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Magnetic Field Tuning of Magnetic- and Structure-Phase Transition in Mn2V2O7 Crystals
The Journal of Physical Chemistry C ( IF 3.3 ) Pub Date : 2022-03-07 , DOI: 10.1021/acs.jpcc.2c00171 Li-Da Chen 1, 2 , Li-Huai Shu 2, 3 , Gan Liu 2, 3 , Pan Nie 4 , Ye Shao 2 , Ye-Cheng Luo 3 , Yang-Yang Lv 2, 3 , Hao-Min Lu 1, 2 , Zeng-Wei Zhu 4 , Xiao-Xiang Xi 2, 3 , Jian Zhou 1, 2 , Feng-Zhen Huang 2, 3 , Zhen-Xiang Cheng 5 , Shu-Hua Yao 1, 2 , Y. B. Chen 2, 3 , Yan-Feng Chen 1, 2, 6
The Journal of Physical Chemistry C ( IF 3.3 ) Pub Date : 2022-03-07 , DOI: 10.1021/acs.jpcc.2c00171 Li-Da Chen 1, 2 , Li-Huai Shu 2, 3 , Gan Liu 2, 3 , Pan Nie 4 , Ye Shao 2 , Ye-Cheng Luo 3 , Yang-Yang Lv 2, 3 , Hao-Min Lu 1, 2 , Zeng-Wei Zhu 4 , Xiao-Xiang Xi 2, 3 , Jian Zhou 1, 2 , Feng-Zhen Huang 2, 3 , Zhen-Xiang Cheng 5 , Shu-Hua Yao 1, 2 , Y. B. Chen 2, 3 , Yan-Feng Chen 1, 2, 6
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Transition metal–vanadium oxides Mn2V2O7 have recently attracted much interest due to its rich structural and magnetic phase transition. However, the systematic studies on the effects of magnetic field (H) on these phase transitions are still not available. Here, based on the high-quality Mn2V2O7 crystals, the effects of the magnetic field on its phase transitions were systematically studied. When applied H is aligned along the [110] direction of β-Mn2V2O7, there is a spin-flop transition at low temperature (<17 K). The magnetic field–temperature magnetic phase diagram is proposed. In addition, the magneto-crystalline anisotropic energy of Mn2V2O7 shows the unconventional “dome-like” feature, reaching its maximum at 11 K, which may be related to the commensurate–incommensurate magnetic phase transition determined by neutron scattering previously. At the martensitic transformation around 270 K, 1 T H aligned along the [110] direction can induce the 1–2 K temperature shift of martensitic transformation, simultaneously leading to a cusp-like dielectric constant change (the maximum magneto-dielectric effect ∼ −18%). Transition-temperature shift induced by H can be quantitatively understood by thermodynamic Clausius–Clapeyron relation. These results substantiate that the magnetic field has pronounced effects on the phase transition in Mn2V2O7.
中文翻译：
Mn2V2O7 晶体中磁相变和结构相变的磁场调谐
过渡金属-钒氧化物 Mn 2 V 2 O 7最近由于其丰富的结构和磁性相变而引起了极大的兴趣。然而，关于磁场（H）对这些相变的影响的系统研究仍然不可用。在这里，基于高质量的Mn 2 V 2 O 7晶体，系统地研究了磁场对其相变的影响。当应用H沿β-Mn 2 V 2 O 7的[110]方向排列时，在低温（<17 K）下存在自旋触发器转变。提出了磁场-温度磁相图。此外，Mn 2 V 2 O 7的磁晶各向异性能量显示出非常规的“圆顶状”特征，在 11 K 时达到最大值，这可能与之前由中子散射确定的相称-不相称的磁相变有关. 在 270 K 附近的马氏体相变处，沿 [110] 方向排列的 1 T H可以引起马氏体相变的 1-2 K 温度变化，同时导致尖点状介电常数变化（最大磁介电效应 ∼ - 18%）。H引起的转变温度变化可以通过热力学克劳修斯-克拉佩龙关系来定量理解。这些结果证实磁场对Mn 2 V 2 O 7的相变具有显着影响。
更新日期：2022-03-07
中文翻译：
Mn2V2O7 晶体中磁相变和结构相变的磁场调谐
过渡金属-钒氧化物 Mn 2 V 2 O 7最近由于其丰富的结构和磁性相变而引起了极大的兴趣。然而，关于磁场（H）对这些相变的影响的系统研究仍然不可用。在这里，基于高质量的Mn 2 V 2 O 7晶体，系统地研究了磁场对其相变的影响。当应用H沿β-Mn 2 V 2 O 7的[110]方向排列时，在低温（<17 K）下存在自旋触发器转变。提出了磁场-温度磁相图。此外，Mn 2 V 2 O 7的磁晶各向异性能量显示出非常规的“圆顶状”特征，在 11 K 时达到最大值，这可能与之前由中子散射确定的相称-不相称的磁相变有关. 在 270 K 附近的马氏体相变处，沿 [110] 方向排列的 1 T H可以引起马氏体相变的 1-2 K 温度变化，同时导致尖点状介电常数变化（最大磁介电效应 ∼ - 18%）。H引起的转变温度变化可以通过热力学克劳修斯-克拉佩龙关系来定量理解。这些结果证实磁场对Mn 2 V 2 O 7的相变具有显着影响。
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