The <i>T</i>-<i>p</i>-<i>H</i> phase diagram of metallic quantum ferromagnets
· Invited
Abstract
Studies of the temperature-pressure (T-p) phase diagram of metallic quantum ferromagnets have revealed that ferromagnetic quantum criticality is avoided in two ways [1]: either the transition becomes of the first-order at a tricritical point before being suppressed such as in UGe2 [2,3], or a transition to modulated magnetic phases appear such as in LaCrGe3 [4]. We have shown that the addition of a magnetic field (H) can restore quantum criticality at the end of “wings” in the T-p-H phase diagram in both UGe2 and LaCrGe3 [5]. Our careful study of the “wings” near the tricritical point reveal new rules that apply to the T-p-H phase diagram [6]. We discuss our experimental T-p-H phase diagrams of UGe2, LaCrGe3, and CeTiGe3 and how these compounds illustrate different strength of quantum fluctuations based on recent theoretical results [7].
[1] M. Brando et al. Rev. Mod. Phys., 88, 025006 (2016).
[2] V. Taufour et al. Phys. Rev. Lett. 105, 217201 (2010).
[3] H. Kotegawa et al. J. Phys. Soc. Jpn., 80, 8, 083703 (2011).
[4] V. Taufour et al. Phys. Rev. Lett. 117, 037207 (2016).
[5] U. S. Kaluarachchi et al. Nature Communications 8, 546 (2017).
[6] V. Taufour et al. Phys. Rev. B 94 060410 (2016).
[7] Belitz et al. arXiv:1708.00103 (2017)
[1] M. Brando et al. Rev. Mod. Phys., 88, 025006 (2016).
[2] V. Taufour et al. Phys. Rev. Lett. 105, 217201 (2010).
[3] H. Kotegawa et al. J. Phys. Soc. Jpn., 80, 8, 083703 (2011).
[4] V. Taufour et al. Phys. Rev. Lett. 117, 037207 (2016).
[5] U. S. Kaluarachchi et al. Nature Communications 8, 546 (2017).
[6] V. Taufour et al. Phys. Rev. B 94 060410 (2016).
[7] Belitz et al. arXiv:1708.00103 (2017)
*Most experimental results I will present were obtained at the Iowa State University and the Ames Laboratory, US DOE, under Contract No. DE-AC02-07CH11358. This work was supported by the Materials Sciences Division of the Office of Basic Energy Sciences of the U.S. Department of Energy. Valentin Taufour w
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Presenters
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Valentin Taufour
- Univ of California - Davis