High-pressure phase diagram of ${\mathrm{NdFeAsO}}_{0.9}{\mathrm{F}}_{0.1}$: Disappearance of superconductivity on the verge of ferromagnetism from Nd moments

High-pressure phase diagram of ${NdFeAsO}_{0.9} F_{0.1}$ : Disappearance of superconductivity on the verge of ferromagnetism from Nd moments

M. Abdel-Hafiez, M. Mito, K. Shibayama, S. Takagi, M. Ishizuka, A. N. Vasiliev, C. Krellner, and H. K. Mao

Phys. Rev. B 98, 094504 – Published 4 September 2018

Abstract

We investigated transport and magnetic properties of single crystal ${NdFeAsO}_{0.9} F_{0.1}$ under hydrostatic pressures up to 50 GPa. The ambient pressure superconductivity at $T_{c} \sim$ 45.4 K was fully suppressed at $P_{c} \sim 21$ GPa. Upon a further increase of pressure, ferromagnetism associated with the order of the rare-earth subsystem was induced at the border of superconductivity. Our finding is supported by the hysteresis in the magnetization $M (H$ ) loops and the strong increase in the field cooled data $M (T$ ) toward low temperatures. We also show that the temperature evolution of the electrical resistivity as a function of pressure is consistent with a crossover from a Fermi liquid to non-Fermi liquid to Fermi liquid. The Hall measurements suggest that the multiband electronic structures have changed with pressure, which should also affect the resistivity behavior. These results give access to the high-pressure side of the superconducting phase diagram in the 1111 type of materials.

Received 22 January 2018
Revised 1 July 2018

DOI:https://doi.org/10.1103/PhysRevB.98.094504

Physics Subject Headings (PhySH)

Phase diagrams Pressure effects Superconductivity

Pnictides Superconductors

Condensed Matter, Materials & Applied Physics

Authors & Affiliations

M. Abdel-Hafiez^1,2,3,*, M. Mito⁴, K. Shibayama⁴, S. Takagi⁴, M. Ishizuka⁵, A. N. Vasiliev^3,6,7, C. Krellner², and H. K. Mao¹

¹Center for High Pressure Science and Technology Advanced Research, Beijing, 100094, China
²Institute of Physics, Goethe University Frankfurt, D-60438 Frankfurt/M, Germany
³National University of Science and Technology (MISiS), Moscow 119049, Russia
⁴Graduate School of Engneering, Kyushu Institute of Technology, Fukuoka 804-8550, Japan
⁵Renovation Center of Instruments for Science Education and Technology, Osaka University, Osaka 560-0043, Japan
⁶Moscow State University, Moscow 119991, Russia
⁷National Research South Ural State University, Chelyabinsk 454080, Russia

^*mahmoudhafiez@gmail.com

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Vol. 98, Iss. 9 — 1 September 2018

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Figure 1
(a) The $T$ dependence of the in-plane resistance measurements upon heating the ${NdFeAsO}_{1 - x} F_{x}$ single crystals at $x$ = 0 and 0.1. (b) In-plane electrical resistivity $ρ$ versus temperature between 1.6 and 19.4 GPa. The inset is a closeup of the low-temperature region, highlighting the SC transition. (c) The $T$ dependence of the resistivity curves at pressures between 22.9 and 50 GPa. The insets of (a) and (c) images of the ${NdFeAsO}_{0.9} F_{0.1}$ sample mounted in a diamond anvil cell at 1.6 and 50 GPa, respectively.
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Figure 2
(a) The temperature dependence of the dc-susceptibility components measured in dc field with an amplitude of 30 Oe. The data were collected upon warming in different dc magnetic fields after cooling in a zero magnetic field. The inset illustrates a photograph of the detection coil. The inside of the main coil [20 turns, marked as (1)] with no bobbin was cone shaped. The compensation coil [20 turns, marked as (2)], covered with Stycast No. 2850FT, was located around the main coil, forming a concentric gradiometer [45]. (b) The magnetic field dependence of the isothermal magnetization $M$ vs $H$ loops were measured at different pressures at 2 K, which is consistent with a standard hysteresis loop for ferromagnets. The inset depicts the magnetic field dependence of the isothermal magnetization $M$ vs $H$ loops measured at 2 K up to 7 T with the field parallel to the $c$ axis.
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Figure 3
Pressure-temperature ( $P − T$ ) phase diagram of ${NdFeAsO}_{0.9} F_{0.1}$ . Pressure dependence of the SC transition temperatures $T_{c} s$ and a contour color plot of the normal-state resistivity exponent $n$ up to 50 GPa. The temperature dependence of $n$ are extracted from $ρ (T)$ = $ρ_{0} + A T^{n}$ for each pressure. The pink region illustrates that the temperature dependence of $n$ between $1.5 \leq n \leq 1.75$ . The values of $T_{c}^{onset}$ , $T_{c}^{zero}$ , $T_{c}^{FM}$ , and $T_{c}^{χ}$ were determined from the high-pressure resistivity and dc magnetic susceptibility. Above $P_{c}$ , local ferromagnetic order from the Nd moments appear, observed in resistivity and susceptibility. The area above the FM regime is obtained from the blue arrows in Figs. 4. The inset illustrates the pressure dependence of the Hall coefficient $R_{H}$ , and $ρ_{300 K}$ . $R_{H}$ is extracted from the transverse resistivity $ρ_{x y}$ ; see below Fig. 5.
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Figure 4
(a) The resistivity data at different magnetic fields under 45 GPa. The magnetic field broadens the magnetic transition; it also slightly increases the FM transition. (b) $T$ dependence of the derivative of the resistivity $d ρ$ / $d T$ up to 50 Gpa. (c)–(k) Resistivity as a function of $T^{n}$ for different $P$ values. $n$ is the power determined from the single power-law fit to the resistivity as a function of $T$ presented in (l). The straight solid line in each panel is the linear fit. (m) The parameter $A$ is obtained by fitting the normal state resistivity data below 80 K using this formula: $ρ (T)$ = $ρ_{0} + A T^{n}$ .
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Figure 5
(a) Zero-field cooled at 10 KOe presents the temperature-dependent inverse magnetic susceptibility. (b) Semilogarithmic plot of the low-temperature susceptibility. Black lines are the linear fit as follows: $M$ / $H \sim {log}_{10} T$ , which illustrates signature non-Fermi-liquid behavior. The data are shifted vertically for clarity. (c) The field dependence of Hall resistivity $ρ_{x y} (H$ ) of the ${NdFeAsO}_{0.9} F_{0.1}$ single crystal at pressures up to 20.5 GPa at 60 K. Hall coefficient $R_{H}$ extracted from the transverse resistivity $ρ_{x y}$ . The pressure dependence of the Hall coefficient, defined as the field derivative of $ρ_{x y} (H$ ), $R_{H} \sim ρ_{x y} (H$ )/ $d H$ , as the slope of a linear fitting to $ρ_{x y} (H$ ) is presented in the inset of Fig. 3.
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Physical Review B

covering condensed matter and materials physics

High-pressure phase diagram of ${NdFeAsO}_{0.9} F_{0.1}$ : Disappearance of superconductivity on the verge of ferromagnetism from Nd moments

M. Abdel-Hafiez, M. Mito, K. Shibayama, S. Takagi, M. Ishizuka, A. N. Vasiliev, C. Krellner, and H. K. Mao

Phys. Rev. B 98, 094504 – Published 4 September 2018

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Physical Review B

covering condensed matter and materials physics

High-pressure phase diagram of NdFeAsO0.9F0.1: Disappearance of superconductivity on the verge of ferromagnetism from Nd moments

M. Abdel-Hafiez, M. Mito, K. Shibayama, S. Takagi, M. Ishizuka, A. N. Vasiliev, C. Krellner, and H. K. Mao

Phys. Rev. B 98, 094504 – Published 4 September 2018

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High-pressure phase diagram of ${NdFeAsO}_{0.9} F_{0.1}$ : Disappearance of superconductivity on the verge of ferromagnetism from Nd moments