Magnetic properties of incommensurate antiferromagnet β-KMnCl3

Fedoseeva, N. V.; Velikanova, Т. Ya.; Balaev, A. D.

doi:10.1016/0038-1098(84)90816-0

Cited by 7 publications

(3 citation statements)

References 4 publications

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“…The discontinuity [13][14][15] in the low-T magnetization at H ≈ 0.4 H S was shown by Nikuni and Shiba 16,17 to be a novel, fluctuationinduced phase transition from the umbrella structure (optimal at small H due to a small, easy-plane anisotropy 18 in the intrachain exchange) to a coplanar structure (optimal at larger H due to quantum fluctuations). Further experiments [19][20][21][22][23] , including neutron-diffraction 24 and specific-heat measurements 12 near T N , confirmed their analysis.…”

Section: Introductionmentioning

confidence: 99%

Quantum fluctuations in the incommensurate phase ofCsCuCl3in a transverse magnetic field

Nikuni

Jacobs

1998

Phys. Rev. B

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In low magnetic field, the stacked, triangular antiferromagnet CsCuCl 3 has a helical structure incommensurate (IC) in the chain direction. The IC wavenumber (from neutron-diffraction experiments) decreases with increasing field transverse to the chains, as predicted by classical theory, but then it has a plateau almost certainly caused by quantum fluctuations. Linear spinwave theory fails because fluctuations have particularly large effects in the IC phase. An innovative phenomenological treatment of quantum fluctuations yields a plateau at approximately the observed value and the observed fields; it predicts a transition to the commensurate phase so far not observed. Results depend sensitively on a weak anisotropy. 64.70.Rh, 75.10.Jm, 75.25.+z, 75.50.Ee

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Section: Introductionmentioning

confidence: 99%

Quantum fluctuations in the incommensurate phase ofCsCuCl3in a transverse magnetic field

Nikuni

Jacobs

1998

Phys. Rev. B

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“…The reciprocal susceptibility 1 /~ for T > 99 K obeys the Curie-Weiss law with a Curie constant C = 1.99 x lo-' emu/g and a Weiss temperature 8 = -224 K. These values are [19]. The effective magnetic moment of peff = 6 .…”

Section: Rbmnclsmentioning

confidence: 93%

Magnetic properties in XMnCl₃ (X = Na, K, Rb, and Cs) single crystals

Lim

Choh

Jeong

1996

Physica Status Solidi (b)

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The magnetic ordering (N6el) temperatures for XMnCl3 (X = Na, K, Rb, and Cs) single crystals grown by the Czochralski method have been investigated in the paramagnetic and antiferromagnetic regions by employing a superconducting quantum interference device magnetometer. From thew results, the N6el temperatures are (5.3f0.2) K for NaMnCl3, ( 9 4 f 3) K for KhlnClj, (99 f 1) K for RbMnC13, and (85 f 5) K for CsMnClj.

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“…In longitudinal magnetic field (normal to the planes, parallel to the IC wavenumber q), the low-temperature magnetization is discontinuous 3,12,13 at H ≈ 0.4H S , due to a novel, fluctuation-induced phase transition 14,15 : the umbrella structure is optimal at small H (due to a small, easy-plane anisotropy in the interplane exchange 16 ) and a coplanar structure is optimal at larger H (due to quantum fluctuations). Other experiments [17][18][19][20][21][22][23][24] support the Nikuni-Shiba analysis 14,15 .…”

Section: Introductionmentioning

confidence: 99%

Fluctuation-induced phase in in a transverse magnetic field: theory

Jacobs

Nikuni

1998

J. Phys.: Condens. Matter

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CsCuCl 3 is a quantum triangular antiferromagnet, ferromagnetically stacked, with an incommensurate (IC) structure due to a DzyaloshinskiiMoriya interaction. Because of the classical degeneracy caused by the frustration, fluctuations in CsCuCl 3 have extraordinarily large effects, such as the phase transition in longitudinal magnetic field (normal to the planes, parallel to the IC wavenumber q) and the plateau in q in transverse field (perpendicular to q). We argue that fluctuations are responsible also for the new IC phase discovered in transverse field near the Néel temperature T N , by T. Werner et al. [Solid State Commun. 102, 609 (1997)]. We develop and analyse the corresponding minimal Landau theory; the effects of fluctuations on the frustration are included phenomenologically, by means of a biquadratic term. The Landau theory gives two IC phases, one familiar from previous studies; properties of the new IC phase, which occupies a pocket of the temperature-field phase diagram near T N , agree qualitatively with those of the new phase found experimentally. 64.70.Rh, 75.10.Jm, 75.25.+z, 75.50.Ee

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Magnetic properties of incommensurate antiferromagnet β-KMnCl3

Cited by 7 publications

References 4 publications

Quantum fluctuations in the incommensurate phase ofCsCuCl3in a transverse magnetic field

Quantum fluctuations in the incommensurate phase ofCsCuCl3in a transverse magnetic field

Magnetic properties in XMnCl₃ (X = Na, K, Rb, and Cs) single crystals

Fluctuation-induced phase in in a transverse magnetic field: theory

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Magnetic properties of incommensurate antiferromagnet β-KMnCl3

Cited by 7 publications

References 4 publications

Quantum fluctuations in the incommensurate phase ofCsCuCl3in a transverse magnetic field

Quantum fluctuations in the incommensurate phase ofCsCuCl3in a transverse magnetic field

Magnetic properties in XMnCl3 (X = Na, K, Rb, and Cs) single crystals

Fluctuation-induced phase in in a transverse magnetic field: theory

Contact Info

Product

Resources

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Magnetic properties in XMnCl₃ (X = Na, K, Rb, and Cs) single crystals