antiferromagnetic order is evidenced by the metamagnetic transition and pronounced lambda-type anomaly at T-N in the specific heat. Using phenomenological modeling based on a quantum transfer-matrix method, we argue that at higher temperatures linarite is a quasi-one-dimensional system with competing ferromagnetic nearest-neighbor and antiferromagnetic next-nearest-neighbor exchange interactions.
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