High-pressure magnetic state of MnP probed by means of muon-spin rotation

Abstract

We report a detailed µSR study of the pressure evolution of the magnetic order in the manganese based pnictide MnP, which has been recently found to undergo a superconducting transition under pressure once the magnetic ground state is suppressed. Using the muon as a volume sensitive local magnetic probe, we identify a ferromagnetic state as well as two incommensurate helical states (with propagation vectors Q aligned along the crystallographic c− and b−directions, respectively) which transform into each other through first order phase transitions as a function of pressure and temperature. Our data appear to support that the magnetic state from which superconductivity develops at higher pressures is an incommensurate helical phase.

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“…neglect contact hyperfine contributions. Similar differences were found, e.g., in La 2 CuO 4 [35], RFeAsO (R = La, Ce, Pr, and Sm) [36], Ba 1−x K x Fe 2 As 2 [29], Ba 1−x Na x Fe 2 As 2 [30], MnP [37,38], etc.…”

Putative helimagnetic phase in the kagome metal Co_3Sn_2-xIn_xS_2

“…3) which is characterised by minimum (B min ) and maximum (B max ) cutoff fields (see Fig. 2b), which is consistent with the incommensurate helimagnetic order, observed in MnSi [28][29][30] and MnP [31,32]. The cutoff fields B min and B max are measures of the magnetic order parameter of the helimagnetic state.…”

“…The field distribution for the samples x ≥ 0.3 presented in Figure 1b is characterized by a minimum (B min ) and a maximum (B max ) cutoff field, which is consistent with the incommensurate helimagnetic order, and is well described by the field distribution given by [28][29][30][31][32]:…”

Exceedingly small moment itinerant ferromagnetism of single crystalline La5Co2Ge3

“…9) this is not all surprising and the presence of multiple muon sites is often observed (see, e.g., Refs. [27][28][29] and references therein). The following functional form was used:…”