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Field dependence of magnetic ordering in the frustrated XY magnet Cs[sub 2] CoCl[sub 4].

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Title: Field dependence of magnetic ordering in the frustrated XY magnet Cs[sub 2] CoCl[sub 4].
Authors: Kenzelmann, M., Coldea, R., Tennant, D.A., Visser, D., Hofmann, M., Smeibidl, P., Tylczynski, Z.
Source: Applied Physics A: Materials Science & Processing. Dec2002 Supplement, Vol. 74 Issue 6, ps901. 1p.
Subjects: Magnets, Spin excitations
Abstract: Low-dimensional magnets with low-spin quantum number are ideal model systems for investigating strongly interacting macroscopic quantum ground states and their nonlinear spin excitations. We present single-crystal neutrondiffraction measurements of the ordered phase of the quasione-dimensional spin-½ XY antiferromagnet Cs[sub 2]CoCl[sub 4] both in zero field and in fields up to 6.5 T. In zero field the system shows long-range order below T[sub N] = 217 mK with a commensurate ordering wave-vector (0, 0.5, 0.5). With increasing magnetic field — applied perpendicular to the magnetic chain axis — the magnetic Bragg peak intensities increase monotonically, reaching a maximum at H = 1.4 T; evidence that the magnetic field suppresses quantum fluctuations in the ground state. At H[sub c] = 2.1 T the ordered structure collapses in an apparent first-order phase transition, with no magnetic Bragg peaks being observed in the (0, k, l) scattering plane above this field. This result suggests that the magnetic field induces a phase transition to a spin-liquid ground state. Magnetic Bragg peak intensities at ferromagnetic positions increase quadratically up to about 2.8 T, corresponding to a linear increase of the magnetic moment. At higher magnetic fields, the intensity increases linearly up to 6.5 T. [ABSTRACT FROM AUTHOR]
Copyright of Applied Physics A: Materials Science & Processing is the property of Springer Nature and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)
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  Data: Field dependence of magnetic ordering in the frustrated XY magnet Cs[sub 2] CoCl[sub 4].
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  Data: <searchLink fieldCode="AR" term="%22Kenzelmann%2C+M%2E%22">Kenzelmann, M.</searchLink><br /><searchLink fieldCode="AR" term="%22Coldea%2C+R%2E%22">Coldea, R.</searchLink><br /><searchLink fieldCode="AR" term="%22Tennant%2C+D%2EA%2E%22">Tennant, D.A.</searchLink><br /><searchLink fieldCode="AR" term="%22Visser%2C+D%2E%22">Visser, D.</searchLink><br /><searchLink fieldCode="AR" term="%22Hofmann%2C+M%2E%22">Hofmann, M.</searchLink><br /><searchLink fieldCode="AR" term="%22Smeibidl%2C+P%2E%22">Smeibidl, P.</searchLink><br /><searchLink fieldCode="AR" term="%22Tylczynski%2C+Z%2E%22">Tylczynski, Z.</searchLink>
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  Data: <searchLink fieldCode="JN" term="%22Applied+Physics+A%3A+Materials+Science+%26+Processing%22">Applied Physics A: Materials Science & Processing</searchLink>. Dec2002 Supplement, Vol. 74 Issue 6, ps901. 1p.
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  Data: Low-dimensional magnets with low-spin quantum number are ideal model systems for investigating strongly interacting macroscopic quantum ground states and their nonlinear spin excitations. We present single-crystal neutrondiffraction measurements of the ordered phase of the quasione-dimensional spin-½ XY antiferromagnet Cs[sub 2]CoCl[sub 4] both in zero field and in fields up to 6.5 T. In zero field the system shows long-range order below T[sub N] = 217 mK with a commensurate ordering wave-vector (0, 0.5, 0.5). With increasing magnetic field — applied perpendicular to the magnetic chain axis — the magnetic Bragg peak intensities increase monotonically, reaching a maximum at H = 1.4 T; evidence that the magnetic field suppresses quantum fluctuations in the ground state. At H[sub c] = 2.1 T the ordered structure collapses in an apparent first-order phase transition, with no magnetic Bragg peaks being observed in the (0, k, l) scattering plane above this field. This result suggests that the magnetic field induces a phase transition to a spin-liquid ground state. Magnetic Bragg peak intensities at ferromagnetic positions increase quadratically up to about 2.8 T, corresponding to a linear increase of the magnetic moment. At higher magnetic fields, the intensity increases linearly up to 6.5 T. [ABSTRACT FROM AUTHOR]
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  Data: <i>Copyright of Applied Physics A: Materials Science & Processing is the property of Springer Nature and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract.</i> (Copyright applies to all Abstracts.)
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