Specific heat study of spin-structural change in pyrochlore Nd${}_2$Mo${}_2$O${}_7$

Abstract

By measurements of specific heat, we have investigated the magnetic field ($H$) induced spin-structural change in Nd${}_2$Mo${}_2$O${}_7$ that shows spin-chirality-related magneto-transport phenomena. A broad peak around 2 K caused by the ordering of 2-in 2-out structure of the Nd moments at zero $H$ shifts to the lower temperature ($T$) up to around 3 T and then to the higher $T$ above around 3 T with increasing $H$ for all the direction of $H$. This is due to the crossover from antiferromagnetic to ferromagnetic arrangement between the Nd and Mo moments. While the peak $T$ increases monotonically above 3 T for $H$//[100], another peak emerges around 0.9 K at 12 T for $H$//[111], which is ascribed to the ordering of 3-in 1-out structure. For $H$//[110], a spike like peak is observed at around 3 T, which is caused perhaps by some spin flip transition.

5 pages, 4 figures

References in corpus (4)

• Spin Ice State in Frustrated Magnetic Pyrochlore Materials
• Magnetic anisotropy of the spin ice compound Dy2Ti2O7
• Specific Heat of Kagome Ice in the Pyrochlore Oxide Dy2Ti2O7
• Ferromagnetic Ising Spin Chains Emerging from the Spin Ice under Magnetic Field

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• Investigation of the magnetic structure and crystal field states of pyrochlore antiferromagnet Nd2Zr2O7
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• Anatomy of Topological Surface States: Exact Solutions from Destructive Interference on Frustrated Lattices
• Studies of the Anomalous Hall Effect and Magnetic Structure of Nd2Mo2O7 -Test of the Chirality Mechanism-
• Ordered spin-ice state in the geometrically frustrated metallic-ferromagnet Sm2Mo2O7
• Magnetic ordering of the RE lattice in REFeAsO: the odd case of Sm. A specific heat investigation in high magnetic field