Magnetic Behavior of Mn3GaC under High Magnetic Field and High Pressure

Kamishima, K.; Bartashevich, M.I.; Goto, T.; Kikuchi, Makoto; Kanomata, T.

doi:10.1143/jpsj.67.1748

Cited by 42 publications

(48 citation statements)

References 19 publications

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“…In the zero magnetic field, a decreases with decreasing temperature from 330 K in the P phase, and then it rapidly decreases below T C in the F phase. This negative volume magnetostriction is consistent with the previous reports for Mn 3 Ga 1Àx Al x C with x ¼ 0, 0.03, and 0.05. 1,2,4,6) With further decreasing temperature, the shrinkage of a becomes less steep below T I{F .…”

Section: Resultssupporting

confidence: 93%

“…4 and 5, no abrupt lattice expansion occurs until 80 K from higher temperature under a magnetic field of 4 T. According to the high-field magnetization data reported by Kamishima et al, the I phase is clearly distinguished from the F phase even under a high magnetic field of 17 T for Mn 3 Ga xÀ1 Al x C (0 x 0:05). [3][4][5]17) Furthermore, the T AF{I transition temperature decreases with increasing a magnetic fields, suggesting that the I phase becomes to be stable by applying magnetic field. Therefore, our structural result indicates that a field-induced magnetic phase transition from the AF to I phases occurs for 80 < T < 130 K. In addition, we found that a in the F and AF phases slightly decreases by applying magnetic field, though a in the I phase is not affected by magnetic field.…”

Section: Resultsmentioning

confidence: 99%

“…3,4) The substitution of Al for Ga in Mn 3 GaC reduces the volume and also induces the I phase in Mn 3 Ga 1Àx Al x C (0 < x 0:1). The transition temperatures vary with depending on the Al content.…”

Section: Introductionmentioning

confidence: 99%

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X-ray Powder Diffraction Studies of Mn3Ga0.97Al0.03C in Magnetic Fields

et al. 2006

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We have performed the X-ray powder diffraction measurements for Mn 3 Ga 0:97 Al 0:03 C with a perovskite-type structure in the temperature range from 8 to 320 K in magnetic fields up to 5 T, in order to investigate the structural properties affected by the magnetic field. The compound has a successive magnetic phase transition below 160 K: the ferromagnetic (F)-intermediate (I)-antiferromagnetic (AF) phases for cooling process. The lattice parameter a abruptly increases by 0.23%, accompanied by the transition from the I to AF phases at T AF{I ¼ 130 K. In addition, we clearly observed that magnetic field induces the I phase with small a and suppresses the AF phase with large a below T AF{I .

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Section: Resultssupporting

confidence: 93%

Section: Resultsmentioning

confidence: 99%

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X-ray Powder Diffraction Studies of Mn3Ga0.97Al0.03C in Magnetic Fields

et al. 2006

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“…Firstly, it undergoes a second order transformation from a paramagnetic (PM) state to a ferromagnetic (FM) state at T C ∼ 249K followed by another second order transformation to a canted ferromagnetic state (CFM) at T ∼ 164K. Finally the material undergoes a volume discontinuous first order magnetic transformation to an an antiferromagnetic (AFM) state at T ∼ 160K [8,9]. Concentration of carbon plays a vital role in inducing the first order magnetic transformation.…”

Section: Introductionmentioning

confidence: 99%

Effect of carbon content on magnetostructural properties of Mn3GaC

Dias

Priolkar

Nigam

2014

Journal of Magnetism and Magnetic Materials

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Effect of carbon content on magnetostructural transformation in antiperovskites of the type Mn 3 GaC x (x = 0.8, 1.0 and 1.05) has been investigated. It is found that, increase in carbon content changes the ground state from ferromagnetic metallic (x = 0.8) to antiferromagnetic semiconducting (x = 1.05) type. This has been attributed to localization of itinerant Mn 3d electrons due to increased Mn3d -C2p hybridization. Such a hybridization strengthens Mn-C-Mn antiferromagnetic interactions over Mn-Mn ferromagnetic interactions. Further, magnetic field can be used as a tool to modulate the relative strengths of these ferromagnetic and antiferromagnetic interactions thereby affecting the nature and strength of magnetocaloric properties.

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“…The Mn moments in the AF and F states are 1.8 M B at 4.2 K and 1.2 M B at 170 K, respectively, [3] and T c ¼ 250 K [2]. By applying pressure, there appears an intermediate(I) magnetic state between the AF and F states [2,4]. In the F state of Mn 3 GaC at 170 K the magnetization M increases with pressure P at a rate of d ln M=dP ¼ þ2:5 Â 10 À3 kbar [4], which is in contrast to the decrease of magnetization in usual itinerant magnets.…”

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confidence: 99%