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Thermal expansion and pressure effect in MnWO4

机译:MnWO4中的热膨胀和压力效应

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MnWO4 has attracted attention because of its ferroelectric property induced by frustrated helical spin order. Strong spin-lattice interaction is necessary to explain ferroelectricity associated with this type of magnetic order. We have conducted thermal expansion measurements along the a, b, c axes revealing the existence of strong anisotropic lattice anomalies at T-1 = 7.8 K, the temperature of the magnetic lock-in transition into a commensurate low-temperature (reentrant paraelectric) phase. The effect of hydrostatic pressure up to 1.8GPa on the FE phase is investigated by measuring the dielectric constant and the FE polarization. The low-temperature commensurate and paraelectric phase is stabilized and the stability range of the ferroelectric phase is diminished under pressure. (c) 2007 Elsevier B.V. All rights reserved.
机译:MnWO4由于受挫的螺旋自旋序诱导的铁电特性而引起了人们的关注。强烈的自旋-晶格相互作用是解释与这种磁性顺序相关的铁电所必需的。我们已经沿着a,b,c轴进行了热膨胀测量,揭示出在T-1 = 7.8 K时存在强各向异性晶格异常,磁锁定温度转变为相应的低温(折返顺电)相。 。通过测量介电常数和FE极化,研究了高达1.8GPa的静水压力对FE相的影响。在压力下,低温相称和顺电相稳定,铁电相的稳定范围减小。 (c)2007 Elsevier B.V.保留所有权利。

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