Magnetic, transport, and thermodynamic properties of<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:msub><mml:mrow><mml:mtext>CaMn</mml:mtext></mml:mrow><mml:mn>2</mml:mn></mml:msub><mml:msub><mml:mtext>O</mml:mtext><mml:mn>4</mml:mn></mml:msub></mml:mrow></mml:math>single crystals

White, B. D.; Souza, J. A.; Chiorescu, Corneliu; Neumeier, J. J.; Cohn, J. L.

doi:10.1103/physrevb.79.104427

Cited by 23 publications

(20 citation statements)

References 41 publications

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“…The wave vectors associated with the order parameters of these two phases can become locked to one another between the two transition temperatures. 29 The interaction of the two order parameters in CuO is further complicated by the phase transition temperature separation of only 0.6 K. In practice, critical behavior is observed in magnetic systems 24,31 when the reduced temperature t ≡ (T − T N )/T N is within the range 10 −1 |t| 10 −3 . Thus, 094420-3 for CuO it is certain that the region where the critical behavior associated with the phase transition at T N2 occurs extends well into the region of critical behavior associated with the phase transition at T N3 and vice versa.…”

Section: Resultsmentioning

confidence: 99%

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Multiple phase transitions in CuO observed with thermal expansion

et al. 2013

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High-resolution thermal-expansion measurements of single-crystalline CuO (tenorite) are reported for the temperature range 5 < T < 350 K. The data reveal three transitions (T N1 = 213 K, T N2 = 229.2 K, and T N3 = 229.8 K), which corroborate the recently proposed magnetic phase diagram [Villarreal, Quirion, Plumer, Poirier, Usui, and Kimura, Phys. Rev. Lett. 109, 167206 (2012)] revealing three distinct antiferromagnetic (AFM) phases. Analysis of the region surrounding T N2 and T N3 suggests that these phase transitions are continuous and yields estimates for the heat-capacity critical exponents of α T N2 = 0.033(2) and α T N3 = 0.040(9). Magnetic susceptibility measurements reveal spin-flop transitions at temperatures below T N1 , confirming that the b axis is the easy AFM axis.

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Section: Resultsmentioning

confidence: 99%

“…24,31 The subscripts + and − for each parameter denote the values of the parameters above (+) and below (−) the phase transition temperature. Since C * P exhibits excellent overlap with λ T , Eq.…”

Section: Resultsmentioning

confidence: 99%

Multiple phase transitions in CuO observed with thermal expansion

et al. 2013

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“…significantly from other layered oxides such as -Mo 4 O 11 , ␥-Mo 4 O 11 , Li 0.9 Mo 6 O 17 , and CaMn 2 O 4 where ⌬L / L 300 reveals strongly anisotropic behavior and, in some cases, shows negative thermal expansion along one or two crystallographic directions 11,[14][15][16]. The general magnitude of ⌬L / L 300 and the thermal-expansion coefficient = d͑⌬L / L 300 ͒ / dT ͑seeFig.…”

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confidence: 92%

Physical properties of quasi-one-dimensionalSrNbO3.41and Luttinger liquid analysis of electrical transport

et al. 2010

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We report the diagonal components of the electrical resistivity tensor of quasi-one-dimensional SrNbO 3.41 , determined using the Montgomery method. The results confirm quasi-one-dimensional behavior but show a smaller anisotropy than previously reported. High-resolution linear thermal expansion reveals weakly anisotropic behavior and no evidence of charge-density wave formation, which has been suspected as the cause of the upturn in the electrical resistivity near 50 K. Heat-capacity measurements reveal an electronic heatcapacity coefficient that is near zero with a Debye temperature ⌰ D = 382͑1͒ K. We report that exhibits power-law behavior, as expected within the framework of Luttinger liquid theory for quasi-one-dimensional systems. Detailed analysis of the data above 100 K implies relatively strong correlations and the possibility of a gap in the spin-excitation spectrum. The origin of the small energy gap below 50 K and the conduction mechanism in this region remain as outstanding issues.

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“…The thermal expansion for T T N is negative, which is similar to other magnetically ordered elements like Cr, Ce, and Gd, and alloys like Invar Fe 0.65 Ni 0. 35 . This negative thermal expansion is probably related to the volume dependence of the magnetic exchange interactions.…”

Section: Discussionmentioning

confidence: 95%

Thermal expansion and thermodynamic characterization of antiferromagnetic phase transition in elementalα-Mn

White

Bollinger

Neumeier

2014

Phys. Status Solidi B

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High‐resolution measurements of thermal expansion and specific heat have been performed on α‐Mn. An analysis of these thermodynamic properties, with particular emphasis on their behavior in the temperature region near the Néel temperature, TN = 101.4(2) K, suggests that the antiferromagnetic phase transition is continuous (second order within the Ehrenfest classification scheme). The thermal expansion for T≲TN is negative, which is probably related to the volume dependence of the magnetic exchange interactions. This is manifested in the negative pressure derivative normaldTN/normaldP and may also be related to the anomalously low reported values of the bulk modulus for α‐Mn. Large, negative values of the bulk Grüneisen function, γG, for T< 75 K are comparable to those of antiferromagnetic Cr. In each case, the magnetic contribution to γG dominates for T≤TN.

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Magnetic, transport, and thermodynamic properties ofCaMn2O4single crystals

Cited by 23 publications

References 41 publications

Multiple phase transitions in CuO observed with thermal expansion

Multiple phase transitions in CuO observed with thermal expansion

Physical properties of quasi-one-dimensionalSrNbO3.41and Luttinger liquid analysis of electrical transport

Thermal expansion and thermodynamic characterization of antiferromagnetic phase transition in elementalα-Mn

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