Magnetocaloric Effects and the Angular Variation of the Magnetic Phase Diagram of Antiferromagnetic GdAl<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:msub><mml:mrow><mml:mi mathvariant="normal">O</mml:mi></mml:mrow><mml:mrow><mml:mn>3</mml:mn></mml:mrow></mml:msub></mml:mrow></mml:math>

Blazey, K. W.; Rohrer, H.; Webster, Ronald L.

doi:10.1103/physrevb.4.2287

Cited by 110 publications

(28 citation statements)

References 30 publications

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“…Due to its presence the spin flop field H c in FeF, decreases substantially with 100-increasing temperature. A behaviour similar to this prediction, although not so pronounced, has been experimentally observed in GdAlO, (Blazey et al 1971), which has a single-ion anisotropy, not as intense as the one in FeF,.…”

Section: (5)supporting

confidence: 78%

Interaction of pulse-periodic XeCl laser radiation with metals

Arutyunyan¹,

Bolshov²,

Borisov³

et al. 1990

Sov. J. Quantum Electron.

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Section: (5)supporting

confidence: 78%

Interaction of pulse-periodic XeCl laser radiation with metals

Arutyunyan¹,

Bolshov²,

Borisov³

et al. 1990

Sov. J. Quantum Electron.

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“…Continuous SF transitions are well-known in antiferromagnets when the magnetic field is applied at an angle to the easy axis: Typically, a SF cross-over occurs when the angle between the field and the staggered moment exceeds a certain critical value (20,21). This case has been well-studied in uniaxial antiferromagnets such as GdAlO 3 (20) and MnF 2 (21).…”

mentioning

confidence: 99%

“…This case has been well-studied in uniaxial antiferromagnets such as GdAlO 3 (20) and MnF 2 (21). In the former, the critical angle starts from zero at T N = 3.2 K and grows as the temperature is lowered, reaching 10 • at zero temperature.…”

mentioning

confidence: 99%

Observation of a multiferroic critical end point

Kim

Haam

et al. 2009

Proc. Natl. Acad. Sci. U.S.A.

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The study of abrupt increases in magnetization with magnetic field known as metamagnetic transitions has opened a rich vein of new physics in itinerant electron systems, including the discovery of quantum critical end points with a marked propensity to develop new kinds of order. However, the electric analogue of the metamagnetic critical end point, a "metaelectric" critical end point, has been rarely studied. Multiferroic materials wherein magnetism and ferroelectricity are cross-coupled are ideal candidates for the exploration of this novel possibility using magnetic-field (H) as a tuning parameter. Herein, we report the discovery of a magnetic-fieldinduced metaelectric transition in multiferroic BiMn 2 O 5 , in which the electric polarization (P) switches polarity along with a concomitant Mn spin-flop transition at a critical magnetic field H c . The simultaneous metaelectric and spin-flop transitions become sharper upon cooling but remain a continuous cross-over even down to 0.5 K. Near the P = 0 line realized at μ 0 H c ≈18 T below 20 K, the dielectric constant (ε) increases significantly over wide field and temperature (T ) ranges. Furthermore, a characteristic powerlaw behavior is found in the P(H) and ε(H) curves at T = 0.66 K. These findings indicate that a magnetic-field-induced metaelectric critical end point is realized in BiMn 2 O 5 near zero temperature. T he term "critical end point" refers to a singular point in the phase diagram of matter at the end of a first order phase line, as for example, the liquid-gas critical point of water. The importance of this special point for broad classes of matter has rapidly increased in recent years (1, 2). Not only can it provide large thermal fluctuations as a necessary ingredient for displaying universal power-law of physical quantities, but in the special case where the phase transition is suppressed to zero temperature, it can give rise to intense quantum mechanical fluctuations with a marked propensity to develop instabilities into new kinds of ground state. The latter case has been recently realized in itinerant metamagnets such as Sr 3 Ru 2 O 7 (3) and URu 2 Si 2 (4). These developments motivate a parallel search for a metaelectric critical end point. By analogy with magnetism, one might expect sudden cross-overs in electric polarization in the vicinity of a metaelectric critical endpoint to be a rather general phenomenon in (anti)ferroelectric materials under application of an electric field (E). However, to date, such metaelectric transitions induced by electric fields have been limitedly observed in specific systems such as relaxor ferroelectrics (5) and DyVO 4 with the Jahn-Teller structural distortion (6). One possible reason for the scarcity of the phenomenon is the practical difficulty of applying the large voltages required ( 1 kV) without inducing electrical breakdown. Magnetic fields may in fact be better candidates for inducing metaelectric transitions, because they not only avoid the problem of electrical breakdown but also provide a reversi...

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“…106 The Neel temperature is rathe r high , '~~ 38°K~~7 implying strong exchange interactions. The magnetic fields r eq u i r e d to achieve the me t amagn etic t r a n s i t i o n are in the range of 150 kOe-180 kOe , 10 ' 108 which are beyond the range availab le to many laboratories . Another diffi culty with this material is that synthetic sing le crystals have not been available hence natural crystals of sideri te have been used in the exp e r i m e n t s .…”

Section: Fecomentioning

confidence: 99%

“…This work was published in a Physical Review Letter (Ref. 10) and it will be the subject of part of an invited talk by the principal investigator at the…”

mentioning

confidence: 99%

Cooperative Properties of Metamagnetic Materials.

Wolf¹

1976

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Magnetocaloric Effects and the Angular Variation of the Magnetic Phase Diagram of Antiferromagnetic GdAlO3

Cited by 110 publications

References 30 publications

Interaction of pulse-periodic XeCl laser radiation with metals

Interaction of pulse-periodic XeCl laser radiation with metals

Observation of a multiferroic critical end point

Cooperative Properties of Metamagnetic Materials.

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